Purchase and Sale Agreement - America Online Inc., ANS Communications Inc., and WorldCom Inc.


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                          PURCHASE AND SALE AGREEMENT

                                        

                                  BY AND AMONG

                                        

                             AMERICA ONLINE, INC.,

                                        

                            ANS COMMUNICATIONS, INC.

                                      AND

                                 WORLDCOM, INC.


                                        

                                  DATED AS OF

                                        

                               SEPTEMBER 7, 1997
                                        

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                               TABLE OF CONTENTS
                                        

ARTICLE I THE PURCHASE AND SALE..............................................  2

 1.1 Purchase and Sale.......................................................  2
 1.2 The Closing.............................................................  2
 1.3 Exchange of Consideration...............................................  2
 1.4 Delayed Assets and Liabilities..........................................  3
 1.5 CompuServe Transitional Matters.........................................  4
 1.6 ANS Transitional Matters................................................  7
 1.7 Employee Severance Obligations..........................................  9
 1.8 Allocation of Consideration.............................................  9
 1.9 Treatment of ANS and AOL Options........................................ 10
 1.10 Treatment of CompuServe Options........................................ 11
 1.11 Treatment of CompuServe Options........................................ 11

ARTICLE II ASSET TRANSFER; SETTLEMENT OF INTERCOMPANY ACCOUNTS............... 11

 2.1 Transfer of Assets...................................................... 11
 2.2 Intercompany Accounts................................................... 12
 2.3 Release of Claims....................................................... 12

ARTICLE III REPRESENTATIONS AND WARRANTIES REGARDING AOL AND ANS............. 13

 3.1 Organization, Existence and Good Standing............................... 13
 3.2 ANS Capital Stock Ownership of ANS Entities; Investments................ 13
 3.3 Ownership of ANS Entities' Capital Stock; Investments................... 13
 3.4 Power and Authority; Non-Contravention; Filings and Consents............ 14
 3.5 Financial Information................................................... 15
 3.6 Subsequent Events....................................................... 16
 3.7 Legal Proceedings....................................................... 17
 3.8 Contracts............................................................... 17
 3.9 Accounts Receivable..................................................... 19
 3.10 Taxes.................................................................. 19
 3.11 Employee Benefit Plans; Employment Matters............................. 20
 3.12 Compliance with Laws; Permits.......................................... 22
 3.13 Patents, Trademarks, Etc............................................... 23
 3.14 No Assets Held by AOL or AOL Entities.................................. 24
 3.15 Labor Matters.......................................................... 24
 3.16 Insurance.............................................................. 24
 3.17 Commissions and Fees................................................... 25
 3.18 Real Property.......................................................... 25

ARTICLE IV REPRESENTATIONS AND WARRANTIES REGARDING WORLDCOM................. 25

 4.1 Organization, Existence and Good Standing............................... 25
 4.2 Power and Authority; Non-Contravention; Filings and Consents............ 25

 
 4.3 Legal Proceedings...................................................... 26
 4.4 No Vote Required....................................................... 27
 4.5 Investment Representation.............................................. 27
 4.6  CompuServe Agreement.................................................. 27
 4.7 Title to CompuServe Assets............................................. 27
 4.8 Representations Relating to CompuServe Assets.]........................ 27
 4.9 CompuServe Power and Authority; Non-Contravention; Filing and
     Consents............................................................... 27

ARTICLE V COVENANTS......................................................... 28

 5.1 Interim Conduct of ANS and each ANS Entity and the ANS Network
     Services Business...................................................... 28
 5.2 Indemnification........................................................ 31
 5.3 No Contribution........................................................ 35
 5.4 Access to Information.................................................. 35
 5.5 Confidentiality........................................................ 35
 5.6 HSR Act Compliance, Etc................................................ 36
 5.7 Public Disclosures..................................................... 36
 5.8 Resignation of Directors and Officers.................................. 36
 5.9 Notification of Certain Matters........................................ 36
 5.10 No Solicitation....................................................... 37
 5.11 Other Actions......................................................... 38
 5.12 Cooperation........................................................... 38
 5.13 ANS and ANS Network Services Business Employees....................... 38
 5.14 ANS Name.............................................................. 39
 5.15 CompuServe Name....................................................... 39
 5.16 Noncompetition and Nonsolicitation Agreement.......................... 40
 5.17 Key-Employee Nondisclosure and Nonsolicitation Agreements............. 40
 5.18 Board Seat............................................................ 40
 5.19 Services Agreements................................................... 40
 5.20 Status of Title to the CompuServe Assets.............................. 40
 5.21 Delivery of ANS Shares................................................ 40
 5.22 Consummation of Merger................................................ 40
 5.23 Covenants Relating to CompuServe Online Services Business............. 40
 5.24 Exercise of Option; Negotiation Period................................ 41

ARTICLE VI TAX MATTERS...................................................... 41

 6.1 Section 338 Election................................................... 41
 6.2 Tax Indemnification.................................................... 43
 6.3 Tax Related Adjustments................................................ 47
 6.4 Transfer Taxes......................................................... 49

ARTICLE VII CONDITIONS TO CLOSING........................................... 49

 7.1 Mutual Conditions...................................................... 49
 7.2 Conditions to Obligations of WorldCom.................................. 49
 7.3 Conditions to Obligations of AOL and ANS............................... 51

                                       ii

 
ARTICLE VIII TERMINATION, AMENDMENT AND WAIVER.............................. 52

 8.1 Termination............................................................ 52
 8.2 Effect of Termination.................................................. 53
 8.3 Amendment.............................................................. 53
 8.4 Waiver................................................................. 53
 8.5 Expenses............................................................... 53

ARTICLE IX MISCELLANEOUS.................................................... 54

 9.1 Representations and Warranties; Survival............................... 54
 9.2 Notices................................................................ 54
 9.3 Governing Law and Dispute Resolution................................... 55
 9.4 Specific Performance................................................... 56
 9.5 Severability........................................................... 56
 9.6 Financial Information.................................................. 56
 9.7 Captions............................................................... 56
 9.8 Entire Agreement....................................................... 56
 9.9 Counterparts........................................................... 56
 9.10 Binding Effect; Assignability......................................... 57
 9.11 No Rule of Construction............................................... 57
 9.12 Schedules............................................................. 57

ARTICLE X DEFINITIONS....................................................... 57

                                      iii

 
                                    EXHIBITS


EXHIBIT A        FORM OF BILL OF SALE
EXHIBIT B        FORM OF ASSIGNMENT AND ASSUMPTION AGREEMENT
EXHIBIT C        COST ALLOCATION AND INTER-COMPANY SERVICE ARRANGEMENTS
EXHIBIT D        AGREEMENT TO FORM BUSINESS ENTITY
EXHIBIT E        NONCOMPETITION AND NONSOLICITATION AGREEMENT
EXHIBIT F        KEY EMPLOYEE AGREEMENTS
EXHIBIT G        TRANSITION SERVICES AGREEMENT
EXHIBIT H        NETWORK SERVICES AGREEMENT 1
EXHIBIT I        NETWORK SERVICES AGREEMENT 2


                            SCHEDULES OF ANS AND AOL
                                        
Schedule 1.6     Retention Bonuses
Schedule 1.7(a)  Severance Arrangements
Schedule 1.9     Options Convertible into Securities of ANS
Schedule 2.1     Transfer of Assets
Schedule 2.2     Intercompany Accounts As of June 30, 1997
Schedule 2.3(a)  Release Of  Claims  (Release By AOL)
Schedule 2.3(b)  Release Of Claims (Release By WorldCom)
Schedule 3.2(a)  Issued Capital Stock
Schedule 3.2(b)  Liens And Encumbrances On ANS Stock
Schedule 3.2(c)  Outstanding Options And Warrants
Schedule 3.3(a)  Ownership Of ANS Entities' Stock
Schedule 3.3(b)  Capital Stock Of Other Entities
Schedule 3.4(a)  Consents And Waivers
Schedule 3.5     ANS Financial Statements
Schedule 3.6     Subsequent Events
Schedule 3.7     Legal Proceedings
Schedule 3.8(a)  Contracts (General)
Schedule 3.8(b)  Contracts (Certain Terms)
Schedule 3.8(c)  Contracts (International Distributors)
Schedule 3.8(d)  Agreements with Ten Largest Customers (Excluding AOL)
Schedule 3.8(e)  Contracts (Government Contracts)
Schedule 3.8(f)  Contracts (Consents)
Schedule 3.10    Tax Disclosure (General)
Schedule 3.10(g) Tax Disclosure (Tax Sharing Agreements)
Schedule 3.11(a) Employee Benefit Plans
Schedule 3.11(b) Unions; Effects Of Agreement
Schedule 3.12    Compliance With Laws; Permits
Schedule 3.13    Patents, Trademarks, Etc.
Schedule 3.14    Certain Rights Held By AOL Entities
Schedule 3.18    Real Estate
Schedule 5.1(d)  Interim Conduct -- Specified Contracts
Schedule 5.1(e)  Interim Conduct -- Employees
Schedule 5.1(h)  Interim Conduct -- Material Transactions
Schedule 5.1(l)  Interim Conduct -- Related Party Transactions
Schedule 5.13    Interim Conduct -- ANS Employment Matters
Schedule 7.3(f)  Lease Guarantees
Schedule 10.1    ANS Excluded Assets

                                       iv

 
Schedule 10.2    ANS Network Assets
Schedule 10.5    CompuServe Excluded Assets
Schedule 10.6    Excluded Liabilities

                             SCHEDULES OF WORLDCOM

Schedule 4.3     Legal Proceedings
Schedule 10.3(b) Pro Forma CompuServe Balance Sheet
Schedule 10.4    CompuServe Liabilities

                                       v

 
                          PURCHASE AND SALE AGREEMENT

          THIS PURCHASE AND SALE AGREEMENT (this "Agreement") is made and
entered into as of the 7th day of September, 1997, by and among AMERICA ONLINE,
INC., a Delaware corporation ("AOL"), ANS COMMUNICATIONS, INC., a Delaware
corporation and a wholly-owned subsidiary of AOL ("ANS"), and WORLDCOM, INC., a
Georgia corporation ("WorldCom").  ANS and AOL are sometimes referred to herein
as the "Selling Entities."  All capitalized terms used in this Agreement and not
defined in the text hereof have the meanings set forth in Article X.

                              W I T N E S S E T H:

          WHEREAS, WorldCom is a party to an Agreement and Plan of Merger (the
"CompuServe Agreement") of even date herewith, pursuant to which it has agreed
to acquire CompuServe Corporation, a Delaware corporation ("CompuServe"),
through a merger (the "Merger") with WorldCom Acquisition Company, L.L.C.
("WAC"), which is wholly owned by WorldCom;

          WHEREAS, AOL is the record and beneficial owner of all of the issued
and outstanding common shares, par value $.01 per share, and preferred shares,
par value $.01 per share, of ANS (the "ANS Shares");

          WHEREAS, the Boards of Directors of AOL, ANS and WorldCom each have
determined that it is in the best interests of their respective stockholders
that they enter into this Agreement, which provides for the acquisition by
WorldCom from AOL of all of the ANS Shares (the "ANS Transfer") and the
acquisition by AOL from CompuServe Incorporated, an Ohio corporation which is a
wholly-owned subsidiary of CompuServe ("CompuServe-Ohio"), of all the right,
title and interest of CompuServe and CompuServe-Ohio in and to the CompuServe
Assets and the CompuServe Online Services Business (the "CompuServe Transfer"),
and have authorized their respective officers to execute and deliver this
Agreement on their behalf;

     WHEREAS, the Board of Directors of AOL has determined it to be in the best
interests of its stockholders to sell the ANS Shares to WorldCom, to acquire the
CompuServe Assets and the CompuServe Online Services Business and to enter into
the other transactions contemplated hereby, and has adopted resolutions
approving such matters;

     WHEREAS, the Board of Directors of WorldCom has determined it to be in the
best interests of its shareholders to cause CompuServe to transfer the
CompuServe Assets and the CompuServe Online Services Business to AOL,
immediately following the acquisition of CompuServe by WorldCom, and has adopted
a resolution approving such transfers; and

     WHEREAS, AOL, ANS and WorldCom desire to make certain representations,
warranties, covenants and agreements in connection with the transactions
contemplated by this Agreement and also to prescribe various conditions to the
consummation thereof;

 
     NOW, THEREFORE, in consideration of the premises, and the mutual
representations, warranties, covenants and agreements contained herein, the
parties hereto do hereby agree as follows:

                                   ARTICLE I

                             THE PURCHASE AND SALE

     1.1 Purchase and Sale. Upon the terms and subject to the conditions set
forth in this Agreement, at the Closing (as defined in Section 1.2):

     (a) AOL shall sell and deliver to WorldCom, or, if so directed by
WorldCom, to CompuServe, the ANS Shares free and clear of all Liens or Other
Encumbrances; and

     (b) in exchange for the ANS Shares, WorldCom shall (i) deliver or
cause CompuServe to deliver the Cash Consideration described in Section
1.3(b)(i) to AOL and  (ii) cause CompuServe-Ohio to transfer to AOL or its
designee or designees the CompuServe Assets and CompuServe Online Services
Business (subject to the CompuServe Liabilities), which AOL or such designee(s)
shall accept and assume.

The exchange of consideration described in this Section (collectively, the
"Purchase and Sale"), shall take place as more particularly described in Section
1.3.

     1.2 The Closing. Subject to the satisfaction or waiver of the conditions
set forth in Article VII, the closing of the Purchase and Sale (the "Closing")
shall take place immediately following the closing of the Merger at the offices
of Bryan Cave LLP in Washington, D.C., at 10:00 a.m., local time, or at such
other time and place as the parties hereto may agree. The day on which the
Closing takes place is referred to herein as the "Closing Date." The Closing
shall be effective at the same time as the Effective Time referred to in the
CompuServe Agreement (which effective time under this Agreement is referred to
herein as the "Effective Time").

     1.3  Exchange of Consideration.

     (a)  At the Closing, AOL shall deliver to WorldCom, or, if so directed
by WorldCom, to CompuServe, a certificate or certificates representing all of
the outstanding ANS Shares, duly endorsed or accompanied by a stock assignment
separate from certificates which shall have been duly executed in blank.

     (b) In exchange for the transfer of the ANS Shares as provided herein:

         (i) The following shall apply as to the cash consideration (the "Cash
     Consideration"):  WorldCom shall deliver or cause CompuServe to deliver to
     AOL and/or its designee or designees One Hundred Seventy-Five Million
     Dollars ($175,000,000) by wire transfer of immediately available funds at
     the Closing, to an account or accounts designated at least two Business

                                       2

 
     Days prior to the Closing Date by AOL by written notice to WorldCom,
     subject to the following adjustments: (A) the adjustment with respect to
     the AOL Unvested Stock Options as provided in Section 1.9(a), (B) the
     adjustment with respect to the WorldCom (ANS) Stock Options as provided in
     Section 1.9(b), (C) an adjustment in favor of AOL in the amount of Two
     Million Five Hundred Thousand Dollars ($2,500,000), representing a
     reimbursement of expenses incurred by AOL in connection with discussions,
     negotiations and other actions concerning the previously-contemplated
     transaction with CompuServe, and (D) an adjustment in favor of WorldCom in
     the amount of Five Million Dollars ($5,000,000) relating to amounts to be
     paid to certain employees of ANS as provided in Section 1.6(a), plus
     customary additional employer direct costs incurred by ANS resulting from
     such payments to employees such as the employer portion of FICA payments
     (but not including withholding taxes);

          (ii) WorldCom shall cause CompuServe, CompuServe-Ohio and other
     appropriate CompuServe Entities to execute and deliver to AOL and/or its
     designee or designees at the Closing a bill or bills of sale in
     substantially the form attached hereto as Exhibit A (the "Bill of Sale")
     and other appropriate instruments of transfer, pursuant to which CompuServe
     shall sell, convey, assign and deliver to AOL and/or its designee or
     designees all right, title and interest of CompuServe, CompuServe-Ohio and
     other appropriate CompuServe Entities in and to the CompuServe Assets; and

          (iii)  WorldCom shall, and shall cause CompuServe, CompuServe-Ohio and
     the other appropriate CompuServe Entities to, execute and deliver to AOL
     and/or its designee or designees at the Closing, and AOL shall execute and
     deliver to CompuServe, the appropriate CompuServe Entities and WorldCom at
     the Closing, the Assignment and Assumption Agreement in substantially the
     form attached hereto as Exhibit B (the "Assignment and Assumption
     Agreement").

     1.4  Delayed Assets and Liabilities.
 
     (a) WorldCom shall use all reasonable efforts to secure all necessary
consents and approvals in order to transfer all of the CompuServe Assets on the
Closing Date as provided herein.  However, to the extent that any such required
consent or waiver with respect to the transfer of a contract or other instrument
or obligation included in the CompuServe Assets has not been obtained on or
prior to the Closing Date, such contract or other instrument or obligation (a
"Delayed Asset") shall not be transferred hereunder if so determined by
WorldCom, and any related liability that constitutes a CompuServe Liability (a
"Delayed Liability"), shall not be assumed hereunder by AOL other than to the
extent provided herein unless and until such required consent or waiver has been
obtained. WorldCom shall advise AOL in writing, not later than the second
Business Day prior to the scheduled Closing Date, of any CompuServe Assets which
it anticipates will be Delayed Assets, and shall identify any related Delayed
Liabilities.

     (b)  If there are any Delayed Assets, WorldCom will, and will cause
CompuServe and the CompuServe Entities to, use all reasonable efforts to provide

                                       3

 
AOL with the intended benefits under or of any such Delayed Asset, and (to the
extent that AOL is so provided with the benefits thereof), AOL shall assume, pay
and perform any corresponding Delayed Liabilities.

     (c) Following the Closing, the parties shall cooperate in good faith in
order to secure any necessary consents or waivers for the transfer of any
Delayed Assets and Delayed Liabilities, or to enter into other arrangements
which will reflect as nearly as possible the respective benefits and obligations
that would have been in effect had the Delayed Assets and Delayed Liabilities
been transferred and assumed on the Closing Date.  Any out-of-pocket expenses
reasonably incurred by the parties in taking the actions referred to in this
paragraph (c) shall be paid by WorldCom.  At such time and on each occasion
after the Closing Date that a required consent or waiver shall be obtained with
respect to a Delayed Asset, such Delayed Asset shall forthwith be transferred
and assigned to AOL, and all related Delayed Liabilities shall be simultaneously
assumed by AOL hereunder, whereupon (i) such Delayed Asset shall constitute for
all purposes a CompuServe Asset acquired hereunder and (ii) such Delayed
Liabilities shall constitute for all purposes CompuServe Liabilities assumed
hereunder.  Prior to any such transfer of Delayed Assets, WorldCom shall use all
reasonable efforts to preserve and maintain the value of such Delayed Assets in
all material respects, and shall pay all liabilities which become due in respect
of such Delayed Assets prior to the transfer thereof to AOL or its designee(s).

     (d) On the earliest to occur of (i) one year following the Closing Date,
(ii) the date on which a Delayed Asset or Delayed Liability is transferred
hereunder and (iii) the time when the parties shall conclude that any Delayed
Asset or Delayed Liability will not be transferred for any reason, then WorldCom
shall, or shall cause a WorldCom Entity to, pay to AOL or its designee an amount
sufficient to compensate it for the loss incurred by it (net of the benefit
resulting from discharge of its obligation in respect of the related Delayed
Liability) resulting from such failure to transfer such Delayed Asset and
Delayed Liability, including interest on the amount of such loss from the
Closing Date to the date of payment, compounded daily, at the prime or base rate
of interest announced from time to time by NationsBank of Texas, N.A. For
purposes of this paragraph (d), the loss incurred by AOL or its designee shall
be deemed to be the excess, if any, of the value of the CompuServe Assets and
the CompuServe Online Services Business as of the Closing Date (after taking
into account the assumption of the CompuServe Liabilities) over the value of the
assets and rights actually transferred to AOL or its designee or designees
hereunder (after taking into account the CompuServe Excluded Assets).  The
determination of such value shall take into account any decrease in the overall
value of the CompuServe Assets and the CompuServe Online Services Business which
may result from the absence of or delay in delivering such Delayed Assets, but
shall not otherwise take into account any indirect or consequential damages.
Such payment by WorldCom or a WorldCom Entity shall constitute the sole remedy
of AOL and its designees in respect of the delay in delivery or failure to
deliver the applicable Delayed Assets.

     1.5 CompuServe Transitional Matters. In connection with, and in order to
facilitate the implementation of, the CompuServe Transfer, the following
transitional arrangements, requirements and adjustments shall be applicable (for
purposes of this Section 1.5, the term "CompuServe Online Services Business" for
the period of time prior to the Effective Time shall mean the business referred
to in Exhibit C hereto as "CSI"):

                                       4

 
          (a) Employees.  All employees of CompuServe-Ohio and other CompuServe
              ----------                                                       
Entities who are employed as such immediately prior to the Effective Time and
whose respective primary responsibilities are any of the following shall be
employed or offered employment, immediately after the Effective Time, by AOL or
its designee or designees:  (i)  general management of the CompuServe Online
Services Business, (ii) supporting and operating the CompuServe Online Service
Business and/or CompuServe's Sprynet business ("Sprynet") including but not
limited to content creation and hosting, (iii) general and administrative duties
in MIS, operations and billing, (iv) duties in other departments headed by the
Vice President, Technical Operations (except those primarily supporting the
electronic tax filing and rapid refund line of business), or (v) other general
and administrative duties relating to the provision of finance, administration
and legal support primarily to the CompuServe Online Services Business and/or
Sprynet.  Employees whose primary responsibilities relate substantially equally
to the CompuServe Online Service Business and/or Sprynet, on the one hand, and
other CompuServe business activities, including but not limited to network
services but excluding Sprynet, on the other hand, shall be allocated employee-
by-employee substantially equally between AOL and/or its designee or designees,
on the one hand, and CompuServe and/or any one or more of the CompuServe
Entities, on the other hand, in accordance with the process set forth in the
immediately following subsection (c).

          (b) Allocation of Facilities and Other Assets.  CompuServe-Ohio shall
              ------------------------------------------                       
transfer, or cause to be transferred by CompuServe or appropriate other
CompuServe Entities, to AOL and/or its designee or designees subject to Section
1.4, all as provided in Sections 1.3(b)(ii) and (iii), subject to related
CompuServe Liabilities, the Assets (which shall constitute CompuServe Assets)
identified in paragraphs 2, 3, 6 and 7 of that part of the memorandum attached
hereto as Exhibit C captioned "Cost Allocation and Inter-Company Service
Arrangements - CSI" and in Attachments 1 and 2 thereto.  Without limiting the
generality of the foregoing, such allocation of assets shall include the
allocation of rights under and with respect to leases of real estate and/or
tangible assets and interests in such leased real property and tangible assets.

          (c) Allocation Process.  In making the allocations provided for in the
              -------------------                                               
immediately preceding paragraphs (a) and (b), each of AOL and WorldCom shall
have equal access to the CompuServe employees and Assets who and which are the
subjects of such allocations, including rights to conduct audits.  If any
disagreement arises as to the allocation of any employee or Assets which cannot
be resolved by agreement within 10 days after either party gives notice to the
other that it disagrees with a proposed allocation, the dispute shall be
submitted to final and binding arbitration in accordance with the provisions of
this Section 1.5 and the Commercial Rules of the American Arbitration
Association before an arbitrator mutually satisfactory to AOL and WorldCom
selected by them within an additional 10 days after the giving of such notice
or, if they shall not agree on such selection, selected by an Arbiter chosen
under the procedures specified in paragraph (d)(ii) below.  The decision of such
arbitrator shall be final and binding.

                                       5

 
          (d) CompuServe Net Working Capital and Cash; Long-Term Liabilities.
              ---------------------------------------------------------------

              (i) Within 30 days after the Closing Date, AOL shall prepare and
     deliver to WorldCom a consolidated balance sheet (the "COLS Closing Date
     Balance Sheet") of the CompuServe Online Services Business, as transferred
     to AOL or its designee(s) on the Closing Date, including the CompuServe
     Assets and the CompuServe Liabilities, prepared on a basis consistent with
     the pro forma balance sheet which is attached hereto as Attachment 1 to
     Exhibit C (the "Pro Forma Balance Sheet"), which shall show, among other
     things, net current assets and net current liabilities after taking into
     account all transfers made on the Closing Date as contemplated by this
     Agreement. AOL shall confer with WorldCom with respect to the preparation
     of the COLS Closing Date Balance Sheet, and WorldCom shall have the right
     to review all work papers and supporting documentation.

              (ii) If WorldCom disputes the COLS Closing Date Balance Sheet
     delivered by AOL, WorldCom shall deliver a "Notice of Dispute" to AOL not
     more than thirty (30) days after the date WorldCom receives the COLS
     Closing Date Balance Sheet.  Upon receipt of a Notice of Dispute, AOL shall
     promptly consult with WorldCom with respect to its specified points of
     disagreement in an effort to resolve the dispute.  If any such dispute
     cannot be resolved by AOL and WorldCom within ten (10) days after AOL
     receives the Notice of Dispute, AOL and WorldCom shall refer the dispute to
     the Arbiter hereinafter referred to  who shall serve as an arbitrator to
     finally determine, as soon as practicable, all points of disagreement with
     respect to the COLS Closing Date Balance Sheet.  The Arbiter shall be a
     partner in the New York office of Price Waterhouse chosen by mutual
     agreement of the parties; provided that, if Price Waterhouse shall, at the
     time, be serving as the independent public accountants of either WorldCom
     or AOL or shall otherwise have a material relationship with either of them,
     then the Arbiter shall be a partner at the New York office of KPMG Peat
     Marwick chosen by mutual agreement of the parties and if KPMG Peat Marwick
     shall have such a material relationship, a partner at another accounting
     firm mutually satisfactory to WorldCom and AOL.  The Arbiter shall apply
     the terms of this Section and shall conduct the arbitration in New York
     City at a location or locations to be determined by the Arbiter under such
     procedures as the parties may agree or, failing such agreement, under the
     Commercial Rules of the American Arbitration Association.  The fees and
     expenses of the arbitration and the Arbiter incurred in connection with the
     arbitration of the COLS Closing Date Balance Sheet shall be allocated
     between the parties by the Arbiter in proportion to the extent either party
     did not prevail on items in dispute in the COLS Closing Date Balance Sheet,
     provided that such fees and expenses shall not include, as long as a party
     complies in all material respects with the procedures of this Section, the
     other party's outside counsel or accounting fees.  All determinations by
     the Arbiter shall be final, conclusive and binding with respect to the COLS
     Closing Date Balance Sheet and the allocation of arbitration fees and
     expenses.

              (iii)  In the event that, as of the Closing Date, (x) the
     CompuServe Online Services Business shall have working capital, calculated

                                       6

 
     as the excess, if any, of total current assets less total current
     liabilities, as shown on the COLS Closing Date Balance Sheet prepared on a
     basis consistent therewith ("Net Working Capital"), which is less than Five
     Million Dollars ($5,000,000) and/or (y) the CompuServe Online Service
     Business shall have actual cash on hand in an amount which is less than
     Fifteen Million Dollars ($15,000,000), as reflected on the COLS Closing
     Date Balance Sheet so prepared, then WorldCom or CompuServe shall pay to
     AOL an amount equal to such shortfall in Net Working Capital or cash on
     hand, as the case may be, if there shall be only one of such requirements
     which shall not have been met, or the greater of the two shortfalls if both
     of such requirements shall not have been met, by wire transfer of
     immediately available funds not more than three Business Days after the
     final determination thereof.  If both such requirements shall have been
     met, neither WorldCom nor CompuServe shall be required to make any such
     payment to AOL, and in any case AOL shall not be required to make any
     payment to WorldCom or CompuServe in respect of Net Working Capital or cash
     on hand, whether or not there shall have been, as of the Closing Date, any
     amount of Net Working Capital and/or cash on hand of the CompuServe Online
     Services Business in excess of either or both of such requirements, as
     reflected on the COLS Closing Date Balance Sheet or otherwise.

              (iv) The CompuServe Liabilities assumed by AOL shall not include
     any long-term liabilities (which, for purposes hereof, shall not include
     operating leases), as of the Closing Date as reflected on the COLS Closing
     Date Balance Sheet or otherwise.  If, notwithstanding such prohibition, any
     long-term liabilities are included with the CompuServe Online Services
     Business, WorldCom shall assume and indemnify AOL and/or its designee or
     designees from and against any and all Losses and Expenses which AOL and/or
     its designee or designees may incur as a result of or in connection
     therewith.

     1.6 ANS Transitional Matters. Similarly, in order to facilitate the
implementation of the ANS Transfer, the following transitional arrangements,
requirements and adjustments shall be applicable:

         (a) Employees.  All employees of ANS or any ANS Entity who are
             ---------                                                 
employed as such immediately prior to the Effective Time shall continue to be
employed or offered employment by ANS or such ANS Entity immediately after the
Effective Time, all as more particularly provided in Section 5.13.  At the
Closing, ANS has agreed to and shall pay retention bonuses to the employees
named on Schedule 1.6 for continued service during the period from the signing
of the AOL Agreement through the Closing.

         (b) Retention of Assets; Exceptions.  In accordance with the terms of
             -------------------------------                                  
Exhibit C hereto, ANS shall own and retain the ANS Assets, as reflected on the
ANS Closing Date Balance Sheet (as hereinafter defined), except that, for no
additional consideration other than the benefits to ANS and WorldCom under this
Agreement, (i) ANS shall grant to AOL a perpetual paid-up license to any network
management software and network software source code which it or any ANS Entity

                                       7

 
owns or has any interest in at the Effective Time and any modifications thereto
that shall have been theretofore developed internally or customized by ANS, and
ANS shall provide AOL with documentation for such software and access to key ANS
personnel for consulting services related to such software for a period of nine
months after the Effective Time on the basis of ANS's actual cost plus 10% and
(ii) ANS shall assign and transfer to AOL and/or its designee or designees all
of its rights with respect to leased equipment used for ANS's Web-caching
system, which license and leased equipment rights shall constitute ANS Excluded
Assets.  Further, after the date hereof but prior to the Effective Time, ANS
shall sell and lease back equipment which it has previously purchased and such
leases shall continue to be held by ANS after the Effective Time, it being
understood and agreed that an amount equal to the amount of any deposits paid by
AOL in connection with the purchase by ANS of such equipment will be paid by ANS
or WorldCom to AOL prior to or at the Effective Time or settled in connection
with the settlement of inter-company accounts as provided in Section 2.2.  At
the Effective Time, for no additional consideration other than the benefit to
AOL under this Agreement, AOL shall assign and transfer to ANS all of AOL's
rights under leases for modems leased to AOL for equipment operated by ANS, and
WorldCom and ANS shall assume and indemnify AOL from and against any and all
Losses and Expenses which AOL may incur after the Effective Time as a result of
or in connection therewith.

         (c) ANS Net Working Capital and Cash; Long-Term Liabilities.
             --------------------------------------------------------

             (i) Within 30 days after the Closing Date, WorldCom or ANS shall
     prepare and deliver to AOL a consolidated balance sheet of ANS and the ANS
     Entities (the "ANS Closing Date Balance Sheet"), prepared on a basis
     consistent with the June 30, 1997 balance sheet of ANS included in Schedule
     3.5, which shall show, among other things, net current assets and net
     current liabilities.  WorldCom shall confer with AOL with respect to the
     preparation of the ANS Closing Date Balance Sheet, and AOL shall have the
     right to review all work papers and supporting documentation.

             (ii) If AOL disputes the ANS Closing Date Balance Sheet delivered
     by WorldCom or ANS, AOL shall deliver a "Notice of Dispute" to WorldCom not
     more than thirty (30) days after the date AOL receives the ANS Closing Date
     Balance Sheet.  Upon receipt of a Notice of Dispute, WorldCom shall
     promptly consult with AOL with respect to its specified points of
     disagreement in an effort to resolve the dispute.  If any such dispute
     cannot be resolved by WorldCom and AOL within ten (10) days after WorldCom
     receives the Notice of Dispute, WorldCom and AOL shall refer the dispute to
     the Arbiter referred to in Section 1.5(d), who shall serve as an arbitrator
     under the procedures specified in such  Section and applying the terms of
     such Section, to finally determine, as soon as practicable, all points of
     disagreement with respect to the ANS Closing Date Balance Sheet.  All
     determinations by the Arbiter shall be final, conclusive and binding with
     respect to the ANS Closing Date Balance Sheet and the allocation of
     arbitration fees and expenses.

             (iii)  In the event that, as of the Closing Date, ANS shall have
     negative working capital (that is, an excess of current liabilities over
     current assets, as shown on the ANS Closing Date Balance Sheet, referred to
     below as "Negative Working Capital"), 

                                       8

 
     calculated after and having given effect to the payment and settlement of
     inter-company accounts as provided in Section 2.2, in excess of Thirty-Six
     Million One Hundred Thousand Dollars ($36,100,000), then AOL shall pay to
     WorldCom an amount equal to the amount by which ANS Negative Working
     Capital exceeds Thirty-Six Million One Hundred Thousand Dollars
     ($36,100,000), by wire transfer of immediately available funds not more
     than three Business Days after the final determination thereof. If ANS
     Negative Working Capital shall be equal to or less than Thirty-Six Million
     One Hundred Thousand Dollars ($36,100,000) or there shall be no Negative
     Working Capital, AOL shall not be required to make any payment to WorldCom
     in respect of Negative Working Capital.

             (iv) ANS shall not have any long-term liabilities as of the
     Closing Date (it being understood that for purposes hereof operating leases
     shall not constitute long-term liabilities), as reflected on the ANS
     Closing Date Balance Sheet or otherwise; provided that, notwithstanding
     such prohibition, if it does have any such long-term liabilities at such
     time, AOL shall assume and indemnify WorldCom and ANS from and against any
     and all Losses and Expenses which they or either of them may incur as a
     result of or in connection therewith.

     1.7. Employee Severance Obligations.
 
     (a)  AOL shall reimburse WorldCom for all severance payments and other
expenses reasonably incurred by WorldCom, in accordance with its (or AOL's)
customary employment practices, in respect of any employees of ANS or any ANS
Entity whose employment is terminated for any reason within six months following
the Closing, up to an aggregate of $25,000,000 for all such payments under this
paragraph (a).  In respect of any such employees whose employment is so
terminated within such six-month period, WorldCom shall provide them with cash
severance payments substantially equivalent to the payments they would have been
entitled to under the AOL severance policy, a copy of which is attached hereto
as Schedule 1.7(a), and they shall be entitled to participate in any other
severance benefits offered by WorldCom to its employees which correspond to
severance benefits offered to ANS employees by either AOL or ANS prior to the
Closing, and otherwise in accordance with the terms and limitations of such
WorldCom benefit programs.

     (b)  WorldCom shall reimburse AOL for all severance payments and other
expenses reasonably incurred by AOL, in accordance with its (or CompuServe's)
customary employment practices, in respect of any employees of CompuServe or any
CompuServe Entity who is a part of the CompuServe Online Services Business and
who is hired as a result of the transactions provided herein, whose employment
is terminated by AOL for any reason within six months following the Closing, up
to an aggregate of $25,000,000 for all such payments under this paragraph (b).

     1.8 Allocation of Consideration. With respect to the allocation of the
consideration exchanged pursuant to the terms of this Agreement, the parties
agree to timely file all forms required under applicable Tax law including the
forms to be filed under Code (S)1060(e).

                                       9

 
     1.9 Treatment of ANS and AOL Options. (a) At the Effective Time, WorldCom
shall cause each director, employee or consultant of ANS or any ANS Entity who
is a holder of a then-outstanding, unexercised and unvested AOL stock option
(the "AOL Unvested Stock Options") to receive, without any action on the part of
the holder thereof, options to purchase shares of WorldCom Common Stock
("WorldCom Stock Options") having the same terms and conditions as the AOL
Unvested Stock Options including such terms and conditions as may be
incorporated by reference into the agreements evidencing AOL Unvested Stock
Options pursuant to the AOL Stock Plans under which such AOL Unvested Stock
Options were granted, subject to adjustment as follows: (i) the Average Trading
Price for the AOL Common Stock shall be divided by the Average Trading Price for
the WorldCom Common Stock, and the result shall be the "Adjustment Factor"; (ii)
the exercise price applicable under each AOL Unvested Stock Option shall be
divided by the Adjustment Factor and (iii) the number of shares issuable upon
exercise shall be multiplied by the Adjustment Factor. To the extent that any of
the AOL Unvested Stock Options were incentive stock options within the meaning
of Section 422 of the Code, the WorldCom Stock Options shall also be incentive
stock options pursuant to and to the extent permitted by Section 424(a) of the
Code. WorldCom shall take all corporate action necessary to reserve for issuance
a sufficient number of shares of Common Stock of WorldCom for delivery upon the
exercise of WorldCom Stock Options after the Effective Time. Promptly after the
Effective Time, WorldCom shall file or cause to be filed all registration
statements on Form S-8 or other appropriate form as may be necessary in
connection with the purchase and sale of Common Stock of WorldCom contemplated
by such WorldCom Stock Options subsequent to the Effective Time. AOL shall pay
to WorldCom, through a reduction in the Cash Consideration, an amount equal to
50% of the Option Value of such AOL Unvested Stock Options. "Option Value"
means, for this purpose, the Average Trading Price for the WorldCom Common Stock
minus the option exercise price under the WorldCom Stock Options.

    (b) At the Effective Time, WorldCom shall cause the persons listed on
Schedule 1.9 to receive, in exchange for the then-outstanding and unexercised
options to acquire ANS shares which are listed on such Schedule, options to
purchase shares of WorldCom Common Stock ("WorldCom (ANS) Stock Options") in
exchange for such unexercised options, having the terms specified on such
Schedule and otherwise in accordance with the terms applicable to stock options
offered to other WorldCom employees under the WorldCom, Inc. 1997 Stock Option
Plan, subject to adjustment as follows: (i) the value of a share of ANS stock,
which is agreed to be $41.6410, shall be divided by the Average Trading Price
for the WorldCom Common Stock, and the result shall be the "Adjustment Factor";
(ii) the exercise price applicable under each ANS stock option shall be divided
by the Adjustment Factor and (iii) the number of shares issuable upon exercise
shall be multiplied by the Adjustment Factor.  To the extent that any such AOL
stock options were incentive stock options within the meaning of Section 422 of
the Code, the WorldCom Stock Options shall also be incentive stock options
pursuant to and to the extent permitted by Section 424(a) of the Code.  WorldCom
shall take all corporate action necessary to reserve for issuance a sufficient
number of shares of Common Stock of WorldCom for delivery upon the exercise of
WorldCom (ANS) Stock Options after the Effective Time.  Promptly after the
Effective Time, WorldCom shall file or cause to be filed all registration
statements on Form S-8 or other appropriate form as may be necessary in
connection with the purchase and sale of 

                                       10

 
Common Stock of WorldCom contemplated by such WorldCom (ANS) Stock Options
subsequent to the Effective Time. In consideration for the issuance of such
WorldCom (ANS) Stock Options, AOL shall pay to WorldCom, through a reduction in
the Cash Consideration, an amount equal to 25% of the Option Value of such
WorldCom (ANS) Stock Options. "Option Value" means, for this purpose, the
Average Trading Price of the WorldCom Common Stock minus the option exercise
price under the WorldCom (ANS) Stock Options.

     1.10 Treatment of CompuServe Options. AOL shall determine the extent to
which, and the terms on which, it may make stock options available to employees
of the CompuServe Online Services Business who are employed by AOL, whether in
exchange for existing options issued by CompuServe or otherwise, and WorldCom
shall have no liability in respect thereof. All severance and other obligations
relating to employees of the CompuServe Online Services Business (whether or not
AOL chooses to offer them employment) shall be a part of the CompuServe
Liabilities, subject to the provisions of Section 1.7.

     1.11 Adjustment Based on Material Adverse Change. If, as of the Closing,
there shall have been a Material Adverse Change with respect to the CompuServe
Online Services Business, then WorldCom shall, or shall cause a WorldCom Entity
to, pay to AOL or its designee(s), promptly following the Closing Date, an
amount sufficient to compensate it for the loss incurred by it resulting from
such Material Adverse Change. For purposes of this Section 1.11, the loss
incurred by AOL or its designee(s) shall be deemed to be the excess, if any, of
the value that the CompuServe Assets and the CompuServe Online Services Business
would have had as of the Closing Date over the value thereof after taking into
account such Material Adverse Change (and after taking into account, in each
case, any effect on the CompuServe Liabilities to be assumed by AOL or its
designee or designees as provided herein). The determination of such value after
taking into account such Material Adverse Change shall take into account any
decrease in the overall value of the CompuServe Assets and the CompuServe Online
Services Business resulting from such Material Adverse Change, but shall not
otherwise take into account any indirect or consequential damages. Such payment
by WorldCom or a WorldCom Entity shall constitute the sole remedy of AOL and its
designees in respect of the applicable Material Adverse Change referred to in
this Section 1.11.

                                   ARTICLE II

              ASSET TRANSFER; SETTLEMENT OF INTERCOMPANY ACCOUNTS

     2.1 Transfer of Assets. AOL and ANS agree that, prior to the Closing, any
ANS Network Assets, including without limitation modems, owned by or in the
possession of AOL or any AOL Entity (including shared Assets as shown on
Schedule 2.1) will be transferred and contributed for no additional
consideration to ANS in accordance with the provisions of Section 1.6; provided,
however, that such shared Assets shall not include (x) Assets held under any AOL
employee benefit plans, such as life insurance policies and deferred
compensation plans for the benefit of ANS or ANS Entity employees (provided AOL
shall remain responsible for providing any payments or other benefits accrued,
earned or vested thereunder as of the Closing), or (y) any other AOL insurance
policy (except, in the case of clauses (x) and (y), any pre-paid benefits or
coverage under insurance policies which inure to ANS or employees of ANS or any
ANS

                                       11

 
Entities and coverage with respect to such policies for accrued or past claims
or losses). In connection with such transfers, AOL agrees to use all reasonable
efforts to obtain any required consents, approvals or waivers. Subject to the
provisions of Section 7.2(b), to the extent that any such ANS Network Assets
have not been so contributed to ANS prior to or at the Closing, AOL shall, and
shall cause the other AOL Entities to, use all reasonable efforts, including
acting after the Closing and to the maximum extent permitted by law as ANS's
agent, effectuate such transfer and contribution to ANS as soon as practicable
after the Closing for no additional consideration.

     2.2 Intercompany Accounts. Immediately prior to the Closing, AOL and each
AOL Entity shall pay all amounts they then owe to ANS or any ANS Entity
(including all amounts owed to ANS pursuant to any Tax sharing agreement), and
ANS and each ANS Entity shall pay all amounts they then owe to AOL or any AOL
Entity (with offsetting amounts to be offset so that only a single net payment
shall be made between any two such parties). To the extent that any such amounts
have not been paid prior to or at the Closing, the obligor shall, as soon as
practicable following the Closing, pay all such unpaid amounts together with
interest thereon, compounded daily, at the prime or base rate of interest
announced from time to time by NationsBank of Texas, N.A. Except as set forth on
Schedule 2.2, there are no amounts owing from ANS or any ANS Entity to AOL or
any AOL Entity, or from AOL or any AOL Entity to ANS or any ANS Entity. If ANS
or an ANS Entity shall owe any such amounts to AOL or an AOL Entity at the
Closing, WorldCom shall cause the necessary funds to be advanced to ANS or such
ANS Entity to provide for such repayment as provided in this Section.

     2.3 Release of Claims. (a) Except as set forth in Schedule 2.3(a) or as
provided in Section 1.5 (including Exhibit C referred to therein), immediately
prior to the Effective Time, AOL, for itself and on behalf of each of the AOL
Entities, releases and forever discharges ANS from any and all claims, demands,
proceedings, causes of action, orders, obligations, contracts, agreements,
debts, and liabilities whatsoever, that AOL or any AOL Entity now has, has ever
had, or may hereafter have against ANS arising prior to the Effective Time or on
account of or arising out of any matter, cause, or event occurring immediately
prior to the Effective Time, including, but not limited to, any rights to
indemnification, contribution or reimbursement from ANS, and whether or not
relating to claims pending prior to, on, or asserted after, the Effective Time.
Further, AOL and each of the AOL Entities, as of the Effective Time, irrevocably
covenants to refrain from, directly or indirectly, asserting any claim or
demand, or commencing, instituting, or causing to be commenced, any proceeding
of any kind against ANS based upon any matter purported to be released hereby.

     (b)  Effective as of the Effective Time, WorldCom, for itself and on behalf
of each of the WorldCom Entities (including ANS after the Closing), releases and
forever discharges AOL from any and all claims, demands, proceedings, causes of
action, orders, obligations, contracts, agreements, debts, and liabilities
whatsoever, that WorldCom or any WorldCom Entity now has, has ever had, or may
hereafter have against AOL arising prior to the Effective Time or on account of
or arising out of any matter, cause, or event described on Schedule 2.3(b),
except for any of the foregoing which is based on a Third Party Claim; provided,
that this paragraph shall not be deemed to limit or affect the rights  of
WorldCom in respect of any Third Party Claim 

                                       12

 
pursuant to Section 5.2. Further, WorldCom and each of the WorldCom Entities, as
of the Effective Time, irrevocably covenants to refrain from, directly or
indirectly, asserting any claim or demand, or commencing, instituting, or
causing to be commenced, any proceeding of any kind against AOL based upon any
matter purported to be released hereby.

                                  ARTICLE III

              REPRESENTATIONS AND WARRANTIES REGARDING AOL AND ANS

                  AOL and ANS, jointly and severally, hereby make the following
representations and warranties to WorldCom:

                  3.1 Organization, Existence and Good Standing. AOL is a
corporation duly organized, validly existing and in good standing under the laws
of the State of Delaware. ANS is a corporation duly organized, validly existing
and in good standing under the laws of the State of Delaware. Each of ANS and
the ANS Entities is duly organized, validly existing and, to the extent such
concept is applicable under the laws of such jurisdiction, in good standing in
its respective jurisdiction of organization. Each of ANS and the ANS Entities
has all necessary corporate power and authority to own, lease and operate its
properties and to conduct its business as currently conducted. Each of ANS and
the ANS Entities is duly qualified to do business as a foreign corporation and,
to the extent such concept is applicable in such jurisdictions, is in good
standing in each jurisdiction in which the properties owned, leased or operated
by it or the nature of the business conducted by it makes such qualification
necessary, except where the failure to be so duly qualified and in good standing
would not have a Material Adverse Effect. AOL has made available to WorldCom
complete and correct copies of its, ANS's and each ANS Entity's Certificate of
Incorporation (or equivalent charter document) and Bylaws, in each case as
amended to the date of this Agreement.

     3.2 ANS Capital Stock Ownership of ANS Entities; Investments. ANS's
authorized and issued capital stock is as shown on Schedule 3.2(a). All shares
shown on such Schedule as owned by AOL have been duly authorized and validly
issued, are owned by and registered in the name of AOL, free and clear of all
Liens and Other Encumbrances except as shown on Schedule 3.2(b) (all of which
Liens or Other Encumbrances shown on such Schedule shall be released and
discharged at or prior to the Closing), and are fully paid and non-assessable.
Other than the rights created pursuant to this Agreement and except as shown on
Schedule 3.2(c), there are no options, warrants, debt securities or other
agreements, instruments or securities outstanding which are convertible into, or
which grant the holder thereof or any other person the right to acquire, any
securities of ANS.

     3.3 Ownership of ANS Entities' Capital Stock; Investments. (a) ANS owns
(directly or through one or more ANS Entities as set forth on Schedule
                                                              --------
3.3(a)(i), beneficially and (except for de minimis numbers of shares held
---------
by nominees as required by the laws of certain foreign jurisdictions) of record,
the issued and outstanding shares of capital stock or other securities of or
interests in the ANS Entities as set forth on Schedule 3.3(a)(i), all of which
                                              ------------------
shares or other securities or interests are duly authorized, validly issued and
outstanding, fully paid and non-

                                       13

 
assessable, and free and clear of all Liens or Other Encumbrances except as
shown on Schedule 3.3(a)(ii) (all of which Liens or Other Encumbrances shown on
such Schedule shall be released and discharged at or prior to the Closing). As
of the date of this Agreement, except as set forth on Schedule 3.3(a)(ii), there
                                                      -------------------
are no preemptive rights, options, warrants or similar rights granted by ANS or
any ANS Entity in respect of shares of capital stock or other securities of or
interests in the ANS Entities or any agreements to which ANS or any ANS Entity
is a party providing for the issuance or sale by ANS or any ANS Entity of
capital stock or other securities of or interests in any ANS Entity. Except as
set forth on Schedule 3.3(a)(iii), there are no outstanding debt securities,
agreements or interests of any ANS Entity, or, other instruments issued by or to
which ANS, or any ANS Entity or, to the knowledge of AOL or ANS, any other
Person is a party, entitling the holders thereof or parties thereto to vote or
to direct or otherwise restrict the vote of the holders of the capital stock or
other securities of or interests in any ANS Entity or which are convertible into
or exchangeable for capital stock or other securities of or interests in any ANS
Entity. Except as set forth on Schedule 3.3(a)(iii), no capital stock or other
securities of or interests in any ANS Entity are reserved for issuance under any
stock plans or otherwise, and there is no liability for or obligations with
respect to any dividends, distributions or similar participation rights declared
or accumulated but unpaid with respect to any securities of or interests in any
ANS Entity.

     (b) Except for the ANS Entities or as set forth on Schedule 3.3(b),
                                                        --------------- 
ANS and the ANS Entities do not own, beneficially or otherwise, any shares of
capital stock or other securities of or any direct or indirect interest of any
nature in, any other corporation, partnership, limited liability company, joint
venture or other entity.

     3.4  Power and Authority; Non-Contravention; Filings and Consents.

     (a) Each of the Selling Entities has full corporate power and authority to
execute, deliver and perform its obligations under this Agreement and all other
agreements and documents executed and delivered, or to be executed and
delivered, by it pursuant to this Agreement.  Each of the Selling Entities has
taken all action required by its respective Certificate of Incorporation and
Bylaws to authorize the execution, delivery and performance of this Agreement
and all other agreements and documents executed and delivered, or to be executed
and delivered, by it pursuant to this Agreement and the consummation of the
transactions contemplated hereby and thereby, and the approval of the
stockholders of AOL is not required in connection therewith. The execution and
delivery of this Agreement by the Selling Entities do not and (except for
consents and waivers listed on Schedule 3.4(a), all of which will be received
prior to the Closing) the consummation of the transactions contemplated by this
Agreement by the Selling Entities will not (i) conflict with or violate any
provisions of their respective Certificates of Incorporation or Bylaws, or (ii)
constitute a breach of or default under or result in the creation of any lien,
charge or other encumbrance or Tax on or against any assets, rights or property
of AOL, ANS or any ANS Entity or give rise, with or without notice or lapse of
time, to any third-party right of termination, cancellation, material
modification or acceleration (other than under any AOL or ANS stock plan or
agreement described on Schedule 3.11) under any note, bond, mortgage, pledge,
lien, lease, agreement, license, commitment or instrument applicable to AOL, ANS
or any ANS Entity or to which AOL, ANS or any ANS Entity is a party 

                                       14

 
or by which AOL, ANS or any ANS Entity is bound, or conflict with or violate any
restrictions of any kind to which any of them is subject, which breach, default,
lien, charge, encumbrance, Tax, termination, cancellation, modification or
acceleration would have a Material Adverse Effect or which would prevent or
materially delay the consummation of the transactions contemplated by this
Agreement or otherwise prevent the Selling Entities from performing their
respective obligations hereunder in any material respect, or (iii) subject to
obtaining the consents, approvals, orders, authorizations and registrations and
making the filings described in Section 3.4(b) below, violate any law, order,
writ, judgment, award, statute, rule, regulation or decree of any Governmental
Entity or arbitrator, which, if violated, would have a Material Adverse Effect
or which would prevent or materially delay the consummation of the transactions
contemplated by this Agreement or otherwise prevent either of the Selling
Entities from performing their respective obligations hereunder in any material
respect. The execution and delivery of this Agreement have been approved by the
Board of Directors of each of the Selling Entities. This Agreement has been duly
executed and delivered by each of the Selling Entities and, assuming this
Agreement constitutes a valid and binding obligation of WorldCom, enforceable
against it in accordance with its terms, constitutes a valid and binding
obligation of each of the Selling Entities, enforceable against each of the
Selling Entities in accordance with its terms.

     (b) No consent, approval, order or authorization of, or registration,
declaration or filing with, any Governmental Entity is required to be obtained,
made or filed by the Selling Entities or any AOL Entity in connection with the
execution and delivery of this Agreement by the Selling Entities or the
consummation by the Selling Entities of the transactions contemplated by this
Agreement, except for (i) the filing of a pre-merger notification and report
form by AOL under the HSR Act, (ii) filings with and, where required, approval
by one or more non-U.S. competition or antitrust regulatory bodies, (iii) the
filing with the SEC of such reports under the Exchange Act as may be required in
connection with this Agreement and the transactions contemplated by this
Agreement, and (iv) such consents, approvals, orders, authorizations,
registrations, declarations, or filings the failure of which to be obtained,
made or filed would not, (A) impair in any material respect the ability of
either of the Selling Entities to perform its obligations hereunder, (B) prevent
or impede, in any material respect, the consummation of the transactions
contemplated by this Agreement, or (C) have a Material Adverse Effect.

     3.5 Financial Information. Attached hereto as Schedule 3.5 are true,
complete and correct copies of (i) the unaudited consolidated balance sheet of
ANS as of June 30, 1997 (the "Balance Sheet") and the related statements of
income and cash flows (or the equivalent) for the fiscal year then ended
(collectively, the "Financial Statements") and (ii) the unaudited consolidated
balance sheet of ANS as of June 30, 1996 and the related statements of income
and cash flows (or the equivalent) for the fiscal year ended June 30, 1996
(together with the Financial Statements, the "ANS Financial Statements"). Each
of the ANS Financial Statements (including in all cases the notes thereto, if
any) presents fairly in all material respects the financial position, results of
operations and cash flows of ANS, including all applicable ANS Entities and the
ANS Network Services Business as of the times and for the periods referred to
therein, and such ANS Financial Statements (including all reserves included
therein) have been prepared in accordance with GAAP, consistently applied.

                                       15

 
     3.6 Subsequent Events. Except as set forth on Schedule 3.6, neither ANS nor
any ANS Entity has, from the date of the Balance Sheet to the date hereof:

     (a) Suffered any Material Adverse Change;

     (b) Discharged or satisfied any Material lien or encumbrance, or paid,
satisfied or incurred any Material obligation or liability (absolute, accrued,
contingent or otherwise) other than (i) liabilities shown or reflected on the
Balance Sheet or (ii) liabilities incurred since the date of the Balance Sheet
in the ordinary course of business, the discharge, satisfaction or incurrence of
which would not have a Material Adverse Effect;

     (c) Increased or established any reserve for Taxes or any other liability
on its books or otherwise provided therefor which, if paid in full, would have a
Material Adverse Effect;

     (d) Mortgaged, pledged or subjected to any lien, charge or other
encumbrance, any of the assets, tangible or intangible, which are Material to
the business, operations, properties, assets, liabilities or condition
(financial or otherwise) or prospects of ANS, the ANS Entities or the ANS
Network Services Business;

     (e) Sold or transferred any of the ANS Network Assets Material to ANS or
the ANS Network Services Business other than in the ordinary course of business
and consistent with past practice, or canceled any debts or claims or waived any
rights Material to ANS, the ANS Entities or the ANS Network Services Business;

     (f) Granted any general or uniform increase in the rates of pay of
employees or any increase in compensation payable or to become payable to any
director, officer or employee, consultant or agent of ANS, the ANS Entities or
the ANS Network Services Business (other than increases in the ordinary course
consistent with past practice), or by means of any bonus or pension plan, or
similar contract or agreement, increased the compensation of any director,
officer or employee agent (other than increases in the ordinary course
consistent with past practice);

     (g) Except for this Agreement and any other agreement executed and
delivered pursuant to this Agreement, entered into any Material transaction
other than in the ordinary course of business or expressly permitted under other
provisions hereof;

     (h) Made any capital commitment which, when added to all other capital
commitments made on behalf of ANS, the ANS Entities or the ANS Network Services
Business since the date of the Balance Sheet, exceeds $25,000,000 in the
aggregate;

     (i) Taken any action to (i) amend its Certificate of Incorporation or
Bylaws; (ii) declare, set aside or pay any dividend or other distribution with
respect to capital stock payable in cash, stock, securities or property other
than dividends paid by AOL's wholly owned subsidiaries to AOL or another of
AOL's wholly owned subsidiaries; or (iii) except as shown on Schedule 3.6(i),
issue, sell, transfer, pledge, dispose of or encumber, or redeem, purchase or

                                       16

 
otherwise acquire, directly or indirectly, any shares of, or securities
convertible into or exchangeable for, or options, warrants, calls, commitments
or rights of any kind to acquire, any shares of capital stock of any class of
ANS or any ANS Entity;

     (j) Adopted a plan of complete or partial liquidation, dissolution,
merger, consolidation, restructuring, recapitalization or other reorganization
of ANS;

     (k) Changed in any material respect its Tax or accounting methods,
principles or practices (including any changes in depreciation or amortization
policies or rates or any changes in any assumptions underlying any method of
calculating reserves), other than as required by a change in GAAP or other
applicable law; or

     (l) Entered into any agreement, contract, commitment or arrangement to
take any of the actions contemplated in the foregoing clauses (b) through (k),
or authorized, recommended, proposed or announced an intention to take any such
action.

     3.7 Legal Proceedings. Except as listed on Schedule 3.7, there is no suit,
claim, proceeding or investigation pending, or to the knowledge of either
Selling Entity, threatened against ANS, any of the ANS Entities or the ANS
Network Services Business or affecting the consummation of the transactions
contemplated by this Agreement which, if resolved adversely to ANS, any of the
ANS Entities or the ANS Network Services Business, would have a Material Adverse
Effect or which could prevent or materially delay the consummation of the
transactions contemplated by this Agreement. There are no Material judgments,
decrees, injunctions or orders of any Governmental Entity or arbitrator against
ANS or any of the ANS Entities or the ANS Network Services Business.

     3.8  Contracts

     (a) The Selling Entities have made available to WorldCom true and complete
copies of all outstanding Contracts Material to ANS. Except as otherwise
disclosed on Schedule 3.8(a), all of such Contracts are valid, binding and
enforceable in accordance with their terms (assuming the other parties thereto
are bound, as to which no Selling Entity has any reasonable basis to believe
otherwise) and in full force and effect, except where any such invalidity or
failure to be binding, enforceable or in full force and effect would not have a
Material Adverse Effect.  Except as otherwise indicated on Schedule 3.8(a), none
of AOL, ANS or any ANS Entity is, and to the knowledge of AOL, no other party to
such Contracts is in default thereunder, and no event has occurred which, with
or without the lapse of time or the giving of notice or both, would constitute a
default thereunder, except in each case for defaults as would not have,
individually or in the aggregate, a Material Adverse Effect.

     (b) Except as set forth on Schedule 3.8(b) and except for Contracts which
may be canceled by AOL, ANS or any ANS Entity within 30 days without penalty,
there are no Contracts to which ANS is a party or by which ANS or any ANS Entity
is bound that: (i) contain change of control or anti-assignment provisions
granting to another party or other parties thereto the right to terminate such
agreements or take other action adverse to ANS or any ANS Entity 

                                       17

 
upon or following the transactions contemplated by this Agreement, which
termination or adverse action would have a Material Adverse Effect; or (ii)
purport to limit ANS or any ANS Entity from providing any service in any
jurisdiction, whether under the ANS name, any ANS Entity name or WorldCom name
or otherwise (except under the name of AOL or any AOL Entity), or grant any
exclusive geographic, segment or other rights to any third-party, except where
the existence of which limitation or grant would not, after the Closing, have a
Material Adverse Effect.

     (c) The Selling Entities have made available to WorldCom true and complete
copies of all agreements to which ANS or any ANS Entity is a party which are
material to the relationship of ANS or any ANS Entity with international
distributors, including those certain license and distributorship agreements
with international distributors into which the ANS or an ANS Entity or, to the
knowledge of AOL, any licensees thereof have entered (collectively, the
"International Distribution Agreements").  Each International Distribution
Agreement is valid, binding and enforceable in accordance with its terms
(assuming the other parties thereto are bound, as to which no Selling Entity has
any reasonable basis to believe otherwise) and in full force and effect, except
where any such invalidity or failure to be binding, enforceable or in full force
and effect would not have  a Material Adverse Effect.  Except as set forth on
Schedule 3.8(c), to the knowledge of AOL, no party to any International
Distribution Agreement is in material violation of the terms and provisions of
any such agreement, except for violations which would not have a Material
Adverse Effect.

     (d) The Selling Entities and ANS Entities have made available to WorldCom
true and complete copies of the 10 largest (based upon annualized revenue as
estimated by AOL or ANS) contracts and agreements with customers of the network
services business of the ANS Network Services Business, which are identified on
Schedule 3.8(d). To the knowledge of AOL, each Network Services Agreement is
valid, binding and enforceable in accordance with its terms (assuming the other
parties thereto are bound, as to which AOL has no reasonable basis to believe
otherwise) and in full force and effect, except where any such invalidity or
failure to be binding, enforceable or in full force and effect would not have a
Material Adverse Effect.  To the knowledge of AOL, and except as set forth in
Schedule 3.8(d), no party to any such Network Services Agreement is in violation
of the terms and provisions thereof, except for violations which would not have
a Material Adverse Effect.

     (e) Schedule 3.8(e) contains a list of each contract between ANS or any
other ANS Entity and a Governmental Entity which is to be performed by or
through ANS or an ANS Entity and which accounted for at least 3% of the network
services revenues during the 12-month period ended June 30, 1997 (the
"Government Contracts"), true and complete copies of which have been made
available to WorldCom.  To the knowledge of AOL, all Government Contracts have
been legally awarded and are binding on the parties thereto and are not
currently the subject of protest proceedings, except as would not have a
Material Adverse Effect.

     (f) Except as set forth on Schedule 3.8(f) and except as would not result
in a Material Adverse Effect, no notice, consent, waiver or approval is
contemplated by or required to or from any party to the contracts, intellectual
property licenses, leases, agreements and arrangements 

                                       18

 
listed on Schedules 3.8(a) through 3.8(e) in connection with the execution and
delivery of this Agreement or the consummation of the transaction contemplated
hereby, except any such as would not materially delay or impede such
consummation.

     3.9 Accounts Receivable. Since the date of the Balance Sheet, neither AOL
nor ANS nor any other ANS Entity has materially changed any principle or
practice with respect to the recordation of accounts receivable of ANS, any ANS
Entity or the ANS Network Services Business or the calculation of reserves
therefor, or any material collection, discount or write-off policy or procedure
related thereto, except as required by GAAP or statutory accounting principles.

     3.10  Taxes.  Except as disclosed in Schedule 3.10:

     (a) All federal, state, local and foreign Tax Returns required to be filed
by or on behalf of each of ANS and the ANS Entities have been timely filed or
requests for extension have been timely filed and any such extension has been
granted and has not expired, and all such filed Tax Returns are accurate and
complete in all material respects, except for such failures to timely file,
request extension or be complete and accurate as would not, individually or in
the aggregate, have a Material Adverse Effect;

     (b) All Taxes required to be paid (including all required estimated Tax
payments and with respect to Taxes required to be withheld) by each of ANS and
the ANS Entities have been paid in full or adequately reserved in accordance
with GAAP on the ANS Financial Statements, other than any failure to pay or
reserve for as would not have a Material Adverse Effect;

     (c) As of the date hereof, there is no outstanding Tax audit, inquiry or
assessments (and no written notice of any such audit or inquiry has been
received) with respect to ANS or any other ANS Entity that would have a Material
Adverse Effect;

     (d) There are no waivers of the statute of limitations for the assessment
or payment of any Tax by ANS or any ANS Entity that would be Material to ANS or
any ANS Entity;

     (e) Neither ANS nor any ANS Entity has made any payment(s) since January 1,
1995, is obligated to make any payment(s) or is a party to any agreement that
could obligate it to make any payment(s) after the Closing that would not be
deductible under Code Section 280G or would constitute compensation in excess of
the limitation set forth in Code Section 162(m);

     (f) Neither ANS nor any ANS Entity has executed or entered into any closing
agreement under Code Section 7121 (or any similar provision of state, local or
foreign law) or has agreed to make any adjustment to its income or deductions
pursuant to Code Section 481(a) (or similar provision of state, local or foreign
law), in either case that could affect its Tax liability after the Closing Date
to any material extent;

     (g) Except as disclosed in Schedule 3.10(g), neither ANS nor any ANS Entity
is a party to a tax sharing, tax indemnity or similar agreement (whether or not
in writing);

                                       19

 
     (h) There are no Material Liens or Other Encumbrances with respect to Taxes
upon any of the assets or properties of ANS or any of the ANS Entities, other
than with respect to Taxes not yet due and payable;

     (i) Neither ANS nor any ANS Entity has been a member of an affiliated group
(within the meaning of the Code) filing a consolidated federal income Tax Return
other than a group the common parent of which is AOL; and

     (j) ANS is and will be as of the Closing Date a member of AOL's selling
consolidated group as defined in Treasury Regulation 1.338(h)(10)-1(c)(3) and
upon making a Section 338(h)(10) election will be a Section 338(h)(10) target
within the meaning of Treasury Regulation 1.338(h)(10)-1(c)(1).

     3.11  Employee Benefit Plans; Employment Matters.

     (a)  Except as set forth on Schedule 3.11(a), and except as would not
have a Material Adverse Effect, neither AOL, nor ANS nor any ANS Entity has
established or maintains or is obligated to make contributions to or under or
otherwise participates in with respect to any current or former employee or
director of ANS or any ANS Entity:  (i) any stock option, restricted stock,
stock appreciation rights, bonus or other type of incentive compensation plan,
program, agreement or arrangement; (ii) any severance, pension, profit-sharing,
thrift or savings, retirement, deferred compensation, employee stock ownership,
employee stock purchase or supplemental executive retirement plan, agreement or
arrangement, including, but not limited to, those described in Section 3(2) of
the Employee Retirement Income Security Act of 1974, as amended ("ERISA"); or
(iii) any life insurance, death benefit, health and hospitalization, disability,
cafeteria or Section 125, employee assistance, education or tuition assistance,
vacation benefit or fringe benefit plan, or other employee benefit plan,
program, agreement or arrangement, including, but not limited to, those
described in Section 3(1) of ERISA.  Except as disclosed on Schedule 3.11(a),
all such plans listed on Schedule 3.11(a) in which United States-based employees
participate (collectively, the "ANS Benefit Plans") have been operated and
administered in all material respects in accordance with all applicable laws,
rules and regulations, including, but not limited to ERISA, the Code, and the
Consolidated Omnibus Budget Reconciliation Act of 1985, as amended (and any
similar statute of a state or other jurisdiction, domestic or foreign, if
applicable).  With respect to each ANS Benefit Plan, AOL and ANS have made
available to WorldCom the following (to the extent they exist with respect to
such ANS Benefit Plan):  (i) the document(s) governing such plan, including, if
applicable, the plan document, the trust agreement, any insurance contract,
administrative services agreement, investment manager agreement, and any
amendments thereto; (ii) the two most recent annual reports of such plan on the
appropriate IRS Form 5500-series form; (iii) the financial statements of the
plan for the two most recent plan years, and if applicable, actuarial valuation
or other actuarial reports for the plan for the two most recent plan years; (iv)
the most recent summary plan description for the plan and any subsequent summary
of material modifications; (v) the most recent ruling letter with respect to the
tax-exempt status of any voluntary employee's beneficiary association under
Section 501(c)(9) of the Code which is implementing such plan; and (vi) for each

                                       20

 
plan that is intended to be qualified under Section 401(a) of the Code, a copy
of the most recent IRS determination or opinion letter.  Except as disclosed on
Schedule 3.11(a), and except as would not have a Material Adverse Effect, no act
or failure to act by AOL, ANS or any other AOL Entity (i) has resulted in a
"prohibited transaction" (as defined in ERISA) with respect to the ANS Benefit
Plans that is not subject to a statutory or regulatory exception; or (ii) has
resulted or could reasonably be expected to result in the imposition of any Tax,
penalty or other liability in any material amount on ANS or any ANS Entity
pursuant to any provision of the Code or ERISA or any other applicable law.  No
ANS Benefit Plan is subject to Title IV of ERISA; and no circumstance exists or
will exist as a result of the consummation of the transactions contemplated by
this Agreement that could result in the existence of a lien on the property of
AOL, ANS or any AOL Entity under the provisions of Title IV of ERISA (other than
one or more liens that are disclosed in Schedule 3.11(a) or would not have a
Material Adverse Effect).  Neither AOL, ANS nor any AOL Entity has previously
made, is currently making, or is obligated in any way to make, any contributions
to any multi-employer plan within the meaning of Section 3(37) of ERISA in which
ANS employees participate. AOL, ANS and each AOL Entity has made all
contributions or payments required under the terms of or in connection with all
ANS Benefit Plans or has properly reserved for such amounts on the Balance Sheet
except for amounts that would not be material.  Except as disclosed on Schedule
3.11(a) no ANS Benefit Plan provides health and hospitalization or other medical
or life insurance benefits to terminated or retired employees or agents (other
than benefits mandated by applicable law).  Neither AOL, ANS nor any other AOL
Entity has, with respect to any ANS employees, any obligation or commitment
(formal or informal) to create any new benefit plan or program in which
employees of ANS or any ANS Entities may participate, or to amend any existing
ANS Benefit Plan to increase the benefits thereunder.  AOL, ANS and each AOL
Entity is in compliance with all requirements applicable to any retirement or
other employee benefit plan maintained for its non-United States ANS employees
other than any failures to comply that would not individually or in the
aggregate have a Material Adverse Effect, and there is no material unfunded
liability with respect to any such plan which is not properly reflected in or
reserved for in the Balance Sheet.

     (b) Except as set forth on Schedule 3.11(b) or Schedule 5.13, neither
AOL, ANS nor any AOL Entity is a party to any oral or written (i) union, guild
or collective bargaining agreement which covers its employees in the United
States (nor is AOL or AOL aware of any union organizing activity currently being
conducted in respect to any of AOL's, ANS's or any ANS Entity's employees), (ii)
agreement with any officer or employee the material benefits of which are
contingent, or the terms of which are materially altered, upon the occurrence of
a transaction of the nature contemplated by this Agreement or which provides for
any payment or payments (including any severance, unemployment compensation,
golden parachute, bonus or otherwise) of more than an aggregate of $1,000,000
for all such officers and employees upon such occurrence, or (iii) agreement or
plan, including any stock option plan, stock appreciation rights plan,
restricted stock plan or stock purchase plan, any of the benefits of which will
be increased, or with respect to vesting, will be accelerated, by the occurrence
of any of the transactions contemplated by this Agreement, to the extent that
any of the matters referred to in this paragraph (b) would affect ANS or any of
the ANS Entities.

                                       21

 
     (c) None of the companies with which ANS is a member of a "controlled
group" within the meaning of Section 1563(a) of the Code nor any administrator
or fiduciary of any employee benefit plan adopted by a member of such controlled
group (or any agent of any of the foregoing) has engaged in any transaction or
acted or failed to act in a manner which is reasonably likely to subject
WorldCom to any material liability (to individuals, the IRS, the Pension Benefit
Guaranty Corporation, or any other party) for breach of fiduciary duties,
accumulated funding deficiencies, termination or other liability under ERISA,
the Code, or any other applicable laws.

     (d) Each ANS Benefit Plan to which ANS is a party, other than the ANS
stock option plan, as it may apply to the participation of the ANS Employees,
may be amended or terminated by ANS or WorldCom on or at any time after the
Closing Date.

     3.12  Compliance with Laws; Permits.

     (a) Except as disclosed on Schedule 3.12, neither ANS nor any ANS Entity
(acting in connection with the ANS Network Services Business) has violated,
failed to comply with or acted or failed to act in any material respect so as to
incur liability under any federal, state, local or foreign law, regulation or
ordinance, judgment, decree or order relating to its business, operations,
properties or Assets, including the Occupational Safety and Health Act, the
Americans with Disabilities Act, export control laws, and any Environmental
Laws, except where a violation, action or failure to act would not have, a
Material Adverse Effect, and no notice from any Governmental Entity of any
pending investigation or violation by ANS or any ANS Entity of, non-compliance
by ANS or any ANS Entity with or alleged liability of ANS or any ANS Entity
under, any such law, regulation, ordinance, judgment, decree or order has been
received by AOL, ANS or any ANS Entity, which, if it were determined that a
violation had occurred, would have a Material Adverse Effect.

     (b) ANS and each ANS Entity possesses all Material Governmental
Authorizations necessary to enable it to conduct its business, including the ANS
Network Services Business, as presently conducted, except for those Governmental
Authorizations the failure to possess which would not have a Material Adverse
Effect.  All such Governmental Authorizations are valid and in full force and
effect, except for those authorizations the failure of which to be valid and in
full force and effect would not have a Material Adverse Effect.  ANS and each
ANS Entity is, and at all times since May 1, 1995 has been, in compliance with
the terms and requirements of each such Governmental Authorization, except where
the failure to be so in compliance would not have a Material Adverse Effect.
Since May 1, 1995, neither AOL nor ANS nor any ANS Entity has received any
notice or other communication from any Governmental Entity asserting (a) any
violation of or failure of ANS or any ANS Entity to comply with any term or
requirement of any Governmental Authorization, or (b) any revocation,
withdrawal, suspension, cancellation, termination or modification of any
Governmental Authorization held by ANS nor any ANS Entity, except where any such
violation, failure to comply, revocation, withdrawal, suspension, cancellation,
termination or modification would not have a Material Adverse Effect.

                                       22

 
     3.13  Patents, Trademarks, Etc.

     (a) Except as disclosed on Schedule 3.13 hereto, ANS and the ANS Entities
own, or will own prior to the Closing, free and clear of all Liens or Other
Encumbrances, or have, or will have prior to the Closing, the right to use,
sell, license or dispose of or otherwise has rights to use, such patents,
copyrights, trademarks, service marks, and applications and registrations
therefor, and trade names, trade secrets, customer lists, proprietary technology
processes and formulae, source code, object code, know-how, inventions, other
confidential and proprietary information, and other intellectual property rights
as are necessary to permit ANS and the ANS Entities to carry on the ANS Network
Services Business as currently conducted, except for failures to own free and
clear, license to use or otherwise have sufficient rights to use as would not
have a Material Adverse Effect (the "ANS Rights"). Schedule 3.13 sets forth all
registered patents, copyrights, trademarks and service marks included in the ANS
Rights, all of which are in full force and effect and are not subject to any
Taxes or maintenance fees, except as set forth on Schedule 3.13 or except where
the failure to be in full force or effect or to be so subject would not have a
Material Adverse Effect. Except as set forth on Schedule 3.13, neither AOL nor
any of the AOL Entities has licensed or granted to anyone the right to use the
name "ANS" or any other name associated with or used by AOL or any of the AOL
Entities in connection with the ANS Network Services Business. Except as set
forth on Schedule 3.13, none of AOL, ANS or any of the AOL Entities (i) has
licensed or granted to anyone rights of any nature to use any ANS Rights that
would limit the exercise of such ANS Rights by ANS or any ANS Entity against
such licensee or grantee if such licensee or grantee were to use the property
protected by such ANS Rights in competition with ANS or any ANS Entity or that
would limit or prevent ANS or any ANS Entity from using, selling, licensing or
disposing of ANS Rights in any market or geographic region, including in direct
competition with any licensee of such ANS Rights in such geographic region; (ii)
is obligated or pays royalties, fees or other payments to anyone for use of any
single ANS Right exceeding $2,000,000 in the aggregate; and (iii) has received
notice from any third party or otherwise has knowledge that any of ANS Rights or
any services or products marketed or sold by ANS or any AOL Entity in connection
with the ANS Network Services Business violates any intellectual property right
of a third party, except for such violations as would not have a Material
Adverse Effect. To the knowledge of either Selling Entity, there exists no
infringement by any third party of any ANS Rights that would have a Material
Adverse Effect and there is no pending or, to the knowledge of either Selling
Entity, threatened claim or litigation against AOL, ANS or any AOL Entity
contesting its use of any of ANS Rights, asserting the misuse of any of ANS
Rights, or asserting the infringement or other violation of any rights of a
third party, nor, to the knowledge of either Selling Entity is there any
reasonable basis for any such claim, where, in any such case, individually or in
the aggregate, such infringement, claim or litigation would have a Material
Adverse Effect.

     (b) All copyrightable works, inventions and know-how conceived by employees
or, to AOL's knowledge, independent contractors of AOL, ANS or AOL Entity within
the scope of their employment or retention, as the case may be, and related to
the ANS Network Services Business were and are "works for hire," or if they were
or are not, then all right, title, and interest therein were transferred and
assigned to, or vested in, ANS or an AOL Entity, except where the 

                                       23

 
failure to be "works for hire" or to have been so transferred assigned or vested
would not have a Material Adverse Effect.

     (c) Except as set forth on Schedule 3.13, the consummation of the
transactions contemplated by this Agreement will not alter, impair or extinguish
any of the ANS Rights, the alteration, impairment or extinguishing of which
would have a Material Adverse Effect.  Following the consummation of the
transactions contemplated hereby, ANS and each ANS Entity will own, free and
clear of all Liens or Other Encumbrances, or have the exclusive right to use,
sell, license or dispose of or otherwise will have sufficient rights to use, ANS
Rights, except for failures to own free and clear, license to use or otherwise
have sufficient rights to use as would not have a Material Adverse Effect.

     3.14 No Assets Held by AOL or AOL Entities. Except as set forth on Schedule
3.14, except for ANS Excluded Assets and except for assets held by AOL Entities
which are to be used by such entities pursuant to the Transition Services
Agreement in accordance with the terms thereof (none of which is Material to ANS
or the ANS Entities, including the ANS Network Services Business), immediately
after the Closing, (a) neither AOL nor any AOL Entity will hold or possess any
assets or rights (including contractual rights, patents, copyrights, trademarks,
service marks, and applications and registrations therefor, and trade names,
trade secrets, customer lists, proprietary technology processes and formulae,
source code, object code, know-how, inventions, other confidential and
proprietary information, and other intellectual property rights, but excluding
the technical knowledge, expertise and other know-how developed by AOL and the
AOL Entities in the course of their business prior to the Closing) principally
used in or necessary for the business of ANS or the ANS Entities, including the
ANS Network Services Business (all of which, prior to the Closing, will be
transferred and contributed to ANS in accordance with Section 2.1), and (b)
except as expressly provided herein, neither AOL nor any AOL Entity will be a
party to any contract, intellectual property license, lease, agreement or other
binding arrangement (including any intercompany contract, arrangement or
agreement with ANS or an ANS Entity) necessary to the business of ANS or an ANS
Entity.

     3.15 Labor Matters. Neither ANS nor any ANS Entity nor AOL (in connection
with the ANS Network Services Business) is the subject of any proceeding (a)
asserting that AOL, ANS or any ANS Entity has committed an unfair labor practice
or (b) seeking to compel AOL, ANS or any ANS Entity to bargain with a labor
union or labor organization, and there are no pending or, to the knowledge of
either Selling Entity, threatened, nor has there been for the past five years
any, labor strike, dispute, walkout, work stoppage, slow-down or lockout
involving ANS or any ANS Entity or (in connection with the ANS Network Services
Business) any AOL Entity, except in each case as would not have a Material
Adverse Effect.

     3.16 Insurance. AOL and/or ANS and/or each ANS Entity has obtained and
maintains in full force and effect insurance with responsible and reputable
insurance companies or associations in such amounts, on such terms and covering
such risks, including fire and other risks insured against by extended coverage,
as is reasonably deemed necessary by AOL, and has maintained in full force and
effect public liability insurance, insurance against claims for personal injury
or death or property damage occurring in connection with the activities of ANS

                                       24

 
and each ANS Entity and the ANS Network Services Business or any properties
owned, occupied or controlled by ANS or AOL or any ANS Entity (in connection
with the conduct of the ANS Network Services Business), except for failures to
obtain or maintain as would not have a Material Adverse Effect.

     3.17 Commissions and Fees. There are no valid claims for brokerage
commissions, investment bankers' fees or finder's or similar fees in connection
with the transactions contemplated by this Agreement which may be now or
hereafter asserted against WorldCom or ANS or any ANS Entity resulting from any
action taken by AOL, ANS, any ANS Entity or their stockholders, directors,
officers, employees or agents.

     3.18 Real Property. ANS and the ANS Entities own no real estate except as
shown on Schedule 3.18. The real estate occupied by ANS and the ANS Entities is
held under leases, which ANS lease obligations are guaranteed by AOL, each as
described on such Schedule, each of which is in full force and effect in
accordance with its terms, and each of AOL, ANS and the ANS Entities are in
compliance in all material respects with their respective obligations
thereunder.

                                   ARTICLE IV

               REPRESENTATIONS AND WARRANTIES REGARDING WORLDCOM

     WorldCom hereby makes the following representations and warranties to AOL
and ANS:

     4.1 Organization, Existence and Good Standing. WorldCom is a corporation
duly organized and validly existing under the laws of the State of Georgia and
has all necessary corporate power and authority to own, lease and operate its
properties and to conduct its business as currently conducted. WorldCom is duly
qualified to do business as a foreign corporation and, to the extent such
concept is applicable in such jurisdictions, is in good standing in each
jurisdiction in which the properties owned, leased or operated by it or the
nature of the business conducted by it makes qualification necessary, except
where the failure to be so duly qualified and in good standing would not have a
Material Adverse Effect.

     4.2  Power and Authority; Non-Contravention; Filings and Consents.

     (a) WorldCom has full corporate power and authority to execute, deliver and
perform its obligations under this Agreement and all other agreements and
documents executed and delivered, or to be executed and delivered, by it
pursuant to this Agreement and has taken all action required by law, its Second
Amended and Restated Articles of Incorporation, its Bylaws or otherwise, to duly
and validly authorize the execution and delivery of, and the performance of its
obligations under, this Agreement and such related agreements and documents and
the consummation of the transactions contemplated hereby and thereby. The
execution and delivery of and the performance of its obligations under this
Agreement and such other agreements do not and the consummation of the
transactions contemplated by this Agreement and such other agreements will not
(i) conflict with or violate any provisions of the Second Amended and 

                                       25

 
Restated Articles of Incorporation or Bylaws of WorldCom, (ii) constitute a
breach of or default under or result in the creation of any lien, charge or
other encumbrance or Tax on or against any assets, rights or property of
WorldCom or give rise, with or without notice or lapse of time, to any third-
party right of termination, cancellation, material modification or acceleration
under any note, bond, mortgage, pledge, lien, lease, agreement, license,
commitment or instrument applicable to WorldCom, or to which WorldCom is a party
or by which WorldCom is bound, or conflict with or violate any restrictions of
any kind to which it is subject, which breach, default, lien, charge,
encumbrance, Tax, termination, cancellation, modification or acceleration would
have a Material Adverse Effect, or which would prevent or materially delay the
consummation of the transactions contemplated by this Agreement or otherwise
prevent WorldCom from performing its obligations hereunder in any material
respect, or (iii) subject to obtaining the consents, approvals, orders,
authorizations and registrations and making the filings described in Section
4.2(b) below, violate any law, order, writ, judgment, award, statute, rule,
regulation or decree of any Governmental Entity or arbitrator, which, if
violated or accelerated, would have a Material Adverse Effect or which would
prevent or materially delay the consummation of the transactions contemplated by
this Agreement or otherwise prevent WorldCom from performing its obligations
hereunder in any material respect. The execution and delivery of this Agreement
and the transactions contemplated hereby have been approved by the Board of
Directors of WorldCom. This Agreement has been duly executed and delivered by
WorldCom and, assuming this Agreement constitutes the valid and binding
obligations of AOL and ANS enforceable against them in accordance with its
terms, constitutes valid and binding obligations of WorldCom, enforceable
against WorldCom in accordance with its terms.

     (b) No consent, approval, order or authorization of, or registration,
declaration or filing with any Governmental Entity is required to be obtained,
made or filed by WorldCom in connection with the execution and delivery of this
Agreement by WorldCom or the consummation by WorldCom of the transactions
contemplated hereby, except for (i) the filing of a pre-merger notification and
report form by WorldCom under the HSR Act, (ii) filings with and, where
required, approval by one or more non-U.S. competition or antitrust regulatory
bodies, (iii) filings with the SEC of such reports under the Exchange Act as may
be required in connection with this Agreement and the transactions contemplated
by this Agreement, and (iv) such consents, approvals, orders, authorizations,
registrations, declarations, or filings the failure of which to be obtained,
made or filed would not, (A) impair in any material respect the ability of
WorldCom to perform its obligations hereunder, (B) prevent or impede, in any
material respect, the consummation of the transactions contemplated by this
Agreement, or (C) have a Material Adverse Effect.

     4.3 Legal Proceedings. There is no suit, claim, proceeding or investigation
pending or, to the knowledge of WorldCom, threatened against WorldCom or any
WorldCom Entity, CompuServe, CompuServe-Ohio or any other CompuServe Entity
affecting the consummation of the transactions contemplated hereby which, if
resolved adversely to any of them, would have a Material Adverse Effect with
respect to WorldCom or the CompuServe Online Services Business, or which could
prevent or materially delay the consummation of the transactions contemplated by
this Agreement. Except as set forth on Schedule 4.3, there are no Material
judgments, decrees, injunctions or orders of any Governmental Entity or
arbitrator against

                                       26

 
WorldCom or any WorldCom Entity, CompuServe, CompuServe-Ohio or any other
CompuServe Entity.

     4.4 No Vote Required. No vote of the holders of any class or series of
WorldCom capital stock is necessary to approve this Agreement or the
consummation of the transactions contemplated hereby.

     4.5 Investment Representation. WorldCom acknowledges that the transfer of
the ANS Shares by AOL hereunder will not be registered under the Securities Act
of 1933, as amended, or under any state securities laws, that the ANS Shares
will be transferred in a private placement transaction exempt from the
registration requirements under such Act, and that the ANS Shares may not be
further transferred by WorldCom except pursuant to an effective registration
under such Act or in a transaction exempt from such registration requirements.
WorldCom is acquiring the ANS Shares hereunder for its own account, for
investment and not with the intention of distributing the ANS Shares.

     4.6 CompuServe Agreement. The CompuServe Agreement has been duly authorized
by all necessary corporate action of WorldCom and has been duly executed and
delivered by WorldCom on the date of this Agreement, in the form which has been
delivered to AOL. The CompuServe Agreement is the valid and binding obligation
of WorldCom enforceable against WorldCom in accordance with its terms.

     4.7 Title to CompuServe Assets. On the Closing Date, WorldCom will transfer
to AOL or its designee(s) good title to the CompuServe Assets and the CompuServe
Online Services Business (except as provided in Section 1.4 in respect of
Delayed Assets, if any), free and clear of any Lien or Other Encumbrances which
would have a Material Adverse Effect with respect to the CompuServe Online
Services Business.

     4.8 Representations Relating to CompuServe Assets. Subject to the
limitations hereinafter referred to, each of the representations, warranties and
covenants of Block, Block Group and CompuServe set forth in the CompuServe
Agreement (including related definitions, except for the definitions of
"Material", "Material Adverse Change" and "Material Adverse Effect", which shall
have the meanings given in this Agreement), to the extent, but only to the
extent, that they relate, directly or indirectly, to the CompuServe Assets, the
CompuServe Liabilities or the CompuServe Online Service Business, or to the
transfer to WorldCom pursuant to the CompuServe Agreement of any of the
foregoing, or relating to Block, Block Group or CompuServe to the extent they
may affect any of the items mentioned above in this Section 4.8, are
incorporated herein by this reference and shall be deemed, for purposes of this
Agreement, to be representations, warranties and covenants made by WorldCom to
and for the benefit of AOL and its designee or designees.

     4.9 CompuServe Power and Authority; Non-Contravention; Filings and
Consents. As of the Closing Date, each of CompuServe and the applicable
CompuServe Entities will have full corporate power and authority to transfer the
CompuServe Assets as contemplated by this Agreement and will have taken all
action required by its governing documents or otherwise to 

                                       27

 
duly and validly authorize such transfers and the consummation of the other
transactions contemplated hereby. Such transfers and such other transactions, in
respect of CompuServe or any such CompuServe Entity, will not (i) conflict with
or violate any provisions of its governing documents, or (ii) constitute a
breach of or default under or result in the creation of any Liens or Other
Encumbrances or Tax on or against any of its assets, rights or property or give
rise, with or without notice or lapse of time (other than under any CompuServe
Stock Plans as contemplated by the CompuServe Agreement), to any third-party
right of termination, cancellation, material modification or acceleration under
any note, bond, mortgage, pledge, lien, lease, agreement, license, commitment or
instrument applicable to it, or to which it is a party or by which it or any of
its assets is bound, or conflict with or violate any restrictions of any kind to
which it is subject, which conflict, violation, breach, default, Lien or Other
Encumbrance, Tax, termination, cancellation, modification or acceleration would
have a Material Adverse Effect with respect to the CompuServe Online Services
Business or which would prevent or materially delay the consummation of the
transactions contemplated by this Agreement or otherwise prevent WorldCom from
causing CompuServe and such CompuServe Entities to perform the transactions
contemplated hereby in any Material respect, or (iii) violate any law, order,
writ, judgment, award, statute, rule, regulation or decree of any Governmental
Entity or arbitrator, which, if violated or accelerated, would have a Material
Adverse Effect with respect to the CompuServe Online Services Business or which
would prevent or materially delay the consummation of the transactions
contemplated by this Agreement or otherwise prevent WorldCom from causing
CompuServe and such CompuServe Entities to perform the transactions contemplated
hereby in any Material respect.

                                   ARTICLE V

                                   COVENANTS

     5.1 Interim Conduct of ANS and each ANS Entity and the ANS Network Services
Business. AOL and ANS covenant to use all reasonable efforts to ensure, and to
cause each ANS Entity to use all reasonable efforts to ensure that, except (1)
as contemplated by this Agreement or (2) with the prior written consent of
WorldCom ,which will not unreasonably be withheld, after the date hereof and
until the earlier of the termination of this Agreement pursuant to Article VIII
and the Closing Date:

     (a) Subject to the other provisions of this Section 5.1, the business
of ANS, the ANS Entities and the ANS Network Services Business, including
investment practices and policies, will be conducted only in the ordinary course
of business consistent with past practice, and AOL, ANS and the ANS Entities
will use all reasonable efforts to preserve the ANS Network Services Business
and maintain in all material respects its existing relations with its customers,
suppliers, employees, creditors and business partners, in each case taking into
account the existence and announcement of the transactions referred to herein;

     (b) AOL (with respect to the ANS Network Services Business), ANS and
each ANS Entity will continue to make capital expenditures, maintain, upgrade
and expand their facilities relating to, and otherwise operate in all material
respects, the ANS Network Services Business in accordance with the budget and

                                       28

 
plan of ANS for the fiscal year ending June 30, 1998, a copy of which has been
delivered to WorldCom prior to the date hereof (the "Budget");

     (c) Neither AOL, ANS nor any ANS Entity will permit there to be,
directly or indirectly, any split, combination or reclassification of the
outstanding shares of capital stock of ANS or interest in or securities of any
ANS Entity;

     (d) Neither AOL, in connection with the ANS Network Services Business,
nor ANS nor any ANS Entity will:  (i) amend the Certificate of Incorporation or
Bylaws of ANS or any ANS Entity; (ii) declare, set aside or pay any dividend or
other distribution with respect to the capital stock of ANS or interest in or
securities of any ANS Entity payable in cash, stock, securities or property;
(iii) issue, sell, transfer, pledge, dispose of or encumber any shares of, or
securities convertible into or exchangeable for, or options, warrants, calls,
commitments or rights of any kind to acquire, any shares of capital stock of any
class of ANS or interest in or securities of any ANS Entity; (iv) transfer,
lease, license, sell, mortgage, pledge, dispose of, or encumber any Assets in an
amount in any instance or series of related instances exceeding $1,000,000
(measured in terms of net book value) in the aggregate except pursuant to the
existing terms of the contracts entered into prior to the date hereof and set
forth on Schedule 5.1(d); or (v) redeem, purchase or otherwise acquire, directly
or indirectly, any of the capital stock of ANS or interest in or securities of
any ANS Entity, except in connection with securities issued as compensation to
ANS employees, as described on Schedule 5.1(d);

     (e) Except as shown on Schedule 5.1(e), neither AOL, in connection with the
ANS Network Services Business, nor ANS nor any ANS Entity will: (i) hire or
terminate any employees and consultants except in the ordinary course of
business consistent with past practice; (ii) grant any increase in the
compensation or bonus payable or to become payable to any director, officer or
employee except in the ordinary course of business and consistent with past
practice; (iii) adopt any new, or amend or otherwise increase, or accelerate the
payment or vesting of the amounts payable or to become payable under any
existing AOL or ANS Benefit Plan except in the ordinary course of business and
consistent with past practice; (iv) enter into any, or amend any existing,
employment, consulting or severance agreement with, or grant any severance or
termination pay, to any officer, director or employee except in the ordinary
course of business and consistent with past practice; (v) make any additional
contributions to any grantor trust created by AOL or any AOL Entity to provide
funding for non-tax-qualified employee benefits or compensation except as
required by the terms of any grantor trust of AOL existing on the date hereof;
or (vi) provide any new severance program to or increase the benefits under any
existing severance program;

     (f) Except as would not be Material, and except for releases of
guarantees by AOL in favor of ANS which are shown on Schedule 7.3(f) hereto,
neither AOL, in connection with the ANS Network Services Business, nor ANS nor
any ANS Entity will in any respect modify, amend or terminate any of its
Contracts, or waive, release or assign any rights or claims thereto or
thereunder;

                                       29

 
     (g) Except as would not be Material, neither AOL, in connection with
the ANS Network Services Business, nor ANS nor any ANS Entity will permit any
insurance policy naming either of them as a beneficiary or a loss payable payee
to be canceled or terminated;

     (h) Except as set forth on Schedule 5.1(h), neither AOL, in connection
with the ANS Network Services Business, nor ANS nor any ANS Entity will, except
as provided in the Budget, (i) incur or assume any debt; (ii) assume, guarantee,
endorse or otherwise become liable or responsible (whether directly,
contingently or otherwise) for the obligations of any other Person except an ANS
Entity in an amount exceeding $1,000,000; (iii) make any loans, advances or
capital contributions to, or investments in, any other Person (other than a
wholly-owned ANS Entity) in an amount exceeding $1,000,000 in the aggregate, or
modify any credit policies or practices granted to customers or make any
concessions or offer any inducements to accelerate payments; (iv) enter into any
financial commitments (including any capital expenditure or asset purchase),
except in the ordinary course of business and consistent with past practice; (v)
other than in the ordinary course and consistent with past practice, enter into
any contract granting any third-party geographic or Material market or
programming or content exclusivity; or (vi) enter into any contract that is not
terminable without penalty on or prior to December 31, 2000 except in the
ordinary course of business consistent with past practice;

     (i) Except as would not be Material, neither AOL, in connection with
the ANS Network Services Business, nor ANS nor any ANS Entity will change any of
its Tax or accounting principles or practices (including any changes in
depreciation or amortization policies or rates or any changes in any assumptions
underlying any method of calculating reserves) unless required by GAAP or
applicable law and unless notice thereof is given to WorldCom promptly
thereafter;

     (j) Except as expressly provided in this Agreement, neither AOL (in
connection with the ANS Network Services Business), nor ANS nor any ANS Entity
will pay, discharge or satisfy any claims, liabilities or obligations (absolute,
accrued, asserted or unasserted, contingent or otherwise), other than the
payment, discharge or satisfaction of any such claims, liabilities or
obligations (i) reflected or reserved against in, or contemplated by, the
Balance Sheet in an amount not in excess of that in the Balance Sheet; (ii)
incurred in the ordinary course of business since the date of the Balance Sheet
in a manner consistent with past practice; (iii) which are legally required to
be paid, discharged or satisfied and are in accordance with the terms in
existence as of the date of this Agreement; or (iv) out of insurance proceeds;

     (k) Neither AOL, in connection with the ANS Network Services Business,
nor ANS nor any ANS Entity will adopt a plan of complete or partial liquidation,
dissolution, merger, consolidation, restructuring, recapitalization or other
reorganization of ANS or any ANS Entity;

     (l) Except as contemplated by this Agreement, neither AOL, in connection
with the ANS Network Services Business, nor ANS nor any ANS Entity will engage
in any transaction, or enter into any agreement, arrangement, or understanding
with, directly or indirectly, any Related Party, other than those existing as of
the date hereof which are listed on Schedule 5.1(l)

                                       30

 
hereof and except for arm's-length transactions in the ordinary course of
business consistent with past practice;

     (m) Except as would not be Material or as contemplated by Article VI
hereof, neither AOL, in connection with the ANS Network Services Business, nor
ANS nor any ANS Entity will make any Tax election;

     (n) Neither AOL, in connection with the ANS Network Services Business,
nor ANS nor any ANS Entity will settle any litigation, other proceeding or
arbitration requiring a payment in excess of $250,000 individually or $1,000,000
in the aggregate or involving any Material limitation on the future actions of
ANS or any ANS Entity or the surrender or compromise of any of their Material
rights;

     (o) Neither AOL nor any of the AOL Entities will take any action which
would be prohibited, following Closing, under Section 2 of the Noncompetition
and Nonsolicitation Agreement, the form of which appears as Exhibit E, provided
that the foregoing shall not prohibit the continued ownership and operation of
ANS by AOL as contemplated by this Agreement;

     (p) Neither AOL, in connection with the ANS Network Services Business, nor
ANS nor any ANS Entity will increase or establish any reserve for Taxes or any
other liability on its books or otherwise provided therefor which, if paid in
full, would have a Material Adverse Effect;

     (q) Neither AOL nor ANS nor any ANS Entity will enter into an agreement,
contract, commitment or arrangement to do any of the foregoing, or to authorize,
recommend, propose or announce an intention to do any of the foregoing; and

     (r) Neither AOL nor ANS nor any ANS Entity will act, or fail or omit to
act, so as to cause any Material Adverse Change.

     5.2  Indemnification.

     (a) Indemnification by AOL. AOL hereby agrees to indemnify, defend and hold
harmless WorldCom and the WorldCom Entities and, after the Closing Date, ANS and
the ANS Entities, each of their respective designees, successors-in-interest and
assigns, and each of their respective past and current directors, officers,
employees, consultants, representatives and agents (the "WorldCom Indemnified
Parties"), from and against any and all Losses and Expenses to the extent such
Losses and Expenses are based on, arise out of or relate to, directly or
indirectly (i) the conduct of the business and affairs of AOL or any claim,
action or proceeding brought by or on behalf of Persons who are or were or
become holders of the capital stock of AOL or ANS at or prior to the Effective
Time, which claim, action or proceeding alleges that any action or failure to
act of the issuer of such capital stock, any Affiliate of such issuer or any
director, officer, employee or agent of such issuer or any Affiliate of such
issuer in connection with this Agreement or any of the transactions contemplated
hereby was wrongful, illegal or constituted a

                                       31

 
breach of duty; (ii) the ownership and operation of the CompuServe Assets and
the CompuServe Online Services Business from and after the Closing, and any
breach by AOL or any AOL Entity of its obligations under the Assignment and
Assumption Agreement; (iii) the CompuServe Liabilities; (iv) any breach of the
representations, warranties and covenants set forth in Sections 3.1, 3.2, 3.4,
3.14, 3.17, 5.6 or 5.10; or (v) any breach of any other representations,
warranties, covenants or agreements of AOL or ANS or any ANS Entity herein,
without regard to any qualification as to materiality stated herein (including
any reference to material, Material, Material Adverse Change or Material Adverse
Effect), if and to the extent that the aggregate of all Losses and Expenses
related to or arising out of all breaches (other than with respect to an
intentional breach of any such representation, warranty, covenant or agreement,
as to which no dollar threshold shall apply) described in this clause (v)
exceeds $25 million; or (vi) any action, claim or proceeding brought in
connection with the enforcement of the foregoing clauses.

     (b) Indemnification by WorldCom.  WorldCom and, from and after the
Closing, ANS hereby agree, jointly and severally, to indemnify, defend and hold
harmless AOL and each AOL Entity and each of their respective designees,
successors in interest and assigns and each of their respective past and current
directors, officers, employees, consultants, representatives and agents (the
"AOL Indemnified Parties") from and against any Losses and Expenses (or, in the
case of Losses and Expenses relating to any representation, warranty or covenant
incorporated herein pursuant to Section 4.8 hereof, 80.1% of such Losses and
Expenses) which are based on, arise out of or relate to, directly or indirectly,
(i) the conduct by WorldCom or the WorldCom Entities of the business of ANS, the
ANS Entities or the ANS Network Services Business after the Closing, or any
liability in respect of matters referred to in Schedule 8.4(b) to the CompuServe
Agreement; (ii) the conduct by WorldCom or the WorldCom Entities of CompuServe's
businesses other than the CompuServe Online Services Business after the Closing;
(iii) any breach of the representations, warranties and covenants set forth in
Sections 4.6 and 4.7 hereof or Sections 2.1, 2.2, 3.1, 3.2, 3.3, 3.4, 3.14,
3.17, 3.18, 4.1, 4.2, 4.3, 4.5, 4.6, 8.2, 8.3, 8.6, 8.7, 8.10 or 8.14 of the
CompuServe Agreement to the extent incorporated herein under Section 4.8; (iv)
any breach of any other representations, warranties, covenants or agreements of
WorldCom or any WorldCom Entity herein (other than those incorporated by
reference under Section 4.8), without regard to any qualification as to
materiality stated herein or in the CompuServe Agreement (including any
reference to material, Material, Material Adverse Change or Material Adverse
Effect in this Agreement or in the CompuServe Agreement), if and to the extent
that the aggregate of all Losses and Expenses related to or arising out of all
breaches (other than with respect to an intentional breach of any such
representation, warranty, covenant or agreement, as to which no dollar threshold
shall apply) described in this clause (iv) exceeds $10 million; (v) any breach
of any other representations, warranties, covenants or agreements of WorldCom or
any WorldCom Entity to the extent incorporated by reference herein under Section
4.8, without regard to any qualification as to materiality stated herein or in
the CompuServe Agreement (including any reference to material, Material,
Material Adverse Change or Material Adverse Effect in this Agreement or in the
CompuServe Agreement), if and to the extent that 80.1% of the aggregate of all
Losses and Expenses related to or arising out of all breaches (other than with
respect to an intentional breach of any such representation, warranty, covenant
or agreement, as to which no dollar threshold shall apply) described in this
clause (v) exceeds $10 million; or (vi) any action, claim or proceeding brought
in connection with the enforcement of the foregoing 

                                       32

 
clauses; provided, that, in connection with any claim made hereunder in respect
of which WorldCom may have a corresponding claim against Block or its Affiliates
under the CompuServe Agreement, AOL shall cooperate with and assist WorldCom
(with WorldCom being responsible for the payment of any related out-of-pocket
expenses) reasonably incurred by AOL in connection with any such claims.

     (c) Notification of Claims.  For the purpose of this Section 5.2, the
term "Indemnifying Party" shall mean the party having an obligation hereunder to
indemnify the other party or parties pursuant to this Section 5.2, and the term
"Indemnified Party" shall mean the party having the right to be indemnified
pursuant to this Section 5.2.  Whenever any claim shall arise for
indemnification under this Section 5.2, the Indemnified Party shall promptly
notify the Indemnifying Party in writing of such claim and, promptly after
becoming known, the facts constituting the basis for such claim (in reasonable
detail).  Failure by the Indemnified Party to so notify the Indemnifying Party
shall not relieve the Indemnifying Party of any liability hereunder unless and
only to the extent such failure prejudices the Indemnifying Party.  The WorldCom
Indemnified Parties shall not be entitled to indemnification under Section
5.2(a)(iv) and the AOL Indemnified Parties shall not be entitled to
indemnification under Section 5.2(b)(iii) unless, prior to March 15, 1999, a
WorldCom Indemnified Party has notified AOL, or an AOL Indemnified Party has
notified WorldCom, as the case may be,  in writing in reasonable detail of the
existence of any Losses and Expenses that may reasonably be expected to give
rise to any such indemnification obligation.  Notwithstanding any provision
herein to the contrary, any claim for indemnification related to or arising out
of any ANS Tax matter set forth in Section 6.2(a) and Section 6.2(b) shall be
governed solely by Section 6.2 hereof, any claim for indemnification related to
or arising out of any CompuServe Tax matter incorporated based on Sections
9.2(a) and 9.2(b) to the extent incorporated by reference herein by Section 4.8
shall be governed by the same procedures as set forth in Section 9.2 of the
CompuServe Agreement, substituting WorldCom for Block and AOL for WorldCom.

     (d)  Indemnification Procedures.

          (i) After the giving of notice by an Indemnified Party as required by
     paragraph (c) of any claim or the commencement of any action by a Person or
     Governmental Entity who is not a party to this Agreement or an Affiliate of
     such a party (a "Third-Party Claim"), if the Indemnifying Party undertakes
     to defend any such claim, it shall be required to take control of the
     defense and investigation with respect to such claim and to employ and
     engage reputable attorneys of its own choice reasonably acceptable to the
     Indemnified Party to handle and defend the same, at the Indemnifying
     Party's cost, risk and expense, upon written notice to the Indemnified
     Party of such election, which notice acknowledges the Indemnifying Party's
     obligation to provide indemnification hereunder. The Indemnifying Party
     shall not settle any Third-Party Claim that is the subject of
     indemnification without the written consent of the Indemnified Party, which
     consent shall not be unreasonably withheld or delayed. The Indemnified
     Party shall cooperate in all reasonable respects with the Indemnifying
     Party and its attorneys in the investigation, trial and defense of any
     lawsuit or action with respect to such claim and any appeal arising
     therefrom (including the filing in the Indemnified

                                       33

 
     Party's name of appropriate crossclaims and counterclaims). In connection
     with any Third-Party Claim, each Indemnified Party shall use reasonable
     efforts to make available to the Indemnifying Party upon written request
     and at reasonable times, its and its subsidiaries' officers, directors,
     employees and agents to act as witnesses to the extent that such persons
     may reasonably be required to be available in connection with any claim
     under this Section 5.2. The Indemnified Party may, at its own cost,
     participate in any investigation, trial and defense of such lawsuit or
     action controlled by the Indemnifying Party and any appeal arising
     therefrom. If there are one or more legal defenses available to the
     Indemnified Party that conflict with those available to the Indemnifying
     Party, the Indemnified Party shall have the right, at the expense of the
     Indemnifying Party, to assume the defense of the lawsuit or action;
     provided, however, that the Indemnified Party may not settle such lawsuit
     or action without the consent of the Indemnifying Party, which consent
     shall not be unreasonably withheld or delayed. Notwithstanding anything to
     the contrary in this paragraph (d)(i), if a Third-Party Claim is for money
     damages asserted in an amount not to exceed $1,000,000 and is principally
     for non-monetary relief that would have a continuing Material Adverse
     Effect on the Indemnified Party, then the Indemnified Party shall be
     entitled to take control of the defense and investigation with respect to
     such claim and to employ and engage reputable attorneys of its own choice
     reasonably acceptable to the Indemnifying Party to handle and defend the
     same, at the Indemnifying Party's cost, risk and expense, upon written
     notice to the Indemnifying Party of such election.



          (ii) If, within a reasonable time following receipt of a notice
     of a Third-Party Claim pursuant to paragraph (d), the Indemnifying Party
     does not undertake to defend any such claim, the Indemnified Party may, but
     shall have no obligation to, contest at the expense of the Indemnifying
     Party to the extent provided in this Section 5.2 any lawsuit or action with
     respect to such claim and the Indemnifying Party shall be bound by the
     result obtained with respect thereto by the Indemnified Party (including
     the settlement thereof without the consent of the Indemnifying Party).

          (iii)  Any claim of indemnification for Losses and Expenses which
     does not result from a Third-Party Claim shall be asserted by written
     notice given by the party claiming a right of indemnification
     ("Indemnitee") to the party from whom indemnification is sought
     ("Indemnitor") specifying in reasonable detail the nature and basis for the
     claim and the Losses and Expenses incurred.  Such Indemnitor shall have a
     period of 30 days after the receipt of such notice within which to respond
     thereto.  If the Indemnitor does not respond within such 30-day period,
     such Indemnitor shall be deemed to have refused to accept responsibility to
     make payment.  If such Indemnitor does not respond within such 30-day
     period or rejects such claim in whole or in part, the Indemnitee shall be
     free to pursue such remedies as may be available to such party, under
     applicable law or under this Agreement.

          (iv) If the amount of any Losses and Expenses shall, at any time
     subsequent to the payment required by this Agreement, be reduced by
     recovery, settlement, insurance 

                                       34

 
     proceeds or otherwise, the amount of such reduction, less any expenses
     incurred in connection therewith, shall promptly be repaid by the
     Indemnitee to the Indemnitor.

     (e) Tax-Related Adjustment.  An indemnity payment otherwise due and payable
hereunder (i) shall be decreased (but not below zero) to the extent of any net
actual reduction in federal income Tax liability that is actually realized by
the Indemnified Party at the time of its payment of an indemnifiable loss and
(ii) shall be increased to indemnify the Indemnified Party for any additional
federal income Taxes payable by the Indemnified Party by reason of the receipt
or accrual of such indemnity payment.

     5.3 No Contribution. AOL, for itself and on behalf of the AOL Entities,
waives, and acknowledges and agrees that it and they will not have and will not
exercise or assert (or attempt to exercise or assert), any right of
contribution, right of subrogation, right of indemnity or other similar right or
remedy against ANS and the ANS Entities with respect to any action or failure to
act by any AOL Entity, including ANS and the ANS Entities, occurring prior to
the Effective Time in connection with any actual or alleged breach of any
representation, warranty, covenant or other obligation or agreement set forth in
this Agreement or any Losses or Expenses referred to in Section 5.2 or Section
6.2.

     5.4 Access to Information. Subject to the provisions of the Confidentiality
Agreement, between the date hereof and the Closing Date, each of AOL and
WorldCom and their respective Entities shall (i) give to each such other party
and its counsel, accountants and other representatives reasonable access, at
reasonable times and after reasonable notice, to all the properties, documents,
contracts, personnel files (subject to applicable law) and other records of such
party reasonably related to the transactions contemplated hereby; (ii) furnish
the other party with copies of such documents and with such information with
respect to the affairs of such party as the other party may from time to time
reasonably request; and (iii) shall disclose and make available to each such
party and its representatives all books, contracts, accounts, personnel records,
letters of intent, papers, records, communications with regulatory authorities
and other documents relating to the business and operations of such party, to
the extent appropriate to AOL's and WorldCom's respective interests in the
transactions contemplated hereby. Nothing contained in this Section 5.4 shall be
deemed to create any duty or responsibility on the part of either party to
investigate or evaluate the value, validity or enforceability of any contract,
lease or other asset included in the Assets of the other party. With respect to
matters as to which any party has made express representations or warranties
herein, the parties shall be entitled to rely upon such express representations
and warranties without regard to any investigations made by such parties. None
of the parties hereto shall have any liability to any other party hereto
resulting from the sharing with such other party of any information obtained in
the course of the due diligence review by the parties relating to CompuServe,
the CompuServe Entities or the CompuServe Assets, or resulting from any
inaccuracy in any such information.

     5.5 Confidentiality. AOL and WorldCom acknowledge and confirm that they
have entered into a letter agreement dated August 14, 1997 by and among AOL,
WorldCom and CompuServe (the "Confidentiality Agreement") and that the
Confidentiality Agreement shall remain in full force and effect in accordance
with its terms, notwithstanding AOL's and

                                       35

 
WorldCom's entering into this Agreement and whether or not the transactions
contemplated by this Agreement are consummated or terminated.

     5.6  HSR Act Compliance, Etc.
 
     (a) AOL and WorldCom shall promptly make their respective filings, and
shall thereafter use their best efforts to promptly make any required
submissions, under the HSR Act with respect to the transactions contemplated
hereby.  AOL and WorldCom shall use their respective reasonable efforts to
promptly make all other required submissions with respect to all other permits,
authorizations, consents and approvals from third parties and Governmental
Entities necessary to consummate the transactions contemplated by this
Agreement.

     (b) AOL and WorldCom also agree to take any and all of the following
actions to the extent necessary to obtain the approval of any Governmental
Entity with jurisdiction over the enforcement of any applicable laws regarding
the transactions contemplated by this Agreement: entering into negotiations;
providing information; substantially complying with any second request for
information pursuant to the HSR Act or any similar foreign antitrust law; and
making proposals.  The parties hereto will consult, consistent with their
respective legal obligations, and cooperate with each other, and consider in
good faith the views of each other, in connection with any analyses,
appearances, presentations, memoranda, briefs, arguments, opinions and proposals
made or submitted by or on behalf of any party hereto in connection with
proceedings under or relating to the HSR Act or any other federal, state or
foreign antitrust or fair trade law.

     5.7 Public Disclosures. AOL and WorldCom shall consult with each other
before issuing any press release or otherwise making any public statement with
respect to the transactions contemplated by this Agreement, and shall not issue
any such press release or make any such public statement prior to such
consultation except as may be required by applicable law or requirements of the
Exchange Act, NASDAQ or any national securities exchange as advised by counsel,
in which case the parties shall use their reasonable efforts to consult with
each other prior to issuing such a release or making such a statement. WorldCom
and AOL each shall issue a press release and may issue a mutually acceptable
joint press release, promptly upon execution and delivery of this Agreement.

     5.8 Resignation of Directors and Officers. At or prior to the Closing, ANS
shall deliver to WorldCom if and as requested by WorldCom evidence satisfactory
to WorldCom of the resignation of the directors and officers, solely in their
capacities as such, of ANS and any ANS Entity, such resignations to be effective
at the Closing.

     5.9 Notification of Certain Matters. AOL and ANS shall give prompt notice
to WorldCom, and WorldCom shall give prompt notice to AOL and ANS, of (a) the
occurrence, or non-occurrence of any event the occurrence or non-occurrence of
which would or could reasonably be expected to cause any representation or
warranty respectively made by them and contained in this Agreement to be untrue
or inaccurate at or prior to the Closing, as the case may be, and (b) any
failure of AOL, ANS or WorldCom, as the case may be, to comply with or satisfy
any covenant, agreement or condition to be complied with or satisfied by it
hereunder; provided, 

                                       36

 
however, that the delivery of any notice pursuant to this Section 5.9 shall not
limit or otherwise affect the remedies available hereunder to the party
receiving such notice.

     5.10  No Solicitation.

     (a) Neither AOL nor ANS shall, nor shall AOL permit any AOL Entity or
authorize or permit any officer, director or employee, investment banker,
attorney, agent or other advisor or representative of any of them to (i)
initiate, solicit, or encourage, directly or indirectly, the submission of, any
ANS Competitive Proposal, or (ii) participate in any discussions or negotiations
regarding, or furnish to any person or entity any information with respect to,
or take any other action to facilitate knowingly the making of any proposal that
constitutes, or may reasonably be expected to lead to, an ANS Competitive
Proposal.  For purposes of this Agreement, an "ANS Competitive Proposal" means
any inquiry, proposal or offer from any Person relating to any direct or
indirect acquisition or purchase of all or a significant part of the stock or
assets of ANS or any ANS Entity or of the ANS Network Services Business or any
merger, consolidation, business combination, recapitalization, liquidation,
dissolution or similar transaction involving ANS or any ANS Entity, other than
the transactions contemplated by this Agreement.

     (b) AOL and ANS shall advise WorldCom of any request for information
from it or the receipt by it of any ANS Competitive Proposal within 24 hours of
such request or receipt, describing in reasonable detail the information
requested, the material terms and conditions of such request or proposal, and
the identity of the Person making any such request or proposal.

     (c) Immediately upon the execution of this Agreement, AOL and ANS shall
cease any ongoing discussions or negotiations with any parties previously
conducted with respect to any actual or potential ANS Competitive Proposal and
request each Person which has heretofore executed a confidentiality agreement in
connection with its consideration of an ANS Competitive Proposal to return or
destroy all confidential information heretofore furnished to such Person by or
on behalf of AOL or ANS.

     (d) WorldCom shall not, nor shall it permit any WorldCom Entity or
authorize or permit any officer, director or employee, investment banker,
attorney, agent or other advisor or representative of any of them to (i)
initiate, solicit, or encourage, directly or indirectly, the submission of, any
WorldCom Competitive Proposal, or (ii) participate in any discussions or
negotiations regarding, or furnish to any Person any information with respect
to, or take any other action to facilitate knowingly the making of any proposal
that constitutes, or may reasonably be expected to lead to, a WorldCom
Competitive Proposal.  For purposes of this Agreement, a "WorldCom Competitive
Proposal" means any inquiry, proposal or offer from any Person relating to any
direct or indirect acquisition or purchase of all or a significant part of the
CompuServe Online Services Business, other than WorldCom's indirect acquisition
thereof pursuant to the CompuServe Agreement.

     (e) WorldCom shall advise AOL of any request for information from it
or the receipt by it of any WorldCom Competitive Proposal within 24 hours of
such request or receipt, 

                                       37

 
describing in reasonable detail the information requested, the material terms
and conditions of such request or proposal, and the identity of the Person
making any such request or proposal.

     (f) Immediately upon the execution of this Agreement, WorldCom shall
cease any ongoing discussions or negotiations with any parties previously
conducted with respect to any actual or potential WorldCom Competitive Proposal
and request each Person which has heretofore executed a confidentiality
agreement in connection with its consideration of a WorldCom Competitive
Proposal to return or destroy all confidential information heretofore furnished
to such Person by or on behalf of WorldCom.

     5.11 Other Actions. Unless such action or omission is required by
applicable law, neither AOL nor ANS nor WorldCom shall knowingly or
intentionally take any action or omit to take any action, if such action or
omission would, or reasonably might be expected to, result in any of the
representations and warranties set forth herein being or becoming untrue or
inaccurate or any of the conditions to the Closing set forth in this Agreement
not being satisfied, or would adversely affect the ability of AOL, ANS, or
WorldCom to obtain any consents or approvals required of it for the consummation
of the transactions contemplated by this Agreement, without imposition of a
condition or restriction which would have a Material Adverse Effect, or would,
or might reasonably be expected to, otherwise materially impair the ability of
AOL, ANS or WorldCom to consummate the transactions contemplated by this
Agreement, in accordance with the terms of this Agreement or materially delay
any such consummation. The foregoing shall not limit WorldCom's ability to
exercise its rights under the CompuServe Agreement.

     5.12 Cooperation. Each of AOL, ANS and WorldCom shall use its best efforts
(i) to cooperate with each other in determining whether any filings are required
to be made or consents are required to be obtained in any jurisdiction prior to
the Closing, in connection with the consummation of the transactions
contemplated hereby and cooperate in making any such filings promptly and in
seeking to obtain any such consents in a timely manner, (ii) to take, or cause
to be taken, all actions necessary to comply promptly with all legal
requirements which may be imposed by agency or court order on such party (or any
subsidiaries or other Affiliates of such party) with respect to this Agreement,
and (iii) to take, or cause to be taken, all actions necessary to obtain (and to
cooperate with the other party to obtain) any consent, authorization, order or
approval of, or any exemption by, any Governmental Entity and/or any other
public entity which is required to be obtained or made by such party or of the
ANS Entities or other Affiliates in connection with this Agreement and the
transactions contemplated hereby.

     5.13  ANS and ANS Network Services Business Employees.

     (a) All current employees of ANS and the ANS Entities ("ANS Employees") as
of the Closing shall be employed or offered employment, immediately after the
Effective Time, by ANS or another WorldCom Entity. At and after the Effective
Time, WorldCom shall honor, and cause ANS to honor, all provisions of all
employment or severance agreements or plans (excluding stock option or award
plans, which are separately addressed in Section 1.8) in effect for ANS
Employees (or any former employee of ANS or any ANS Entity that would have been
an ANS Employee had he or she been employed by ANS, an ANS Entity or AOL on the
Closing

                                       38

 
Date) as of the Closing. Schedule 5.13 is a complete list of all ANS Employees
and all such employment and severance agreements and plans existing as of the
date hereof (the "Schedule 5.13 Agreements"), true and complete copies of which
have been provided to WorldCom. Notwithstanding the foregoing, at any time after
the Closing, the employment of any ANS Employee may be terminated and any
Schedule 5.13 Agreement may be amended or terminated in accordance with its
terms.

     (b) WorldCom, following the Closing Date, shall permit such ANS Employees
who are retained as employees of ANS or any ANS Entity or become WorldCom
employees thereafter and who were participating in AOL or ANS Benefit Plans
immediately prior to the Closing Date, to participate in corresponding employee
compensation and benefit plans, programs, policies and fringe benefits of
WorldCom in accordance with the eligibility criteria thereof (it being
understood that such plans, programs, policies and fringe benefits after the
Closing will be those of WorldCom immediately before the Closing, as such plans,
programs, policies or fringe benefits may thereafter be amended, terminated,
discontinued or supplemented).  In so doing, WorldCom shall credit prior service
of ANS Employees with ANS or any AOL Entity, as applicable, for purposes of
determining the vesting, eligibility, waiting periods or qualification of or
participation of such employees under WorldCom's benefit programs and any
successor benefit programs to the extent that such prior service was recognized
under such ANS Benefit Plans (which shall include vacation pay plans but shall
not include stock option or award plans); such prior service credited under a
WorldCom benefit program shall include service with other entities to the extent
that such service is credited by ANS or any AOL Entity for purposes of any ANS
Benefit Plan similar to such WorldCom benefit plan.  Notwithstanding the
preceding sentence, WorldCom may continue (or cause ANS to continue after the
Closing) the participation by ANS employees in one or more of the ANS Benefit
Plans, and WorldCom will be deemed to have satisfied its obligations under this
Section 5.13(b) with respect to the type of benefits provided under such ANS
Benefit Plan(s).

     5.14  ANS Name.  AOL acknowledges that the name "ANS," whether alone or in
combination with one or more other words, will be an asset solely of ANS or the
ANS Entities immediately following the Closing.  Nothing in this Agreement shall
reserve a license or constitute a retention or transfer of rights in or with
respect to the word "ANS" to AOL or any other Person (except ANS and the ANS
Entities) after the Closing and neither AOL nor any such other Person acting by
or through any grant or right from AOL shall use or purport to use, license or
otherwise transfer the word "ANS" for any business purpose after the Closing.
Following the Closing, AOL agrees to take all actions and to execute all
documents and certificates as WorldCom may reasonably request to effectuate the
intention of this Section 5.14.

     5.15 CompuServe Name. WorldCom and AOL are entering into an agreement
contemporaneously with the signing of this Agreement (the "Agreement to Form
Business Entity"), providing that both WorldCom and AOL shall form an entity to
hold, maintain, license and defend rights to the use of the CompuServe name,
with WorldCom and its Affiliates having rights of use in the network services
business, and with AOL and its Affiliates having rights of use in the online
services business.

                                       39

 
     5.16 Noncompetition and Nonsolicitation Agreement. Subject to the
satisfaction of the conditions to its obligations in Article VII, below, AOL
shall execute and deliver to WorldCom at Closing, without further consideration,
an agreement in substantially the form attached hereto as Exhibit E (the
"Noncompetition and Nonsolicitation Agreement").

     5.17 Key-Employee Nondisclosure and Nonsolicitation Agreements. AOL shall
use its best efforts to obtain, at or prior to the Closing, duly executed
nondisclosure and nonsolicitation agreements in substantially the form attached
as Exhibit F (the "Key Employee Agreements") (unless signed prior to the
execution of this Agreement) from the significant employees, officers and
directors of ANS and the ANS Entities designated by WorldCom in writing.

     5.18 Board Seat. Promptly after the Effective Time, WorldCom shall cause
the current Chief Executive Officer of AOL, if he so requests within thirty days
after the date hereof, to be appointed to the Board of Directors of WorldCom.

     5.19 Services Agreements. AOL and WorldCom shall execute and deliver to
each other at the Closing (a) a services agreement in substantially the form
attached hereto as Exhibit G (the "Transition Services Agreement") and (b)
network services agreements in substantially the forms attached hereto as
Exhibits H and I (the "Network Services Agreements").

     5.20 Status of Title to the CompuServe Assets. WorldCom and the WorldCom
Entities shall not cause any lien, encumbrance or other defect in title to any
of the CompuServe Assets to be created prior to the transfer thereof to AOL or
its designee or designees at the Closing.

     5.21 Delivery of ANS Shares. AOL shall deliver the ANS Shares, at the
Closing, to WorldCom (or to CompuServe if directed by WorldCom) free and clear
of all Liens and Other Encumbrances.


     5.22 Consummation of Merger. WorldCom shall use all reasonable efforts to
cause the conditions to closing under the CompuServe Agreement to be satisfied,
including the exercise of proxy or option rights which may be granted to
WorldCom in connection with the CompuServe Agreement; provided, that this
Section shall not be deemed to require WorldCom (i) to waive any substantive
rights, or (ii) to incur any substantial expense or obligation not otherwise
required of it, or (iii) to cause the Merger or related transactions to proceed
on terms which do not preserve the overall business and economic objectives of
WorldCom as evidenced by this Agreement and the CompuServe Agreement. In
addition, WorldCom shall cause WAC to consummate the Merger if all conditions to
such Merger shall have been satisfied or waived in accordance with the terms of
the CompuServe Agreement.

     5.23 Covenants Relating to CompuServe Online Services Business. WorldCom
shall cause Block , the Block Entities (as defined in the CompuServe Agreement),
CompuServe and the CompuServe Entities to perform their respective covenants and
agreements set forth in the CompuServe Agreement as in effect on this date, to
the extent that any of the foregoing may affect the CompuServe Assets, the
CompuServe Online Services Business or the rights of AOL hereunder.

                                       40

 
     5.24 Exercise of Option; Negotiation Period. In the event that WorldCom
becomes entitled to exercise the option (the "Option") granted to it pursuant to
the Stockholders Agreement (as such term is defined in the CompuServe
Agreement), WorldCom and AOL shall negotiate with each other in good faith, for
so long as the Option remains exercisable and , if the Option is exercised by
WorldCom, for 180 days following such exercise (the "Negotiation Period") with
the goal of entering into agreements and arrangements and engaging in
transactions which would, as closely as would be commercially reasonable at that
time and in accordance with applicable law (and taking into account the changed
facts and circumstances as they exist at that time), effectuate the intent and
purposes of this Agreement and the transactions contemplated hereby. During the
Negotiation Period, AOL and WorldCom shall each comply with the provisions of
Sections 5.4 and 5.10.

                                   ARTICLE VI

                                  TAX MATTERS

     6.1 Section 338 Election. (a) The parties intend that the acquisition of
ANS by WorldCom will constitute a qualified stock purchase within the meaning of
Section 338(d)(3) of the Code. At the request of WorldCom, AOL (as the common
parent of the selling consolidated group within the meaning of Section
338(h)(10) of the Code), WorldCom, and ANS shall jointly make timely and
irrevocable elections under Section 338(h)(10) of the Code (which elections
shall be made with respect to ANS and each of the eligible ANS Entities
requested by WorldCom) and, if permissible, similar elections under any
applicable state, local or foreign income tax laws (jointly, the "Elections").
To the extent WorldCom has requested an Election, AOL agrees to report the
transfer of ANS Shares (and the deemed sale of the shares of the affected ANS
Entities) under this Agreement consistent with such Election and agrees not to
take any action that could cause such Election to be invalid, and shall take no
position contrary thereto unless required to do so pursuant to a determination
(as defined in Section 1313(a) of the Code or any similar state, local or
foreign tax provision).

     (b)  To the extent WorldCom has requested an Election:

          (i) To the extent possible, WorldCom, AOL, and ANS agree to execute at
     the Closing any and all forms necessary to effectuate the Election
     (including Internal Revenue Service Form 8023-A and any similar forms under
     applicable state, local or foreign income tax laws (the "Section 338
     Forms")).  In the event, however, any Section 338 Forms are not executed at
     the Closing, WorldCom, AOL and ANS agree to prepare and complete each such
     Section 338 Form no later than ten (10) Business Days prior to the date
     such Section 338 Form is required to be filed.  AOL and WorldCom shall each
     cause the Section 338 Forms to be duly executed by an authorized person for
     AOL and WorldCom, in each case, and shall duly and timely file the Section
     338 Forms in accordance with applicable tax laws and the terms of this
     Agreement.

          (ii) As soon as practicable after the Closing Date, WorldCom shall
     deliver to AOL a written notice setting forth (with reasonable specificity)

                                       41

 
     WorldCom's good faith calculation of (1) the Modified Aggregate Deemed
     Sales Price (as defined below) and the allocation thereof among the assets
     of ANS and of the affected ANS Entities in accordance with the principles
     of Treasury Regulation (S) 1.338(h)(10)-1(f)(1)(ii) and (2) the adjusted
     grossed-up basis of the assets of ANS and of the assets of the affected ANS
     Entities pursuant to Treasury Regulation (S) 1.338(h)(10)-1(e)(5) (the
     "Deemed Purchase Price") (collectively, "Buyer's Allocation").  Within 20
     Business Days after receipt thereof, AOL shall deliver to WorldCom written
     notice indicating whether AOL agrees or disagrees with Buyer's Allocation.
     If AOL agrees with Buyer's Allocation or if AOL fails to deliver such
     written notice within such 20 Business Days, Buyer's Allocation shall
     constitute the "Agreed Allocation."  If AOL provides timely written notice
     to WorldCom of any disagreement with Buyer's Allocation, the Agreed
     Allocation shall be determined through the Tax Settlement Procedure.
     Except as determined to the contrary by the appropriate taxing authority
     upon an audit of its (or its Affiliates') Tax Returns, each of AOL, ANS and
     the affected ANS Entities shall file all Tax Returns consistent with the
     Agreed Allocation.  For purposes of this Section 6.1, the term "Modified
     Aggregate Deemed Sales Price" shall mean the amount resulting from the
     Elections, determined pursuant to Treasury Regulation (S) 1.338(h)(10)-1(f)
     without regard to items described in Treasury Regulation (S) 1.338(h)(10)-
     1(f)(4)(ii) (it being understood that AOL may take such items into account
     in filing Tax Returns).

     (c) For purposes of this Agreement, the "Tax Settlement Procedure" is as
follows:

     Upon receipt by AOL or by WorldCom, as the case may be (the "Calculating
Party"), of notice from the other party (the "Disputing Party") of disagreement
with any Tax calculation or determination supplied by the Calculating Party, the
Calculating Party and the Disputing Party shall begin good faith negotiations to
resolve such disagreement.  If the Calculating Party and the Disputing Party are
able to resolve such disagreement within ten (10) Business Days after the
Calculating Party's receipt of notice of disagreement (or any longer period
mutually agreed to by the parties), the relevant amount will become the amount
agreed upon by the Calculating Party and the Disputing Party.  If the
Calculating Party and the Disputing Party are unable to resolve any disagreement
within ten (10) Business Days after the Calculating Party's receipt of notice of
disagreement, the Calculating Party and the Disputing Party shall jointly
request the Tax Settlement Auditor referred to below to resolve any issue in
dispute as soon as possible and shall cooperate with the Tax Settlement Auditor
to resolve such dispute.  The Tax Settlement  Auditor shall be the national
office of Price Waterhouse; provided that if, Price Waterhouse shall, at the
time, be serving as the independent public accountants of either WorldCom or AOL
or shall otherwise have a material relationship with either of them, then the
Tax Settlement Auditor shall be the national office of KPMG Peat Marwick, or, if
KPMG Peat Marwick shall have such a material relationship, the national office
of another accounting firm mutually satisfactory to WorldCom and AOL. The Tax
Settlement Auditor shall make a determination with respect to all disputed
issues, which determination shall be set forth in a written report delivered to
the Calculating Party and the Disputing Party.  The Calculating Party and the
Disputing Party shall each pay one-half of the fees and expenses of the Tax
Settlement Auditor with respect to such determination.

                                       42

 
     6.2  Tax Indemnification. (a) AOL and the AOL Entities (other than ANS and
the ANS Entities) jointly and severally shall be responsible for, shall pay or
cause to be paid, and shall indemnify and hold harmless WorldCom and any
WorldCom affiliates and, after the Closing, ANS and the ANS Entities and each of
their respective successors-in-interest from and against any and all Losses and
Expenses for or in respect of each of the following:

          (i) Any and all Taxes with respect to any taxable period of ANS or any
     of the ANS Entities (or any predecessor) ending on or before the Closing
     Date (including any and all Taxes arising as a result of the Elections),
     but excluding any transactions occurring after the Closing (other than the
     Elections) which are not related to the transfer of ANS Shares and the
     other transactions contemplated by this Agreement ("Excluded
     Transactions");

          (ii) Any and all Taxes resulting from ANS or any of the ANS Entities
     (or any predecessor) having been (or ceasing to be) included in any
     affiliated, consolidated, combined or unitary Tax Return that included ANS
     or any of the ANS Entities (or any predecessor) for any taxable period (or
     portion thereof) ending on or before the Closing Date (including any
     liability for Taxes resulting from an acceleration of an "intercompany
     transaction" within the meaning of Treasury Regulation (S) 1.1502-13(d),
     any deferred income triggered by Treasury Regulation (S) 1.1502-14, and any
     excess loss accounts taken into income under Treasury Regulation (S)
     1.1502-19 or any analogous or similar provisions under state, local or
     foreign law or any predecessor provision or regulation) that occurred on or
     before the Closing Date (but excluding the Excluded Transactions);

          (iii)  Any and all Taxes of any member of an affiliated, consolidated,
     combined or unitary group (other than ANS or any ANS Entity) of which ANS
     or any ANS Entity (or any predecessor) is or was a member on or prior to
     the Closing Date, by reason of the liability of ANS or any ANS Entity (i)
     pursuant to Treasury Regulation (S) 1.1502-6(a) or any analogous or similar
     state, local or foreign law or regulation, (ii) as a transferee or
     successor, or (iii) by contract or otherwise (including under any Tax
     sharing, Tax indemnity, Tax allocation or similar contracts (whether or not
     written) to which ANS or any of the ANS Entities, any predecessor of ANS or
     any of the ANS Entities, or any transferor to ANS or any of the ANS
     Entities, is a party or is obligated thereunder;

          (iv) Any and all Employment and Withholding Taxes;

          (v) To the extent not previously paid, any and all real property Taxes
     allocable to ANS or any ANS Entity (or any predecessor) pursuant to Section
     6.2(c) hereof (excluding real property Taxes resulting from the Excluded
     Transactions and any increase in real property Taxes arising from a
     revaluation of the property as a result of the sale of ANS Shares or the
     Elections);

          (vi) Any and all Taxes allocable to AOL, ANS or any ANS Entity
     pursuant to Section 6.2(c) hereof and not previously paid thereunder; and

                                       43

 
          (vii)  Any breach by AOL or any AOL Entity of any representation,
     warranty or covenant contained in Section 3.10 or Section 6.2.

     (b) WorldCom agrees to indemnify and hold harmless AOL and the other AOL
Entities from and against (and AOL and the other AOL Entities shall have no
liability under Section 6.2(a) on account of) any and all Losses and Expenses
for or in respect of any and all Taxes of ANS or any of the ANS Entities (or any
predecessor) that are not described in Section 6.2(a) (including Taxes resulting
from an Excluded Transaction), except for such Taxes arising from a breach of a
representation or warranty contained in Section 3.10, to the extent such
representation or warranty has not expired pursuant to Section 5.2.

     (c) AOL and WorldCom shall, to the extent permitted by applicable law,
elect with the relevant taxing authority to close the taxable period of ANS and
the ANS Entities on the Closing Date.  In any case where applicable law does not
permit ANS or any ANS Entity to close its taxable year on the Closing Date (and
in the case of Taxes described in Section 6.2(a)(v)), Taxes attributable to the
taxable period of ANS or a ANS Entity beginning on or before and ending after
the Closing Date shall be allocated (i) to AOL for the period up to and
including the Closing Date (excluding any Excluded Transaction and any increase
in real property Taxes arising from a revaluation of the property as a result of
the sale of ANS Shares or the Elections), and (ii) to WorldCom for the period
subsequent to the Closing Date (including any Excluded Transaction and any
increase in real property Taxes arising from a revaluation of the property as a
result of the sale of ANS Shares or the Elections).  Any allocation required to
determine any Taxes attributable to any period beginning on or before and ending
after the Closing Date (including any Taxes resulting from a Tax audit or
administrative or court proceeding) shall be made by means of a closing of the
books and records of ANS and the ANS Entities as of the close of business on the
Closing Date, excluding any Excluded Transaction, and, to the extent not
susceptible to such allocation, by apportionment on the basis of elapsed days,
except that extraordinary items described in Treasury Regulation (S) 1.1502-
76(b)(2)(ii)(C) shall be allocated to the day that they are taken into account.
Real property Taxes (excluding those arising from any Excluded Transaction and
any increase in such Taxes arising from a revaluation of the property as a
result of the sale of ANS Shares or the Elections) shall be allocated on the
basis of elapsed days.

     (d)  (i)  Promptly after receipt by WorldCom, ANS or any of the ANS
     Entities of written notice of the assertion or commencement of any claim,
     audit, examination, or other proposed change or adjustment by any taxing
     authority concerning any Tax covered by Section 6.2(a) (each a "Tax
     Claim"), WorldCom shall notify AOL.  Such notice shall contain factual
     information (to the extent known by WorldCom, ANS or any of the ANS
     Entities) describing the asserted Tax Claim in reasonable detail and shall
     include copies of any notice or other document received from any taxing
     authority in respect of any such asserted Tax Claim.  The failure of
     WorldCom to give AOL prompt notice as provided herein shall not relieve AOL
     of any of its obligations under Section 6.2, except to the extent that AOL
     is materially prejudiced by such failure.

                                       44

 
          (ii) AOL shall promptly notify WorldCom of the commencement of any
     claim, audit, examination or other proposed change or adjustment by any
     taxing authority which could reasonably be expected to affect the liability
     of ANS or any of the ANS Entities for Taxes.  Such notice shall contain
     factual information (to the extent known by AOL or any AOL Entity)
     describing the asserted Tax Claim in reasonable detail and shall include
     copies of any notice or other document received from any taxing authority
     in respect of any such asserted Tax Claim. The failure of AOL to give
     WorldCom prompt notice as provided herein shall not relieve WorldCom of any
     of its obligations under Section 6.2, except and only to the extent that
     WorldCom or any of the WorldCom Entities (including ANS and any of the ANS
     Entities) is materially prejudiced by such failure.

          (iii)  AOL shall have the sole right to represent ANS's or any of the
     ANS Entities' interests in any Tax audit or administrative or court
     proceeding relating to any Tax covered by Section 6.2(a) and to employ
     counsel of its choice, provided that (A) with respect to any taxable period
     referred to in Sections 6.2(a)(v) or (vi) hereof or ending after the
     Closing Date or (B) if the results of such Tax audit or proceeding could
     reasonably be expected to be material to WorldCom, ANS, or their Affiliates
     for any taxable period including or ending after the Closing Date, then AOL
     and WorldCom shall jointly control the defense and settlement of any such
     Tax audit or proceeding and each party shall cooperate with the other party
     at its own expense and there shall be no settlement or closing or other
     agreement with respect thereto without the consent of the other party,
     which consent shall not be unreasonably withheld provided; however, for a
     Tax audit or proceeding with respect to any Seller Consolidated and
     Combined Return, WorldCom shall only be entitled to participate actively
     with respect to those issues as to which they have an interest and not
     control jointly the settlement of the entire audit.  AOL shall promptly
     notify WorldCom if it decides not to control the defense or settlement of
     any such Tax audit or administrative or court proceeding and WorldCom
     thereupon shall be permitted to defend and settle such Tax audit or
     proceeding.

     (e)  (i)  AOL shall properly prepare or cause to be properly prepared, and
     shall timely file or cause to be timely filed, (x) all Tax Returns which
     include ANS or any ANS Entities required to be filed on or before the
     Closing Date, and (y) all Tax Returns which include ANS or any ANS Entities
     or their assets or operations for all taxable periods of ANS and of the ANS
     Entities ending on or before the Closing Date (which Tax Returns shall
     include ANS and the ANS Entities and the reportable items from the assets
     or operations of ANS and the ANS Entities through and including the Closing
     Date).  Such Tax Returns (insofar as they relate to ANS or any of the ANS
     Entities) shall be prepared in a manner consistent with past practices and
     prior audit adjustments and AOL shall pay or cause to be paid all Taxes
     shown as due on such Tax Returns or otherwise levied or assessed upon ANS
     or any of the ANS Entities or any of their assets on or prior to the
     Closing Date.  Insofar as they relate to ANS and the ANS Entities, such Tax
     Returns shall be provided to WorldCom for WorldCom's review and comment 20
     Business Days prior to filing, and WorldCom shall be entitled to suggest to
     AOL any reasonable changes to such Tax Returns, which suggestions may be

                                       45

 
     rejected by AOL in its discretion.  Any disagreement between the parties
     will be resolved through the Tax Settlement Procedure.  AOL shall,
     subsequent to the Closing Date, provide written notice to AOL of its intent
     to file any amended Tax Return or claim for refund with respect to any
     taxable period ending on or prior to the Closing Date that could reasonably
     be expected to be material to WorldCom, ANS, or their Affiliates for any
     taxable period including or ending after the Closing Date, and AOL shall
     not make such filing without the consent of WorldCom, which consent shall
     not be unreasonably withheld.

          (ii) Except as set forth in clause (i) above, WorldCom shall be
     responsible for the filing and payment (subject to WorldCom's right to
     indemnification to the extent provided in Section 6.2(a)) of all other Tax
     Returns required to be filed after the Closing Date by or on behalf of ANS
     and any of the ANS Entities, or with respect to their assets and
     operations. WorldCom shall, subsequent to the Closing Date, provide written
     notice to AOL of its intent to file any amended Tax Return that could
     reasonably be expected to be material to AOL, and WorldCom shall not make
     such filing without the consent of AOL, which consent shall not be
     unreasonably withheld.

          (iii)  With respect to any Tax Return required to be filed by WorldCom
     for a taxable period of ANS or any of the ANS Entities beginning on or
     before the Closing Date and ending after the Closing Date, WorldCom shall
     deliver, at least 20 Business Days prior to the due date for filing such
     Tax Return (including extensions), to AOL a statement setting forth the
     amount of Tax allocated to AOL pursuant to Section 6.2(c), (the "Tax
     Statement") and copies of such Tax Returns, and WorldCom shall cause ANS
     and the ANS Entities to pay all Taxes shown as due on such Tax Returns. AOL
     shall have the right to review such Tax Return and the Tax Statement prior
     to the filing of such Tax Return and to suggest to WorldCom any reasonable
     changes to such Tax Returns.  Any disagreement between the parties will be
     resolved through the Tax Settlement Procedure.  If the Tax Settlement
     Auditor is unable to make a determination with respect to any disputed
     issue within five (5) Business Days prior to the due date (including
     extensions) for the filing of the Tax Return in question, then WorldCom may
     file such Tax Return on the due date (including extensions) therefor
     without such determination having been made and without AOL's consent.
     Notwithstanding the filing of such Tax Return, the Tax Settlement Auditor
     shall make a determination with respect to any disputed issue, and the
     amount of Taxes that are allocated to AOL pursuant to Section 6.2(c) or
     Section 6.2(a)(v), as the case may be, shall be as determined by the Tax
     Settlement Auditor.  The fees and expenses of the Tax Settlement Auditor
     shall be paid one-half by WorldCom, on the one hand, and one-half by AOL,
     on the other.  Nothing in this Section 6.2(e)(iii) shall excuse AOL from
     its indemnification obligations pursuant to Section 6.2 hereof if the
     amount of Taxes as ultimately determined (on audit or otherwise), for the
     periods covered by such Tax Returns and which are allocable to AOL pursuant
     to Section 6.2(c) or Section 6.2(a)(v), as the case may be, exceeds the
     amount determined under this Section 6.2(e)(iii).

          (iv) AOL and WorldCom shall cooperate fully with each other and make
     available to each other in a timely fashion such Tax data and other

                                       46

 
     information as may be reasonably required by AOL or WorldCom for the
     preparation and timely filing of any Tax Returns required to be prepared
     and filed by AOL or WorldCom hereunder, or in connection with the
     preparation or filing of any election, claim for refund, consent or
     certification.

     (f) AOL and WorldCom shall provide to each other, and WorldCom shall cause
ANS and the ANS Entities to provide to AOL, full access, at any reasonable time
and from time to time, at the business location at which the books and records
are maintained, after the Closing Date, to such Tax data of ANS and the ANS
Entities as AOL or WorldCom, as the case may be, may from time to time
reasonably request and shall furnish, and request the independent accountants
and legal counsel of AOL, WorldCom, ANS and the ANS Entities to furnish to AOL,
WorldCom, ANS or the ANS Entities as the case may be, such additional Tax and
other information and documents in the possession of such persons as AOL,
WorldCom, ANS or the ANS Entities may from time to time reasonably request.

     (g) Any claim for indemnity hereunder may be made at any time prior to 60
Business Days after the expiration of the applicable Tax statute of limitations
with respect to the relevant taxable period (including all extensions obtained,
whether automatic or permissive).

     (h) The party seeking indemnification or other payment pursuant to this
Section 6.2 shall give the other party written notice of claim for
indemnification or payment, which notice shall include a calculation of the
amount of the requested indemnity or other payment and shall furnish to the
other party copies of all books, records and other information reasonably
requested by the other party to the extent necessary to substantiate such claim
and verify the amount thereof.  If reasonably necessary in order to make or
substantiate a claim (or to determine if a claim should be made), each party
shall be permitted access to the other party's books, records and other
information in connection therewith.  The party requested to make any indemnity
or other payment pursuant to this Section 6.2 shall deliver to the party
requesting payment, within 20 Business Days after receiving both the foregoing
notice and all books, records and other information reasonably requested by it,
a detailed statement describing its objections (if any) thereto.  Any such
objections will be resolved through the Tax Settlement Procedure.

     (i) AOL shall be responsible for, shall pay or cause to be paid, and shall
indemnify and hold harmless WorldCom, ANS, and the ANS Entities, from and
against any Losses and Expenses arising after the Closing Date arising under any
Tax sharing, Tax indemnity, Tax allocation or similar contracts (whether or not
written) to which ANS or any of the ANS Entities, any predecessor of ANS or any
of the ANS Entities, or any transferor to ANS or any of the ANS Entities, is a
party or is obligated thereunder, in each case on or prior to the Closing Date.
None of WorldCom, ANS or any of the ANS Entities shall have any liability
pursuant to any such agreement after the Closing Date.

     6.3 Tax Related Adjustments. (a) AOL and WorldCom agree that any indemnity
payment made under this Agreement shall be treated by the parties on their Tax
Returns as an adjustment to the Purchase Price. If, notwithstanding such
treatment by the parties, any indemnity payment is determined to be taxable to
(i) AOL (other than as an adjustment to the 

                                       47

 
Purchase Price) or (ii) WorldCom, ANS or any ANS Entity, for federal income Tax
purposes by the IRS, the indemnifying party shall indemnify the indemnified
party for any additional federal income Taxes payable by the indemnified party
by reason of the receipt or accrual of such indemnity payment (including any
payments under this Section 6.3).

     (b) An indemnity payment otherwise due and payable hereunder shall be
decreased (but not below zero) to the extent of any net actual reduction in
federal income Tax liability that is actually realized by the indemnified party
at the time of its payment of an indemnifiable loss.

     (c) Except as provided in Section 6.3(d), WorldCom shall pay to AOL, any
refund of any Tax for which AOL is responsible under Section 6.2(a) other than
as a result of a carryback of any credit or deduction from a taxable year ending
after the Closing Date.  WorldCom shall pay to AOL such refund (including
interest received thereon) (reduced by any actual Tax increase or actual Tax
detriment to WorldCom, ANS or any of the ANS Entities as a result of the receipt
thereof, but increased by any actual Tax benefit resulting from such payment)
promptly upon receipt thereof by the recipient thereof.  WorldCom shall, if AOL
requests, cause the relevant entity to file for and obtain any refunds or
equivalent amounts to which AOL is entitled under this Section 6.3(c), and
WorldCom shall permit AOL to principally control the prosecution of any such
refund claim, provided, however, that WorldCom must consent to any such refund
claim, which consent may not be unreasonably withheld, and that any such refund
claim shall be at the sole expense of the AOL.

     (d) AOL agrees that to the extent that ANS or any of the ANS Entities
realizes any Tax attribute after the Closing Date that either is required to be
or optionally may be carried back to a taxable period ending on or prior to the
Closing Date, AOL shall, at WorldCom's sole expense, permit such carryback,
shall cooperate in the filing of any required returns or claims for refund and
shall pay WorldCom any Tax refund received (including interest received thereon)
(reduced by any actual Tax increase or Tax detriment to AOL as a result of the
receipt thereof but incurred by any actual Tax benefit resulting from such
payment) or the amount of any reduction in Taxes so obtained by the Seller Group
(as hereinafter defined); provided, however, in the event that any Tax attribute
generated after the Closing Date by WorldCom, ANS or any ANS Entity or any
member of any affiliated group (or other group filing on a combined basis) of
which any thereof is a member (any of the foregoing being referred to herein as
a "Buyer Group Member") is carried back to a taxable year (or portion thereof)
of AOL's affiliated group (or other group filing on a combined basis of which
ANS or any of the ANS Entities is a member) (the "Seller Group") that ended on
or prior to the Closing Date and, as a result of such carryback, any Tax
attribute generated by the Seller Group (whether in the same year or in a prior
or subsequent year) is not capable of being carried back or forward to the same
extent it would have been had no such Buyer Group carryback occurred, such
refund to WorldCom shall be reduced by an amount sufficient to place the Seller
Group in the same position as it would have been in if no such carryback
occurred (except that AOL shall pay WorldCom (when and as actually realized) any
refund of Taxes or actual reduction of Taxes otherwise payable by the Seller
Group that is subsequently realized by the Seller Group as a result of the
Seller Group's use of any Tax attributes that would otherwise have been utilized

                                       48

 
by the Seller Group earlier had the Tax attribute of WorldCom, ANS or any ANS
Entity (or any other Buyer Group Member) not been so carried back.

     6.4 Transfer Taxes. All transfer, documentary, sales, use, stamp,
registration and other Taxes and fees (including any penalties and interest)
incurred in connection with the effectuation of the transfer of ANS Shares and
the ANS Network Assets to WorldCom shall be paid by AOL when due; and all
transfer, documentary, sales, use, stamp, registration and other Taxes and fees
(including any penalties and interest) incurred in connection with the
effectuation of the transfer of the CompuServe Assets to AOL or its designee or
designees shall be paid by WorldCom when due. The party obligated to pay such
Taxes and fees shall, at its own expense, file all necessary Tax Returns and
other documentation with respect to the applicable transfer, documentary, sales,
use, stamp, registration and other Taxes and fees. If required by applicable
law, WorldCom and AOL will, and will cause their affiliates to, join in the
execution of any such Tax Returns and other documentation prepared by the other.

                                  ARTICLE VII

                             CONDITIONS TO CLOSING

     7.1 Mutual Conditions. The respective obligations of each party to
consummate the Purchase and Sale and the other transactions contemplated hereby
shall be subject to the satisfaction, at or prior to the Closing Date, of the
following conditions:

     (a) Any mandatory waiting period (and any extension thereof) applicable to
the consummation of the Purchase and Sale under the HSR Act shall have expired
or been terminated.

     (b) Any mandatory waiting period (and any extension thereof) applicable to
the consummation of the Purchase and Sale under any foreign competition law or
similar law shall have expired or been terminated.

     (c) The transactions contemplated by the CompuServe Agreement shall have
been consummated.

     7.2 Conditions to Obligations of WorldCom. The obligation of WorldCom to
consummate the Purchase and Sale and the other transactions contemplated hereby
shall be subject to the satisfaction, at or prior to the Closing Date of the
following conditions (any of which may be waived prior to the Closing by
WorldCom):

     (a) The representations and warranties of AOL and ANS set forth in
this Agreement that are qualified by Material Adverse Effect or otherwise as to
materiality shall be true and correct, and those that are not so qualified shall
be true and correct except for failures to be true and correct as would not have
a Material Adverse Effect with respect to ANS or, after the Closing Date, a
Material Adverse Effect with respect to WorldCom or ANS, as of the date of this
Agreement and as of the Closing Date as though made on and as of the Closing,
except to the 

                                       49

 
extent that such representations and warranties are expressly related to a
specific earlier date (in which case such representations and warranties that
are qualified by a Material Adverse Effect shall be true and correct, and those
that are not so qualified shall be true and correct except for failures to be
true and correct as would not, individually or in the aggregate have a Material
Adverse Effect with respect to ANS or, after the Closing, a Material Adverse
Effect with respect to WorldCom or ANS, on and as of such earlier date). None of
the representations or warranties regarding CompuServe or any of the CompuServe
Entities contained in Article III, disregarding any qualifications regarding
materiality, Material, Material Adverse Change or Material Adverse Effect, shall
be untrue or incorrect, except for such untrue or incorrect representations or
warranties that, when taken as a whole, do not constitute a Material Adverse
Effect.

     (b) Each of the covenants and agreements of AOL and ANS to be
performed or observed at or prior to the Closing Date pursuant to the terms
hereof shall have been duly performed or observed except where such failure
would not have a Material Adverse Effect with respect to ANS or would not
materially impair the ability of WorldCom to consummate the Purchase and Sale
and the other transactions contemplated hereby.

     (c) No Governmental Entity shall have enacted, issued, promulgated,
enforced or entered any statute, rule, regulation, injunction or other order
whether temporary, preliminary or permanent which is in effect or which has or
would have the effect of making the transactions contemplated by this Agreement
illegal or restraining or prohibiting consummation of such transaction or
imposing material restrictions on the conduct of WorldCom's or any WorldCom
Entity's business following the consummation of such transactions.

     (d) WorldCom shall have been furnished with certificates, executed by
duly authorized officers of AOL dated the Closing Date, certifying as to the
fulfillment of the conditions set forth in the immediately preceding clauses (a)
and (b).

     (e) WorldCom shall have received opinions in form and substance
reasonably acceptable to WorldCom from Mintz, Levin, Cohn, Ferris, Glovsky and
Popeo, P.C. as to the due organization, valid existence and good standing and
corporate authority of AOL; as to the due organization, valid existence and good
standing and corporate authority of ANS; and the due authorization of the
execution and delivery of this Agreement and the enforceability of this
Agreement against such of the aforesaid entities in accordance with its terms as
of the Closing Date.

     (f) AOL shall have executed and delivered to WorldCom and ANS the
Assignment and Assumption Agreement, the Agreement to Form Business Entity, the
Noncompetition and Nonsolicitation Agreement, the Transition Services Agreement
and the Network Services Agreements and shall have delivered to WorldCom the Key
Employee Agreements as required by Section 5.17.

     (g) Neither ANS nor any ANS Entity shall have suffered a Material Adverse
Change from the date of the Balance Sheet to the Closing Date.

                                       50

 
     7.3 Conditions to Obligations of AOL and ANS. The respective obligations of
AOL and ANS to consummate the Purchase and Sale and the other transactions
contemplated hereby shall be subject to the satisfaction, at or prior to the
Closing Date of the following conditions (any of which may be waived by AOL
prior to the Closing Date):

     (a) The representations and warranties of WorldCom set forth in this
Agreement that are qualified by Material Adverse Effect or otherwise as to
materiality shall be true and correct, and those that are not so qualified shall
be true and correct except for failures to be true and correct as would not have
a Material Adverse Effect with respect to WorldCom, as of the date of this
Agreement and as of the Closing Date as though made on and as of the Closing
Date, except to the extent that such representations and warranties are
expressly restricted to a specific earlier date (in which case such
representations and warranties that are qualified by a Material Adverse Effect
shall be true and correct, and those that are not so qualified shall be true and
correct except for failures to be true and correct as would not, individually or
in the aggregate have a Material Adverse Effect with respect to WorldCom on and
as of such earlier date).  None of the representations or warranties regarding
WorldCom or any of the WorldCom Entities contained in Article IV, disregarding
any qualifications regarding materiality, Material, Material Adverse Change or
Material Adverse Effect, shall be untrue or incorrect, except for such untrue or
incorrect representations or warranties that, when taken as a whole, do not
constitute a Material Adverse Effect.  Notwithstanding the foregoing, if there
should occur a Material Adverse Change with respect to the CompuServe Online
Services Business, that shall not limit or affect the obligations of AOL to
proceed with the transactions described herein, but the adjustment provision of
Section 1.11 shall be applicable.

     (b) WorldCom shall have paid the Cash Consideration, adjusted as provided
in Section 1.3(b)(i), shall have executed and delivered to AOL the Assignment
and Assumption Agreement, shall have executed and delivered to AOL or its
designee or designees the Bill of Sale and other appropriate documents of
transfer relating to the CompuServe Assets, providing for the transfer to AOL or
such designee or designees of all of the CompuServe Assets, subject to the
CompuServe Liabilities, free and clear of any Liens or Other Encumbrances which
would have a Material Adverse Effect on the CompuServe Online Services Business;
provided, that if there shall have occurred a Material Adverse Change with
respect to the CompuServe Online Services Business, that shall not limit or
affect the obligations of AOL to proceed with the transactions described herein,
but the adjustment provision of Section 1.11 shall be applicable.

     (c) Each of the covenants and agreements of WorldCom to be performed or
observed at or prior to the Closing Date pursuant to the terms hereof shall have
been duly performed or observed except where such failure would not have a
Material Adverse Effect with respect to ANS or would not materially impair the
ability of AOL or ANS to consummate the Purchase and Sale and the other
transactions contemplated hereby.

     (d) No Governmental Entity shall have enacted, issued, promulgated,
enforced or entered any statute, rule, regulation, or injunction (other than a
temporary restraining order) which would have the effect of making the
transactions contemplated by this Agreement illegal or prohibiting consummation
of such transaction.

                                       51

 
     (e) Each of AOL and ANS shall have been furnished with a certificate,
executed by duly authorized officers of WorldCom, dated the Closing Date,
certifying as to the fulfillment of the conditions set forth in clauses (a) and
(c) above.

     (f) WorldCom shall have made arrangements for the release of the
obligations of AOL in respect of the lease obligations of ANS or ANS Entities
which are described on Schedule 7.3(f), or for indemnification of AOL by
WorldCom of any liability which may be incurred by AOL subsequent to the Closing
in respect of any such guarantee.

     (g) Each of AOL and ANS shall have received opinions in form and
substance reasonably satisfactory to them from Bryan Cave LLP as to the due
incorporation, valid existence and corporate authority of WorldCom, the due
authorization of the execution and delivery of this Agreement by WorldCom, and
the enforceability of this Agreement against WorldCom in accordance with its
terms as of the Closing Date.

     (h) WorldCom, ANS and/or any of the other WorldCom Entities shall have
executed and delivered to AOL the Agreement to Form Business Entity, the
Transition Services Agreement and the Network Services Agreements.

     (i) If there shall be any Delayed Assets, WorldCom shall confirm to AOL at
the Closing its obligations in respect of such Delayed Assets as provided in
Section 1.4.

     (j) The Merger shall have been consummated as provided in the CompuServe
Agreement, and there shall have been no amendments to the CompuServe Agreement
or waivers of any obligations of Block or any other parties thereunder, which
amendment or waiver would materially and adversely affect the interests of AOL
in respect of the CompuServe Assets, the CompuServe Online Services Business or
the transactions contemplated under this Agreement.

                                  ARTICLE VIII

                       TERMINATION, AMENDMENT AND WAIVER

     8.1 Termination. This Agreement may be terminated at any time prior to the
Closing:

     (a)  By mutual written consent of WorldCom and AOL;

     (b)  By either of WorldCom or AOL:

          (i) If the Closing shall not have occurred on or before March 1, 1998,
     unless the failure to do so is the result of a breach of this Agreement by
     the party seeking to terminate this Agreement (which party shall be deemed
     to include AOL and ANS, if AOL is seeking to terminate this Agreement or

          (ii)  If the CompuServe Agreement is terminated;

                                       52

 
     (c) By WorldCom or AOL in the event the non-terminating party breaches
Section 5.10;

     (d) By WorldCom, in the event of a breach by AOL or ANS of any
representation, warranty, covenant or other agreement contained in this
Agreement which (i) would result in the failure of a condition set forth Section
7.2(a) or (b) and (ii) cannot be or has not been cured by March 1, 1998 (an "AOL
Material Breach"), provided that there is not then a WorldCom Material Breach
(as hereinafter defined); or

     (e) By AOL, in the event of a breach by WorldCom of any representation,
warranty, covenant or other agreement contained in this Agreement which (i)
would result in the failure of a condition set forth in Section 7.3(a) or (c)
and (ii) cannot be or has not been cured by March 1, 1998 (a "WorldCom Material
Breach"), provided that there is not then an AOL Material Breach.

     8.2 Effect of Termination. In the event of termination of this Agreement as
provided in Section 8.1, this Agreement shall forthwith become void and be of no
further legal effect, without any liability or obligation on the part of any
party, other than the provisions of this Section 8.2 and Sections 5.2, 5.5,
5.24, 8.3, 8.4, 8.5, 9.2, 9.3, 9.4, 9.5, 9.8, 9.9, 9.10, 9.11 and 9.12 and
except that nothing herein shall relieve any party from liability for any
willful and material breach by a party of any of its representations,
warranties, covenants or agreements set forth in this Agreement.

     8.3 Amendment. This Agreement may not be amended except by an instrument in
writing signed on behalf of AOL, ANS and WorldCom by their respective duly
authorized officers.

     8.4 Waiver. The parties hereto may waive any provision of this Agreement by
a writing signed by the party against whom the waiver is to be effective by a
duly authorized officer. No failure or delay by any party in exercising any
right, power or privilege hereunder shall operate as a waiver thereof nor shall
any single or partial exercise thereof preclude any other or further exercise
thereof or the exercise of any other right, power or privilege. The rights
herein provided shall be cumulative.

     8.5  Expenses.

     (a) At the Closing, AOL shall pay (except as otherwise provided herein) all
costs and expenses incurred by it and by ANS and any AOL Entity (including the
fees, commissions and expenses of all investment bankers, financial advisors,
legal advisors, consultants and accountants) in connection with this Agreement
and the transactions contemplated hereby and in connection with any and all
discussions, negotiations and other activities concerning any previously
contemplated possible merger, acquisition or other similar transaction with
CompuServe or any party affiliated with CompuServe. Notwithstanding the
foregoing, if this Agreement is terminated (i) by WorldCom pursuant to Section
8.1(c) or Section 8.1(d) (if as a result of a willful breach by AOL or ANS), or
(ii) by AOL pursuant to Section 8.1(c) or Section 8.1(e) (if as a result of a
willful breach by WorldCom), then in the case of clause (i) AOL shall 

                                       53

 
be obligated to pay, and shall forthwith pay, to WorldCom the amount of
$15,000,000 or in the case of clause (ii), WorldCom shall be obligated to pay,
and shall forthwith pay, to AOL the aggregate amount of $15,000,000.

     (b) AOL, ANS and WorldCom acknowledge that the provisions for the
allocation of expenses in Section 8.5 are integral parts of the transactions
contemplated by this Agreement and that, without these provisions, they would
not have entered into this Agreement.  Accordingly, if an expense reimbursement
or fee shall become due and payable by either party, and such party shall fail
to pay such expense or fee when due pursuant to Section 8.5, and, in order to
obtain such payment, suit is commenced which results in a judgment against such
party therefor, such party shall pay the other party's reasonable costs, fees
and expenses (including reasonable attorneys' fees) in connection with such
suit, together with interest computed on any such amounts determined to be due
pursuant to Section 8.5 (computed from the date upon which such amounts were due
and payable pursuant to Section 8.5 on the basis of the number of days elapsed)
and such costs (computed from the date incurred) at the prime or base rate of
interest announced from time to time by NationsBank of Texas, N.A. for its most
favored borrowers.

     (c) If Block, Block Group or CompuServe pays to WorldCom the fee set forth
in Section 11.5(a) of the CompuServe Agreement, WorldCom shall pay 50 percent of
such amount to AOL within five (5) days of receipt thereof, as a further
reimbursement of expenses incurred by AOL in connection with the transactions
described hereunder.

                                   ARTICLE IX
                                        
                                 MISCELLANEOUS

     9.1 Representations and Warranties; Survival. The representations and
warranties of any party other than ANS in this Agreement or in any instrument
delivered pursuant to this Agreement shall survive the Closing and shall remain
in effect for the applicable periods of indemnity provided in Section 5.2; ANS's
representations and warranties, however, in this Agreement or in any instrument
delivered pursuant to this Agreement, shall expire upon the Closing.

     9.2 Notices. Any notices or other communications required or desired to be
given hereunder shall be deemed to have been properly given if sent by hand
delivery, facsimile and overnight courier, registered or certified mail, return
receipt requested, postage prepaid, to the parties hereto at the following
addresses, or at such other address as such party may advise the others in
writing from time to time by like notice:

                                       54

 
          If to WorldCom:

               Charles T. Cannada
               Senior Vice President--Corporate Development
               WorldCom, Inc.
               515 East Amite Street
               Jackson, Mississippi 32901-2707
               Facsimile: (601) 360-8615

          with copies to:

               Bryan Cave LLP
               One Metropolitan Square, Suite 3600
               St. Louis, Missouri  63102-2750
               Attention:  R. Randall Wang
               Facsimile:  (314) 259-2020

          If to AOL or (prior to the Closing) ANS:

               America Online, Inc.
               Miles Gilburne
               Senior Vice President, Corporate Development
               America Online, Inc.
               22000 AOL Way
               Dulles, VA 20166
               Telecopier: (703) 265-3995

          with a copy to:

               George Vradenburg III
               Senior Vice President & General Counsel
               America Online, Inc.
               22000 AOL Way
               Dulles, VA 20166
               Facsimile: (703) 265-3995

All such notices or other communications shall be deemed to have been duly given
on the date of hand delivery or telecopy or facsimile, if receipt is confirmed,
or on the next Business Day following timely deposit of such communications with
overnight courier or on the third Business Day following the date of mailing, if
delivered by registered or certified mail.

     9.3 Governing Law and Dispute Resolution. This Agreement shall be
interpreted, construed and enforced in accordance with the law of the State of
Delaware, applied without giving effect to any conflicts-of-law principles,
except to the extent that Georgia law is applicable to the internal affairs of
WorldCom. Any dispute relating to this Agreement or the 

                                       55

 
transactions contemplated hereby shall be resolved in the state courts of
general jurisdiction, or the Chancery Court if it has subject matter
jurisdiction, of the State of Delaware or in the United States District Court
for the District of Delaware. Each party irrevocably submits to such courts'
exclusive jurisdiction and acknowledges that such courts are a convenient forum
and consents to service of process at the address for such party set forth in
Section 9.2.

     9.4 Specific Performance. Each party acknowledges and agrees that, in the
event of an actual or threatened breach of any of the provisions of this
Agreement by such party, the harm to the others will be immediate, substantial
and irreparable and that monetary damages will be inadequate. Accordingly, each
party agrees that, in such an event, the others will be entitled to equitable
relief, including an injunction and an order of specific performance, in
addition to any and all other remedies at law or in equity.

     9.5 Severability. The provisions of this Agreement shall be deemed
severable and the invalidity or unenforceability of any provision shall not
affect the validity or enforceability of the other provisions hereof. If any
provision of this Agreement or the application thereof to any Person or any
circumstance, is invalid or unenforceable, (a) a suitable and equitable
provision shall be substituted therefor in order to carry out, so far as may be
valid and enforceable, the intent and purpose of such invalid or unenforceable
provision and (b) the remainder of this Agreement and the application of such
provision to other persons, entities or circumstances shall not be affected by
such invalidity or unenforceability, nor shall such invalidity or
unenforceability affect the validity or enforceability of such provision, or the
application thereof, in any other jurisdiction.

     9.6 Financial Information. Following the Closing, WorldCom will cooperate
with AOL in furnishing financial information to AOL relating to the CompuServe
Online Services Business for periods prior to the Closing (to the extent
WorldCom acquires or has access to such information through its acquisition of
CompuServe in the Merger), and shall, if so directed by AOL, request such
information from CompuServe and from Block, and enforce its rights to require
delivery of information under the CompuServe Agreement, to the extent such
information may be required by AOL to prepare financial information required to
be filed with the Securities and Exchange Commission.

     9.7 Captions. The captions or headings in this Agreement are made for
convenience and general reference only and shall not be construed to describe,
define or limit the scope or intent of the provisions of this Agreement.

     9.8 Entire Agreement. This Agreement, including all exhibits and schedules
attached hereto, contains the entire agreement of the parties and supersedes any
and all prior or contemporaneous agreements between the parties except the
Confidentiality Agreements, written or oral, with respect to the subject matter
hereof and thereof.

     9.9 Counterparts. This Agreement may be executed in several counterparts,
each of which, when so executed, shall be deemed to be an original, and such
counterparts shall, together, constitute and be one and the same instrument.

                                       56

 
     9.10 Binding Effect; Assignability. This Agreement shall be binding on, and
shall inure to the benefit of, the parties hereto, and their respective
successors and assigns, including, in the case of AOL, any affiliated entity to
which it may assign or transfer any portion of the CompuServe Assets, and
nothing in this Agreement, express or implied (other than the provisions of
Section 5.2, which provisions are intended to benefit the Indemnified Parties
and may be enforced by such beneficiaries), is intended to or shall confer upon
any Person any right, benefit or remedy of nature whatsoever under or by virtue
of this Agreement. No party may assign or delegate any right or obligation
hereunder without the prior written consent of the other parties. Any assignment
of rights or delegation of obligations not in compliance herewith shall be null
and void.

     9.11 No Rule of Construction. The parties acknowledge that this Agreement
was initially prepared by WorldCom, and that all parties have read and
negotiated the language used in this Agreement. The parties agree that, because
all parties participated in negotiating and drafting this Agreement, no rule of
construction shall apply to this Agreement which construes ambiguous language in
favor of or against any party by reason of that party's role in drafting this
Agreement.

     9.12 Schedules. The Schedules in this Agreement shall be arranged in
separate parts corresponding to the numbered and lettered sections, and the
disclosure in any numbered or lettered part shall be deemed to relate to and to
qualify only the particular representation or warranty set forth in the
corresponding numbered or lettered section, and not any other representation or
warranty (unless an express and specific reference to any other Schedule which
clearly identifies the particular item being referred is set forth therein).

                                   ARTICLE X
                                        
                                  DEFINITIONS
                                        
     When used in this Agreement, the following terms shall have the meanings
indicated below:

     "Adjustment Factor" has the meaning set forth in Section 1.9(a).

     "Affiliate" means, with respect to any Person, at the time in question, any
other Person controlling, controlled by or under common control with such
Person.  For purposes of this definition, "control" (including the terms
"controlling," "controlled by" and "under common control with") means the
possession, directly or indirectly, of the power to direct or cause the
direction of the management and policies of a Person, whether through the
ownership of voting securities or otherwise.

     "Agreed Allocation" has the meaning set forth in Section 6.1(b)(ii).

     "Agreement" has the meaning set forth in the first paragraph of this
Purchase and Sale Agreement.

                                       57

 
     "Agreement to Form Business Entity" has the meaning set forth in Section
5.15.

     "ANS" has the meaning set forth in the first paragraph of this Agreement.

     "ANS Benefit Plans" has the meaning set forth in Section 3.11(a).

     "ANS Closing Date Balance Sheet" has the meaning set forth in Section 1.6.

     "ANS Competitive Proposal" has the meaning set forth in Section 5.10(a).

     "ANS Employees" has the meaning set forth in Section 5.13(a).

     "ANS Entity" or "ANS Entities" means any corporation, limited liability
company, partnership, limited partnership or other organization whether
incorporated or unincorporated (i) of which at least a majority of the
securities or interests having by the terms thereof ordinary voting power to
elect at least a majority of the Board of Directors or others performing similar
functions with respect to such corporation or other organization is directly or
indirectly owned or controlled by ANS and/or by any one or more of the ANS
Entities, (ii) of which ANS or any one or more of the ANS Entities is a general
partner or managing member or (iii) which ANS or any one or more of the ANS
Entities otherwise controls.

     "ANS Excluded Assets" means the assets listed on Schedule 10.1, which are
used in or related to the ANS Network Services Business, but which are not owned
by ANS or an ANS Entity, are not required for the operation of the ANS Network
Services Business and which shall not be transferred to ANS under the provisions
of Section 2.1 (whether because they will be used by AOL or an AOL Entity in
providing services to ANS hereunder or otherwise).  Such term shall also include
the assets referred to in clauses (x) and (y) of Section 2.1

     "ANS Financial Statements" has meaning set forth in Section 3.5

     "ANS Net Asset Consideration" has the meaning set forth in Section 1.6(a).

     "ANS Network Assets" shall mean all Assets which are principally used in or
necessary for the ANS Network Services Business, including, without limitation,
the Assets listed on Schedule 10.2, but excluding the ANS Excluded Assets.

     "ANS Network Services Business" means the direct or indirect provision by
ANS and the ANS Entities, through resale or otherwise, of public Internet
connectivity services and wide area data network and virtual private data
network services, and related products and services, including, without
limitation, Internet access, security products and services, web hosting and
electronic commerce.

     "ANS Rights" has the meaning set forth in Section 3.13(a).

     "ANS Shares" has the meaning set forth in the Recitals hereto.

     "AOL" has the meaning set forth in the first paragraph of this Agreement.

     "AOL Entity" or "AOL Entities" means any corporation, limited liability
company, partnership, limited partnership or other organization whether
incorporated or unincorporated (i) of which at least a majority of the
securities or interests having by the terms thereof ordinary voting power to
elect at least a majority of the Board of Directors or others performing similar
functions with respect to such corporation or other organization is directly or
indirectly owned or 

                                       58

 
controlled by AOL and/or by any one or more of the AOL Entities, (ii) of which
AOL or any one or more of the AOL Entities is a general partner or managing
member or (iii) which AOL or any one or more of the AOL Entities otherwise
controls.

     "AOL Indemnified Parties" has the meaning set forth in Section 5.2(a).

     "AOL Material Breach" has the meaning set forth in Section 8.1(d).

     "AOL Unvested Stock Options" has the meaning set forth in Section 1.9(a).

     "Assets" means any and all assets and properties, tangible or intangible,
including, without limitation, the following: (i) certificates of deposit,
bankers' acceptances, stock, debentures, evidences of indebtedness, certificates
of interest or participation in profit-sharing agreements, collateral-trust
certificates, preorganization certificates, investment contracts, voting-trust
certificates; (ii) software, trade secrets, confidential information, registered
and unregistered patents and trademarks, service marks, service names, trade
styles and trade names and associated goodwill; statutory, common law and
registered copyrights; applications for any of the foregoing, rights to use any
of the foregoing and other rights in, to and under any of the foregoing; (iii)
rights under Contracts and permits; (iv) real estate and buildings and other
improvements thereon and timber and mineral rights of every kind; (v) leasehold
improvements, fixtures, trade fixtures, machinery, hardware, equipment
(including modems, transmission facilities and transportation and office
equipment), tools, dies and furniture; (vi) office supplies, production
supplies, spare parts, other miscellaneous supplies and other tangible property
of any kind; (vii) raw materials, work-in-process, finished goods, consigned
goods and other inventories; (viii) prepayments or prepaid expenses; (ix)
claims, causes of action, choses in action, rights of recovery and rights of
set-off of any kind; (x) the right to receive mail and other communications;
(xi) lists of advertisers, records pertaining to advertisers and accounts, lists
and records pertaining to customers, suppliers and agents, and books, ledgers,
files and business records of every kind; (xii) advertising materials and other
recorded, printed or written materials; (xiii) goodwill as a going concern and
other intangible properties; (xiv) personnel records and employee contracts,
including any rights thereunder to restrict an employee from competing in
certain respects; and (xv) licenses and authorizations issued by any
Governmental Entity.

     "Assignment and Assumption Agreement" has the meaning set forth in Section
1.3(b)(iii).

     "Arbiter" has the meaning set forth in Section 1.5(b).

     "Average Trading Price" means, in respect of any shares,  the average of
the daily closing prices of the shares of the same class, in its principal
trading market as reported in The Wall Street Journal, Eastern Edition, or if
                              -----------------------                        
not reported thereby, The New York Times, for the twenty consecutive full
                      ------------------                                 
trading days ending on the second full trading day immediately preceding the
Closing Date.

     "Balance Sheet" has the meaning set forth in Section 3.5.

     "Bill of Sale" has the meaning set forth in Section 1.3(b)(ii).

     "Block" means H&R Block, Inc., a Missouri corporation.

     "Block Group" means  H&R Block Group, Inc., a wholly-owned subsidiary of
Block.

                                       59

 
     "Budget" has the meaning set forth in Section 5.1(b).

     "Business Day" means a day other than a Saturday, Sunday or a day on which
the banks in New York City are authorized or obligated by law or executive order
to close.

     "Buyer's Allocation" has the meaning set forth in Section 6.1(b)(ii).

     "Buyer Group Member" has the meaning set forth in Section 6.3(d).

     "Calculating Party" has the meaning set forth in Section 6.1(c).

     "Cash Consideration" has the meaning set forth in Section 1.3(b)(i).

     "Closing" has the meaning set forth in Section 1.2.

     "Closing Date" has the meaning set forth in Section 1.2.

     "COLS Closing Date Balance Sheet" has the meaning set forth in Section
1.5(a).

     "Code" means the Internal Revenue Code of 1986, as amended (including any
successor statute), and the rules and regulations promulgated thereunder.

     "Confidentiality Agreement" has the meaning set forth in Section 5.5.

     "Contract" means any written or oral contract, agreement, license, lease,
indenture or evidence of indebtedness.

     "CompuServe" has the meaning set forth in the recitals hereto.

     "CompuServe Agreement" has the meaning set forth in the recitals hereto.

     "CompuServe Assets" means all of the Assets principally used in or
necessary for the conduct of the CompuServe Online Services Business, or which
will be required by AOL in its operation of the CompuServe Online Services
Business, excluding the CompuServe Excluded Assets.  In event of uncertainty as
to whether any particular Asset constitutes part of the CompuServe Assets,
determinations shall be made in a manner consistent with the allocations
reflected in the Pro Forma Balance Sheet.

     "CompuServe Entity" or "CompuServe Entities" means any corporation, limited
liability company, partnership, limited partnership or other organization
whether incorporated or unincorporated (i) of which at least a majority of the
securities or interests having by the terms thereof ordinary voting power to
elect at least a majority of the Board of Directors or others performing similar
functions with respect to such corporation or other organization is directly or
indirectly owned or controlled by CompuServe and/or by any one or more of the
CompuServe Entities, (ii) of which CompuServe or any one or more of the
CompuServe Entities is the general partner or managing member or (iii) which
CompuServe or any one or more of the CompuServe Entities otherwise controls.

     "CompuServe Excluded Assets" means assets related to the CompuServe Online
Services Business which are, pursuant to the terms of this Agreement, not to be
transferred to AOL or its designee(s) hereunder, including, without limitation,
the Assets listed on Schedule 10.5.

                                       60

 
     "CompuServe Liabilities" means all of the Liabilities arising out of,
relating to or resulting from the ownership, use or possession of the CompuServe
Assets or the operation of the CompuServe Online Services Business, whether
arising prior to or after the Closing Date, including, without limitation, (a)
those set forth on Schedule 10.4(a), (b) obligations to employees of the
CompuServe Online Services Business, including severance and other benefits on
terms no less favorable than the existing CompuServe severance and benefit plans
(subject to the provisions of Section 1.7) and (c) legal and administrative
proceedings relating to the CompuServe Online Services Business, but excluding
Excluded Liabilities.

     "CompuServe Net Asset Consideration" has the meaning set forth in Section
1.5(a).

     "CompuServe-Ohio" has the meaning set forth in the recitals hereto.

     "CompuServe Online Services Business" means the U.S., European and other
international online services businesses of CompuServe, as well as Sprynet.

     "Deemed Purchase Price" has the meaning set forth in Section 6.1(b)(ii).

     "Delayed Asset" has the meaning set forth in Section 1.4(a).

     "Delayed Liability" has the meaning set forth in Section 1.4(a).

     "Disputing Party" has the meaning set forth in Section 6.1(c).

     "Elections" has the meaning set forth in Section 6.1(a).

     "Effective Time" has the meaning set forth in Section 1.2.

     "Employment and Withholding Taxes" means all employment, payroll and
withholding Taxes payable with respect to salaries, wages, commissions, other
compensation or other payments actually or constructively made by ANS or any AOL
Entity on or before the Closing Date, except to the extent such Taxes have been
withheld on or prior to the Closing Date and are required to be paid to the
appropriate taxing authority after the Closing Date.

     "Environmental Laws" means any federal, state or local, domestic or foreign
statute, regulation, rule or ordinance, and any judicial or administrative
interpretation thereof, regulating the use, generation, handling, storage,
transportation, discharge, emission, spillage or other release of Hazardous
Substances or relating to the protection of the environment.

     "ERISA" means the Employee Retirement Income Security Act of 1974, as
amended.

     "Exchange Act" means the Securities and Exchange Act of 1934, as amended,
and the rules and regulations promulgated thereunder.

     "Excluded Liabilities" shall mean all Liabilities arising out of, relating
to or resulting from the ownership, use or possession of the CompuServe Assets
or the operation of the CompuServe Online Business prior to the Closing Date,
including but not limited to those Liabilities described on Schedule 10.6.

     "Excluded Transactions" has the meaning set forth in Section 6.2(a)(i).

     "Financial Statements" has the meaning set forth in Section 3.5.

                                       61

 
     "GAAP" means United States generally accepted accounting principles and its
foreign equivalents.

     "Governmental Authorization" means any (a) permit, license, certificate,
franchise, permission, clearance, registration, qualification or authorization
issued, granted, given or otherwise made available by or under the authority of
any Governmental Entity or pursuant to any legal requirement; or (b) right under
any Contract with any Governmental Entity.

     "Government Contracts" has the meaning set forth in Section 3.8(e).

     "Governmental Entity" means any federal, state or local government or any
court, administrative or regulatory agency or commission or other government
authority or agency, domestic or foreign.

     "Hazardous Substances" means any hazardous substances as defined by 42
U.S.C. (S)9601(14), any pollutant or contaminant as defined by 42 U.S.C.
(S)9601(33) or any toxic substance, oil or hazardous materials or other
chemicals or substances regulated by any Environmental Laws which the applicable
party or any predecessor in interest has generated, transported or disposed of
has been found at any property owned or operated by such party.

     "HSR Act" means the Hart-Scott Rodino Antitrust Improvements Act of 1976,
as amended, and regulations promulgated thereunder.

     "Including" means, when following any general statement, term or matter,
"including but not limited to," "including, without limitation" or words of
similar import and shall not be construed to limit such statement, term or
matter to the specific terms or matters as provided immediately following the
word "including" or to similar items or matters, whether or not non-limiting
language is used with reference to the word "including" or similar items or
matters, but rather shall be deemed to refer to all other items or matters that
could reasonably fall within the broadest possible scope of the general
statement, term or matter.

     "Indemnified Party" or "Indemnified Parties" has the meaning set forth in
Section 5.2(c).

     "Indemnifying Party" has the meaning set forth in Section 5.2(c).

     "Indemnitee" has the meaning set forth in Section 5.2(d)(iii).

     "Indemnitor" has the meaning set forth in Section 5.2(d)(iii).

     "International Distribution Agreements" has the meaning set forth in
Section 3.8(c).

     "IRS" means the Internal Revenue Service of the United States of America.

     "Key Employee Agreements" has the meaning set forth in Section 5.17.

     "knowledge" means, with respect to AOL (or an AOL Entity) or WorldCom (or a
WorldCom Entity), the actual knowledge of, or knowledge which could reasonably
be obtained through reasonably diligent investigation or inquiry by, any
director or executive officer of AOL or WorldCom, as the case may be, and, in
the case of ANS or AOL, shall also include the actual knowledge of, or knowledge
which could reasonably be obtained through reasonably diligent investigation or
inquiry by, ANS's Chief Executive Officer or Chief Financial Officer.

                                       62

 
     "Liabilities" means all claims, debts, liabilities, royalties, license
fees, losses, costs, expenses, deficiencies, litigation proceedings, taxes,
levies, imposts, duties, deficiencies, assessments, attorneys' fees, charges,
allegations, demands, damages, judgments or obligations, whether absolute or
contingent, matured or unmatured, liquidated or unliquidated, accrued or
unaccrued, known or unknown and whether or not the same would properly be
reflected on a balance sheet, including all costs and expenses relating thereto.

     "Liens or Other Encumbrances" means any lien, pledge, mortgage, security
interest, claim, lease, charge, option, right of first refusal, easement,
servitude, transfer restriction under any shareholder or other agreement or
encumbrance or any other rights of third parties.

     "Losses and Expenses" means any and all damages, liabilities, obligations,
losses, deficiencies, demands, claims, penalties, assessments, judgments, fees,
actions, proceedings and suits of whatever kind and nature, and regardless of
whether or not related to a Third-Party Claim, a direct claim or otherwise, and
all costs and expenses related thereto (including reasonable attorney's fees and
disbursements).

     "Material" means, (a) when used in connection with AOL, ANS or any ANS
Entity, material with respect to the business, operations, properties, assets,
liabilities, condition (financial or otherwise) or prospects of ANS and the ANS
Network Services Business, taken as a whole, (b) when used in connection with
WorldCom, material with respect to the business, operations, properties, assets,
liabilities, condition (financial or otherwise) or prospects of WorldCom and the
other WorldCom Entities, taken as a whole, and (c) when used in connection with
CompuServe or any of the CompuServe Entities, material with respect to the
business, operations, properties, assets, liabilities, condition (financial or
otherwise) or prospects of the CompuServe Online Services Business, taken as a
whole.

     "Material Adverse Change" means (a) when used in connection with any party
hereto other than AOL, ANS or any AOL Entity, any change which is materially
adverse to the business, operations, properties, assets, liabilities, condition
(financial or otherwise) or prospects, of such party, and its related Entities,
taken as a whole, (b) when used in connection with AOL, ANS or any AOL Entity,
means any change which is, materially adverse to the business, operations,
properties, assets, liabilities or condition (financial or otherwise) of ANS and
the ANS Network Services Business, taken as a whole, and (c) when used in
connection with CompuServe or any of the CompuServe Entities, any change which
is material with respect to the business, operations, properties, assets,
liabilities, condition (financial or otherwise) or prospects of the CompuServe
Online Services Business, taken as a whole.  Any determination whether there has
occurred a Material Adverse Change in respect of the CompuServe Online Services
Business shall be made in the context of the declining trends which have
occurred in such business prior to the date hereof, and which WorldCom and AOL
have taken into account in entering into this Agreement and the transactions
contemplated hereby.  Without limiting the foregoing, for purposes of Section
1.11, a Material Adverse Change with respect to the CompuServe Online Services
Business shall also mean that (a) there shall have occurred a net loss in the
number of Total CSI plus Spry customers (as defined in  the CompuServe Monthly
Key Metrics Report) during the period between the date hereof and the Closing
Date (the "Pre-Closing Period") which exceeds an average of 2,600 per day or (b)
a decrease in the Revenue Per Customer per month (as defined in the CompuServe
quarterly earnings announcement or 

                                       63

 
quarterly report to shareholders) for the entire CompuServe Online Services
Business for the Pre-Closing Period exceeding $2.00 or (c) a failure in the
CompuServe Online Services Business host system resulting in a general inability
to provide online services for a period of at least 24 consecutive hours.

     "Material Adverse Effect" means (a) when used in connection with any party
hereto other than AOL, ANS or any AOL Entity, any effect that has a material
adverse impact on the business, operations, properties, assets, liabilities,
condition (financial or otherwise) or prospects of such party, and its related
Entities, taken as a whole, and (b) when used in connection with AOL, ANS or any
AOL Entity, any effect that has a material adverse impact on the business,
operations, properties, assets, liabilities or financial condition (financial or
otherwise) of ANS and the ANS Network Services Business, taken as a whole and
(c) when used in connection with CompuServe or any of the CompuServe Entities,
any effect that has a material adverse impact on the business, operations,
properties, assets, liabilities, condition (financial or otherwise) or prospects
of the CompuServe Online Services Business, taken as a whole.

     "Merger" has the meaning set forth in the recitals hereto.

     "Modified Aggregate Deemed Sales Price" has the meaning set forth in
Section 6.1(b)(ii).

     "NASDAQ" means the Nasdaq National Market.

     "Network Services Agreements" has the meaning set forth in Section 5.19.

     "Noncompetition and Nonsolicitation Agreement" has the meaning set forth in
Section 5.16.

     "Notice of Dispute" has the meaning set forth in Section 1.5(b).

     "Person" means and includes any natural person, corporation, limited
liability company, partnership, limited partnership, firm, joint venture,
association, joint-stock company, trust, business trust, unincorporated
organization, Governmental or other entity.

     "Pro Forma Balance Sheet" means the pro-forma balance sheet of CompuServe-
Ohio as of June 30, 1997, which appears as Schedule 10.3(b).

     "Purchase and Sale" has the meaning set forth in Section 1.1

     "Related Party" means, with respect to any party, any of such party's or
its parent's or subsidiaries' directors, officers, 50% or greater shareholders,
employees or, except with respect to such party's primary relationship with such
other person or entity, a consultant or agent.

     "Schedule 5.13 Agreements" has the meaning set forth in Section 5.13.

     "SEC" means the Securities and Exchange Commission.

     "Securities Act" means the Securities Act of 1933, as amended.

     "Section 338 Forms" has the meaning set forth in Section 6.1(b)(i).

     "Seller Group" has the meaning set forth in Section 6.3(d).

                                       64

 
     "Seller Consolidated and Combined Return" means any consolidated,
affiliated, combined or unitary income or franchise Tax Return of AOL or ANS
which includes ANS and/or any AOL Entity.

     "Selling Entities" has the meaning set forth in the first paragraph of this
Agreement.

     "Seller Group" has the meaning set forth in Section 6.3(d).

     "Sprynet" has the meaning given in Section 1.5(a).

     "Tax" and "Taxes" means all taxes, charges, fees, levies, tariffs, duties
or other similar assessments, including, (i) income, gross receipts, gains,
surtax, severance, payroll, production, ad valorem or value added, surtax,
premium, excise, real property, personal property, windfall profit, sales, use,
transfer, duty, licensing, withholding, employment, payroll, estimated and
franchise taxes imposed by the United States of America, any state, local, or
foreign government, or any subdivision, agency, or other similar Person of the
United States or any such government, and (ii) any interest, fines, penalties,
assessments, or additions to tax resulting from, attributable to or incurred in
connection with any Tax or any contest, dispute or refund thereto; whether or
not imposed on a consolidated combined or unitary basis or as a result of
transferee, joint or several liability.

     "Tax Claim" has the meaning set forth in Section 6.2(d)(i).

     "Tax Reform Act" means the Tax Reform Act of 1986.

     "Tax Return" means any report, return, statement or other information
required to be supplied to a taxing authority in connection with Taxes.

     "Tax Settlement Auditor" has the meaning set forth in Section 6.1(c).

     "Tax Settlement Procedure" has the meaning set forth in Section 6.1(c).

     "Tax Statement" has the meaning set forth in Section 6.2(e)(iii).

     "1060 Forms" means forms or reports required to be filed pursuant to
Section 1060 of the Internal Revenue Code, the Treasury Regulations promulgated
thereunder or any provisions of state, local and foreign law.

     "Third-Party Claim" has the meaning set forth in Section 5.2(d)(i).

     "WAC" has the meaning set forth in the recitals hereto.

                                       65

 
     "WorldCom" has the meaning set forth in the first paragraph of this
Agreement.

     "WorldCom (ANS) Stock Options" has the meaning given in Section 1.9(b).

     "WorldCom Competitive Proposal" has the meaning set forth in Section
5.10(d).

     "WorldCom Entity" or "WorldCom Entities" means any corporation, limited
liability company, partnership, limited partnership or other organization
whether incorporated or unincorporated (i) of which at least a majority of the
securities or interests having by the terms thereof ordinary voting power to
elect at least a majority of the Board of Directors or others performing similar
functions with respect to such corporation or other organization is directly or
indirectly owned or controlled by WorldCom and/or by any one or more of the
WorldCom Entities, (ii) of which WorldCom or any one or more of the WorldCom
Entities is the general partner or managing member or (iii) which WorldCom or
any one or more of the WorldCom Entities otherwise controls.

     "WorldCom Indemnified Parties" has the meaning set forth in Section 5.2(a).

     "WorldCom Material Breach" has the meaning set forth in Section 8.1(e).

     "WorldCom Stock Options" has the meaning given in Section 1.9(a).

     IN WITNESS WHEREOF, AOL, ANS and WorldCom have caused this Agreement to be
executed by their respective duly authorized officers, and have caused their
respective corporate seals to be hereunto affixed, all as of the day and year
first above written.


                                       AMERICA ONLINE, INC.


                                       By:
                                          ----------------------------------
                                                    Miles Gilburne
                                                Senior Vice President
                                                Corporate Development

                                       ANS COMMUNICATIONS, INC.


                                       By:
                                          ----------------------------------
                                                    Shiela A. Clark
                                                Deputy General Counsel

                                       WORLDCOM, INC.


                                       By:
                                          ----------------------------------
                                                    John W. Sidgmore
                                               Chief Operations Officer

                                       66