MCI COMMUNICATIONS CORP
8-K/A, 1997-11-14
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                      -------------------------------------

                                    FORM 8-K/A

                                 CURRENT REPORT
                     PURSUANT TO SECTION 13 OR 15(d) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                      November 12, 1997  (November 9, 1997) 
                Date of report (Date of earliest event reported)

                         MCI Communications Corporation
       -----------------------------------------------------------------
             (Exact name of registrant as specified in its charter)


        Delaware                                      52-0886267
- ----------------------------------------          -----------------
(State of incorporation or organization)           (I.R.S. Employer
                                                    Identification No.)


1801 Pennsylvania Avenue, N.W.
         Washington DC                                   20006
- -----------------------------------------          -----------------
 (Address of principal executive offices)              (Zip Code)


Registrant's telephone number, including area code: 202-872-1600



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<PAGE>



                                     PAGE 2

Item 7.  Financial Statements and Exhibits

         (c) The following exhibit is filed with this report:

         2. Agreement and Plan of Merger, dated as of November 9, 1997, among 
MCI Communications Corporation, WorldCom, Inc. and TC Investments Corp.




                                   SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Company
has duly  caused  this  report  to be signed  on its  behalf by the  undersigned
thereunto duly authorized.

MCI COMMUNICATIONS CORPORATION


By:  /S/ Edward G. Freitag
    --------------------------
     Edward G. Freitag
     Assistant Secretary


Dated:  November 14, 1997


<PAGE>


                                  EXHIBIT INDEX


Exhibit
No.                        Description

2                 Agreement and Plan of Merger, dated as of November 9,
                  1997, among MCI Communications Corporation, WorldCom,
                  Inc. and TC Investments Corp.



                                       1


        AGREEMENT AND PLAN OF MERGER, dated as of November 9, 1997 (this
"Agreement"),  among  WORLDCOM,  INC., a Georgia  corporation  ("WorldCom"),  TC
INVESTMENTS CORP., a Delaware  corporation and a direct wholly-owned  subsidiary
of WorldCom  ("Merger  Sub"),  and MCI  COMMUNICATIONS  CORPORATION,  a Delaware
corporation ("MCI").

                              W I T N E S S E T H:

     WHEREAS,  the respective  Boards of Directors of World Com,  Merger Sub and
MCI have each  determined  that the merger of MCI with and into  Merger Sub (the
"Merger") is in the best interests of their  respective  stockholders,  and such
Boards of Directors have approved such Merger, upon the terms and subject to the
conditions set forth in this Agreement,  pursuant to which (a) each  outstanding
share of common  stock,  par value  $.10 per  share,  of MCI  ("Ordinary  Common
Stock")  issued and  outstanding  immediately  prior to the  Effective  Time (as
defined in Section 1.3),  other than shares owned or held directly or indirectly
by  WorldCom  or  directly  by MCI will be  converted  into the right to receive
shares of common stock, par value $.01 per share of WorldCom  ("WorldCom  Common
Stock") as set forth in Section 1.8 and (b) each share of Class A common  stock,
par value $.10 per share, of MCI ("Class A Common Stock" and,  collectively with
the Ordinary  Common Stock,  the "MCI Common  Stock") will be converted into the
right to receive $51 in cash as set forth in Section 1.8;

     WHEREAS,   WorldCom,   Merger   Sub  and  MCI   desire   to  make   certain
representations,  warranties,  covenants and  agreements in connection  with the
transactions contemplated hereby and also to prescribe various conditions to the
transactions contemplated hereby;

     WHEREAS,  WorldCom,  Merger Sub and MCI intend,  by  approving  resolutions
authorizing this Agreement,  to adopt this Agreement as a plan of reorganization
within the meaning of Section  368(a) of the Internal  Revenue Code of 1986,  as
amended (the "Code"), and the regulations promulgated thereunder;

     WHEREAS,  MCI,  British  Telecommunications  plc, a public limited  company
incorporated   under  the  laws  of  England  and  Wales  ("BT"),  and  Tadworth
Corporation,  a Delaware  corporation and a wholly owned  subsidiary of BT, have
entered into the  Agreement  and Plan of Merger dated as of November 3, 1996, as
amended (the "BT Merger Agreement");

     WHEREAS,  BT, MCI and WorldCom  have entered into an agreement  dated as of
the date hereof pursuant to which,  among other things,  BT has consented to and
agreed to support  the Merger and the other  transactions  contemplated  by this
Agreement (the "BT Agreement").

     WHEREAS,  in the BT  Agreement,  WorldCom has agreed to pay BT $450 million
and  expenses  not in excess of $15 million  (collectively,  the "BT  Inducement
Fee") in  connection  with the plan of  reorganization  in order to induce BT to
waive its rights waive its rights under,  and agree to terminate,  the BT Merger
Agreement; andunder, and agree to terminate, the BT Merger Agreement; and

<PAGE>

                                       2



     WHEREAS,  the BT  Merger  Agreement  has been  terminated  by MCI and BT by
mutual agreement pursuant to Section 7.1(a) of the BT Merger Agreement.

                  NOW,  THEREFORE,  in  consideration  of the  foregoing and the
respective  representations,  warranties,  covenants  and  agreements  set forth
herein,  and intending to be legally bound hereby,  the parties  hereto agree as
follows:


                                    ARTICLE I

                                   THE MERGER

                  1.1 The Merger.  Upon the terms and subject to the  conditions
set  forth  in this  Agreement,  and in  accordance  with the  Delaware  General
Corporation  Law (the  "DGCL"),  MCI shall be merged with and into Merger Sub at
the Effective Time.  Following the Merger, the separate  corporate  existence of
MCI shall cease and Merger Sub shall continue as the surviving  corporation (the
"Surviving Corporation") under the name "MCI Communications Corporation".

                  1.2 Closing.  The closing of the Merger (the  "Closing")  will
take place on the fifth Business Day after the  satisfaction  or waiver (subject
to applicable law) of the conditions (excluding conditions that, by their terms,
cannot be  satisfied  until the  Closing  Date)  set  forth in  Article  VI (the
"Closing  Date"),  unless  another  time or date is agreed to in  writing by the
parties  hereto.  The Closing shall be held at the offices of Simpson  Thacher &
Bartlett,  425 Lexington Avenue, New York, New York, 10017, unless another place
is agreed to in writing by the parties hereto.

                  1.3  Effective  Time.  As soon as  practicable  following  the
Closing,  the parties  shall (i) file a  certificate  of merger  (the  "Delaware
Certificate  of  Merger")  in  such  form  as is  required  by and  executed  in
accordance  with the  relevant  provisions  of the DGCL and (ii)  make all other
filings or recordings required under the DGCL. The Merger shall become effective
at such  time as the  Delaware  Certificate  of Merger  is duly  filed  with the
Delaware Secretary of State or at such subsequent time as WorldCom and MCI shall
agree and be specified in the Delaware  Certificate of Merger (the date and time
the Merger becomes effective being the "Effective Time").



<PAGE>


                                        3



                  1.4 Effects of the Merger.  At and after the  Effective  Time,
the Merger  will have the effects set forth in the DGCL.  Without  limiting  the
generality of the foregoing,  and subject thereto, at the Effective Time all the
property, rights, privileges,  powers and franchises of MCI and Merger Sub shall
be vested in the Surviving Corporation, and all debts, liabilities and duties of
MCI and  Merger  Sub shall  become  the  debts,  liabilities  and  duties of the
Surviving Corporation.

                  1.5   Certificate  of   Incorporation.   The   certificate  of
incorporation  of Merger Sub, as in effect  immediately  prior to the  Effective
Time, shall be the certificate of  incorporation  of the Surviving  Corporation,
until  thereafter  changed or amended as provided  therein or by applicable law,
except that  Article I of the  Certificate  of  Incorporation  of the  Surviving
Corporation  shall be amended to read in its  entirety as follows:  "The name of
this Corporation is 'MCI Communications Corporation'".

                  1.6  By-Laws.  The  by-laws  of Merger Sub as in effect at the
Effective  Time  shall  be  the  by-laws  of  the  Surviving  Corporation  until
thereafter changed or amended as provided therein or by applicable law.

                  1.7 Officers  and  Directors  of  Surviving  Corporation.  The
officers of MCI as of the Effective  Time shall be the officers of the Surviving
Corporation,  until the  earlier of their  resignation  or removal or  otherwise
ceasing to be an officer or until their  respective  successors are duly elected
and  qualified,  as the case  may be.  The  directors  of  Merger  Sub as of the
Effective  Time shall be the  directors of the Surviving  Corporation  until the
earlier of their resignation or removal or otherwise ceasing to be a director or
until their respective successors are duly elected and qualified.

                  1.8  Effect on Capital  Stock.  (a) At the  Effective  Time by
virtue of the Merger and without  any action on the part of the holder  thereof,
(i) each share of Ordinary Common Stock issued and outstanding immediately prior
to the  Effective  Time (other than  shares of  Ordinary  Common  Stock owned by
WorldCom  or  Merger  Sub or held by MCI,  all of  which  shall be  canceled  as
provided in Section  1.8(c))  shall be converted  into the right to receive that
number  of shares of  WorldCom  Common  Stock  equal to the  Exchange  Ratio (as
defined below) (the "Ordinary Common Stock Merger  Consideration") and (ii) each
share of Class A Common Stock issued and  outstanding  immediately  prior to the
Effective  Time (other than shares of Class A Common  Stock owned by WorldCom or
Merger Sub or held by MCI, all of which shall be canceled as provided in Section
1.8(c))  shall be  converted  into the  right to  receive  $51 in cash,  without
interest  thereon  (the  "Class  A  Common  Stock  Merger  Consideration",  and,
collectively  with the Ordinary Common Stock Merger  Consideration,  the "Merger
Consideration").  "Exchange  Ratio" means the  quotient  (rounded to the nearest
1/10,000) determined by dividing $51.00 by the


<PAGE>


                                        4



average of the high and low sales prices of WorldCom Common Stock as reported on
The Nasdaq National Market ("NASDAQ") on each of the twenty consecutive  trading
days ending with the third trading day immediately  preceding the Effective Time
(the "Measurement Period");  provided, that the Exchange Ratio shall not be less
than 1.2439 or greater than 1.7586.

                  (b) As a result of the  Merger and  without  any action on the
part of the holders  thereof,  at the Effective  Time,  all shares of MCI Common
Stock shall cease to be outstanding  and shall be canceled and retired and shall
cease to exist, and each holder of a certificate  which immediately prior to the
Effective Time represented any such shares of MCI Common Stock (a "Certificate")
(other than Merger Sub,  WorldCom  and MCI) shall  thereafter  cease to have any
rights  with  respect to such  shares of MCI Common  Stock,  except the right to
receive the applicable  Merger  Consideration in accordance with Article II upon
the surrender of such certificate.

                  (c) Each share of MCI Common Stock issued and owned or held by
WorldCom,  Merger  Sub or MCI at the  Effective  Time  shall,  by  virtue of the
Merger,  cease to be outstanding  and shall be canceled and retired and no stock
of WorldCom or other consideration shall be delivered in exchange therefor.

                  (d) Each share of common stock,  par value $.01 per share,  of
Merger Sub issued and outstanding immediately prior to the Effective Time, shall
remain  issued,  outstanding  and  unchanged as validly  issued,  fully paid and
nonassessable shares of common stock, par value $.01 per share, of the Surviving
Corporation as of the Effective Time.


                                   ARTICLE II

                            EXCHANGE OF CERTIFICATES

                  2.1 Exchange Fund. Prior to the Effective Time, WorldCom shall
appoint The Bank of New York, or another commercial bank or trust company having
net capital of not less than  $100,000,000,  to act as exchange agent  hereunder
for the purpose of exchanging  Certificates  for the Merger  Consideration  (the
"Exchange  Agent").  At or prior to the Effective  Time,  WorldCom shall deposit
with the  Exchange  Agent,  in trust for the benefit of holders of shares of MCI
Common  Stock,  certificates  representing  the WorldCom  Common Stock  issuable
pursuant to Section 1.8 in exchange for  outstanding  shares of Ordinary  Common
Stock and cash in the amount  required to be exchanged  for Class A Common Stock
in the Merger pursuant to Section 1.8.  WorldCom agrees to make available to the
Exchange Agent from time to time as needed,  cash sufficient to pay cash in lieu
of  fractional  shares  pursuant  to  Section  2.5 and any  dividends  and other
distributions pursuant to Section 2.3. Any cash and


<PAGE>


                                        5



certificates  of WorldCom  Common Stock  deposited with the Exchange Agent shall
hereinafter be referred to as the "Exchange Fund".

                  2.2 Exchange  Procedures.  As soon as  reasonably  practicable
after the Effective  Time,  the Surviving  Corporation  shall cause the Exchange
Agent to mail to each holder of a Certificate (i) a letter of transmittal  which
shall specify that delivery shall be effected, and risk of loss and title to the
Certificates  shall pass, only upon delivery of the Certificates to the Exchange
Agent,  and  which  letter  shall  be in  customary  form and  have  such  other
provisions  as  WorldCom  may  reasonably  specify  and  (ii)  instructions  for
effecting  the  surrender of such  Certificates  in exchange for the  applicable
Merger  Consideration.  Upon  surrender of a Certificate  to the Exchange  Agent
together  with such  letter of  transmittal,  duly  executed  and  completed  in
accordance  with the  instructions  thereto,  and such  other  documents  as may
reasonably be required by the Exchange Agent, the holder of such Certificate, if
it is a  Certificate  for Ordinary  Common Stock shall be entitled to receive in
exchange therefor (A) one or more shares of WorldCom Common Stock  representing,
in the  aggregate,  the whole number of shares that such holder has the right to
receive  pursuant  to Section 1.8 (after  taking into  account all shares of MCI
Common  Stock then held by such  holder) and (B) a check in the amount  equal to
the cash that such holder has the right to receive pursuant to the provisions of
this Article II,  including  cash in lieu of any  fractional  shares of WorldCom
Common  Stock  pursuant to Section  2.5, or if it is a  Certificate  for Class A
Common  Stock,  a check in the amount equal to the cash that such holder has the
right to receive pursuant to the provisions of this Article II, and in each case
the Certificate so surrendered shall forthwith be canceled.  No interest will be
paid or will accrue on any cash payable  pursuant to Section 1.8, Section 2.3 or
Section  2.5. In the event of a transfer of  ownership of MCI Common Stock which
is not registered in the transfer records of MCI, one or more shares of WorldCom
Common  Stock  evidencing,  in the  aggregate,  the  proper  number of shares of
WorldCom  Common  Stock,  a check in the  proper  amount  of cash in lieu of any
fractional  shares of  WorldCom  Common  Stock  pursuant  to Section 2.5 and any
dividends or other  distributions  to which such holder is entitled  pursuant to
Section  2.3,  may be issued  with  respect to such MCI  Common  Stock to such a
transferee if the  Certificate  representing  such shares of MCI Common Stock is
presented  to the  Exchange  Agent,  accompanied  by all  documents  required to
evidence and effect such  transfer  and to evidence  that any  applicable  stock
transfer taxes have been paid.

                  2.3  Distributions  with  Respect to  Unexchanged  Shares.  No
dividends  or other  distributions  declared  or made with  respect to shares of
WorldCom  Common Stock with a record date after the Effective Time shall be paid
to the holder of any  unsurrendered  Certificate  with  respect to the shares of
WorldCom  Common  Stock that such  holder  would be  entitled  to  receive  upon
surrender of


<PAGE>


                                        6



such  Certificate  and no cash payment in lieu of fractional  shares of WorldCom
Common Stock shall be paid to any such holder pursuant to Section 2.5 until such
holder shall surrender such  Certificate in accordance with Section 2.2. Subject
to the effect of applicable laws,  following  surrender of any such Certificate,
there shall be paid to such holder of shares of WorldCom  Common Stock  issuable
in exchange  therefor,  without  interest,  (a) promptly  after the time of such
surrender,  the  amount  of any cash  payable  in lieu of  fractional  shares of
WorldCom  Common Stock to which such holder is entitled  pursuant to Section 2.5
and the amount of dividends or other  distributions with a record date after the
Effective  Time  theretofore  paid with respect to such whole shares of WorldCom
Common Stock,  and (b) at the appropriate  payment date, the amount of dividends
or other  distributions with a record date after the Effective Time but prior to
such  surrender  and a payment date  subsequent to such  surrender  payable with
respect to such shares of WorldCom Common Stock.

                  2.4 No  Further  Ownership  Rights in MCI  Common  Stock.  All
shares of WorldCom  Common Stock issued and cash paid upon  conversion of shares
of MCI Common Stock in  accordance  with the terms of Article I and this Article
II  (including  any cash paid pursuant to Section 2.3 or 2.5) shall be deemed to
have been issued or paid in full  satisfaction  of all rights  pertaining to the
shares of MCI Common Stock.

                  2.5 No  Fractional  Shares of WorldCom  Common  Stock.  (a) No
certificates or scrip or shares of WorldCom Common Stock representing fractional
shares of WorldCom  Common Stock shall be issued upon the surrender for exchange
of Certificates  and such fractional  share interests will not entitle the owner
thereof to vote or to have any rights of a  shareholder  of WorldCom or a holder
of shares of WorldCom Common Stock.

                  (b)  Notwithstanding  any other  provision of this  Agreement,
each holder of shares of MCI Common Stock  exchanged  pursuant to the Merger who
would  otherwise have been entitled to receive a fraction of a share of WorldCom
Common  Stock  (after  taking into  account all  Certificates  delivered by such
holder) shall  receive,  in lieu thereof,  cash (without  interest) in an amount
equal to the product of (i) such  fractional  part of a share of WorldCom Common
Stock multiplied by (ii) the last sales price per share of WorldCom Common Stock
quoted on NASDAQ on the  Closing  Date.  As promptly  as  practicable  after the
determination of the amount of cash, if any, to be paid to holders of fractional
interests, the Exchange Agent shall so notify WorldCom, and WorldCom shall cause
the  Surviving  Corporation  to deposit such amount with the Exchange  Agent and
shall cause the Exchange Agent to forward payments to such holders of fractional
interests subject to and in accordance with the terms hereof.



<PAGE>


                                        7



                  2.6  Termination of Exchange Fund. Any portion of the Exchange
Fund which  remains  undistributed  to the  holders of  Certificates  for twelve
months after the Effective Time shall be delivered to the Surviving  Corporation
or otherwise on the instruction of the Surviving Corporation, and any holders of
the  Certificates  who have not theretofore  complied with this Article II shall
thereafter  look only to the Surviving  Corporation  and WorldCom for the Merger
Consideration   with  respect  to  the  shares  of  MCI  Common  Stock  formerly
represented  thereby to which such holders are entitled  pursuant to Section 1.8
and Section 2.2, any cash in lieu of fractional  shares of WorldCom Common Stock
to which such holders are entitled  pursuant to Section 2.5 and any dividends or
distributions  with  respect to shares of  WorldCom  Common  Stock to which such
holders are  entitled  pursuant to Section 2.3. Any such portion of the Exchange
Fund  remaining  unclaimed  by holders of shares of MCI Common  Stock five years
after the Effective Time (or such earlier date immediately prior to such time as
such amounts would otherwise  escheat to or become property of any  Governmental
Entity (as defined in Section  3.1(c)(iii)))  shall, to the extent  permitted by
law,  become the  property of the  Surviving  Corporation  free and clear of any
claims or interest of any Person previously entitled thereto.

                  2.7 No  Liability.  None of  WorldCom,  Merger Sub,  MCI,  the
Surviving  Corporation  or the  Exchange  Agent shall be liable to any Person in
respect of any Merger Consideration from the Exchange Fund delivered to a public
official pursuant to any applicable abandoned property, escheat or similar law.

                  2.8  Investment of the Exchange Fund. The Exchange Agent shall
invest any cash  included in the  Exchange  Fund as  directed  by the  Surviving
Corporation on a daily basis.  Any interest and other income resulting from such
investments shall promptly be paid to the Surviving Corporation.

                  2.9 Lost  Certificates.  If any  Certificate  shall  have been
lost,  stolen or destroyed,  upon the making of an affidavit of that fact by the
Person  claiming  such  Certificate  to be lost,  stolen or  destroyed  and,  if
required by the Surviving  Corporation,  the posting by such Person of a bond in
such  reasonable  amount as the  Surviving  Corporation  may direct as indemnity
against any claim that may be made against it with respect to such  Certificate,
the Exchange  Agent will deliver in exchange for such lost,  stolen or destroyed
Certificate the applicable  Merger  Consideration  with respect to the shares of
MCI Common Stock formerly  represented  thereby,  any cash in lieu of fractional
shares of WorldCom  Common  Stock,  and unpaid  dividends and  distributions  on
shares of WorldCom Common Stock deliverable in respect thereof, pursuant to this
Agreement.

                  2.10  Withholding Rights.  Each of the Surviving
Corporation and WorldCom shall be entitled to deduct and withhold
from the consideration otherwise payable pursuant to this


<PAGE>


                                        8



Agreement  to any  holder of shares of MCI Common  Stock  such  amounts as it is
required to deduct and withhold with respect to the making of such payment under
the Code and the rules and regulations promulgated thereunder,  or any provision
of state,  local or foreign tax law. To the extent that  amounts are so withheld
by the  Surviving  Corporation  or WorldCom,  as the case may be, such  withheld
amounts shall be treated for all purposes of this  Agreement as having been paid
to the  holder of the  shares  of MCI  Common  Stock in  respect  of which  such
deduction and withholding was made by the Surviving  Corporation or WorldCom, as
the case may be.

                  2.11 Further Assurances.  At and after the Effective Time, the
officers and  directors  of the  Surviving  Corporation  will be  authorized  to
execute and deliver,  in the name and on behalf of MCI or Merger Sub, any deeds,
bills of sale,  assignments or assurances and to take and do, in the name and on
behalf of MCI or Merger Sub,  any other  actions and things to vest,  perfect or
confirm of record or otherwise in the Surviving  Corporation  any and all right,
title and  interest  in, to and under any of the  rights,  properties  or assets
acquired or to be acquired by the  Surviving  Corporation  as a result of, or in
connection with, the Merger.

                  2.12 Stock Transfer Books. At the close of business,  New York
City time, on the day the Effective Time occurs, the stock transfer books of MCI
shall be closed  and there  shall be no further  registration  of  transfers  of
shares of MCI Common Stock  thereafter on the records of MCI. From and after the
Effective Time, the holders of Certificates  shall cease to have any rights with
respect to such shares of MCI Common Stock formerly represented thereby,  except
as otherwise  provided  herein or by law. On or after the  Effective  Time,  any
Certificates presented to the Exchange Agent or WorldCom for any reason shall be
converted into the Merger Consideration with respect to the shares of MCI Common
Stock formerly  represented  thereby,  any cash in lieu of fractional  shares of
WorldCom  Common  Stock to which the holders  thereof are  entitled  pursuant to
Section  2.5 and any  dividends  or other  distributions  to which  the  holders
thereof are entitled pursuant to Section 2.3.


                                   ARTICLE III

                         REPRESENTATIONS AND WARRANTIES

                  3.1 Representations and Warranties of MCI. Except as set forth
in the  MCI  Disclosure  Schedule  delivered  by MCI to  WorldCom  prior  to the
execution of this Agreement  (the "MCI  Disclosure  Schedule")  (each section of
which  qualifies the  correspondingly  numbered  representation  and warranty or
covenant  to the extent  specified  therein),  MCI  represents  and  warrants to
WorldCom as follows:


<PAGE>


                                        9



                  (a) Organization,  Standing and Power. Each of MCI and each of
its Subsidiaries is a corporation  duly organized,  validly existing and in good
standing under the laws of its  jurisdiction of  incorporation  or organization,
has all requisite  power and authority to own,  lease and operate its properties
and to carry on its business as now being conducted and is duly qualified and in
good  standing to do business  in each  jurisdiction  in which the nature of its
business or the ownership or leasing of its properties makes such  qualification
necessary other than in such jurisdictions where the failure so to qualify would
not, either individually or in the aggregate, have a Material Adverse Effect (as
defined  in  Section   8.11(c))  on  MCI.  The  copies  of  the  certificate  of
incorporation and by-laws of MCI which were previously furnished to WorldCom are
true,  complete and correct copies of such documents as in effect on the date of
this Agreement.

                  (b)  Capital  Structure.  (i)  As of  October  31,  1997,  the
authorized  capital  stock  of MCI  consisted  of (A)  2,000,000,000  shares  of
Ordinary  Common Stock,  of which  565,301,683  shares were  outstanding and (B)
500,000,000  shares of Class A Common Stock,  of which  135,998,932  shares were
outstanding and (C) 50,000,000  shares of preferred  stock, of which  10,000,000
shares of Series E Junior Participating Preferred Stock have been designated and
reserved for issuance upon exercise of the rights (the "Rights")  distributed to
the holders of MCI Common  Stock  pursuant to the Rights  Agreement  dated as of
September  30, 1994  between MCI and Mellon  Bank,  N.A.,  as rights  agent,  as
amended (the  "Rights  Agreement").  Since  October 31, 1997 to the date of this
Agreement, there have been no issuances of shares of the capital stock of MCI or
any other  securities  of MCI other than  issuances of shares (and  accompanying
Rights)  pursuant to options or rights  outstanding as of October 31, 1997 under
the  Benefit  Plans (as  defined  in  Section  8.11(i))  of MCI.  All issued and
outstanding  shares of the  capital  stock of MCI are duly  authorized,  validly
issued, fully paid and nonassessable,  and no class of capital stock (other than
Class A Common Stock) is entitled to preemptive  rights.  There were outstanding
as of October 31, 1997 no options,  warrants or other rights to acquire  capital
stock  from MCI other  than (v) the  Rights,  (w)  options  representing  in the
aggregate  the right to  purchase  75,119,367  shares of MCI Common  Stock under
MCI's 1989 Stock Option Plan,  MCI's 1988 Directors' Stock Option Plan and MCI's
1979 Stock Option Plan (collectively,  the "MCI Stock Option Plans"), (x) rights
to purchase an aggregate of 11,876,569  shares of MCI Common Stock under the MCI
1990 Stock  Purchase  Plan (the  "ESPP"),  (y)  incentive  stock units  ("ISUs")
representing  the right to receive  5,484,883  shares of MCI Common  Stock under
MCI's  1989  Stock  Option  Plan and (z)  rights to  purchase  an  aggregate  of
4,482,722  shares of MCI Common Stock under MCI's  401(k)  Plan.  Other than the
associated  Rights issued with the shares issued as described  above, no options
or warrants or other rights to acquire capital stock from MCI have


<PAGE>


                                       10



been issued or granted since October 31, 1997 to the date of this Agreement.

                  (ii) As of the date of this Agreement,  no bonds,  debentures,
notes or other  indebtedness  of MCI having the right to vote on any  matters on
which stockholders may vote ("MCI Voting Debt") are issued or outstanding.

                  (iii) Except as otherwise set forth in this Section 3.1(b) and
as contemplated  by Section 5.7, as of the date of this Agreement,  there are no
securities,   options,   warrants,  calls,  rights,   commitments,   agreements,
arrangements or undertakings of any kind to which MCI or any of its Subsidiaries
is a  party  or by  which  any of  them is  bound  obligating  MCI or any of its
Subsidiaries  to issue,  deliver or sell,  or cause to be issued,  delivered  or
sold,  additional  shares of capital stock or other voting  securities of MCI or
any of its  Subsidiaries or obligating MCI or any of its  Subsidiaries to issue,
grant,  extend or enter into any such security,  option,  warrant,  call, right,
commitment,  agreement,  arrangement  or  undertaking.  As of the  date  of this
Agreement,   there  are  no  outstanding  obligations  of  MCI  or  any  of  its
Subsidiaries  to repurchase,  redeem or otherwise  acquire any shares of capital
stock of MCI or any of its Subsidiaries.

                  (c)  Authority;  No  Conflicts.  (i)  MCI  has  all  requisite
corporate power and authority to enter into this Agreement and to consummate the
transactions contemplated hereby, subject in the case of the consummation of the
Merger to the  adoption of this  Agreement by the Required MCI Votes (as defined
in Section  3.1(f)).  The  execution  and  delivery  of this  Agreement  and the
consummation of the transactions  contemplated  hereby have been duly authorized
by all necessary corporate action on the part of MCI, subject in the case of the
consummation of the Merger to the adoption of this Agreement by the Required MCI
Votes.  This  Agreement  has  been  duly  executed  and  delivered  by  MCI  and
constitutes  a valid and binding  agreement  of MCI,  enforceable  against it in
accordance  with its  terms,  except as such  enforceability  may be  limited by
bankruptcy, insolvency, reorganization,  moratorium and similar laws relating to
or affecting creditors  generally,  by general equity principles  (regardless of
whether such  enforceability  is considered in a proceeding in equity or at law)
or by an implied covenant of good faith and fair dealing.

                  (ii) The execution and delivery of this  Agreement does not or
will not, as the case may be, and the  consummation  of the Merger and the other
transactions  contemplated  hereby  will not,  conflict  with,  or result in any
violation of, or constitute a default (with or without  notice or lapse of time,
or both) under, or give rise to a right of termination,  amendment, cancellation
or  acceleration  of any obligation or the loss of a material  benefit under, or
the creation of a lien, pledge,  security interest,  charge or other encumbrance
on any assets (any such


<PAGE>


                                       11



conflict, violation, default, right of termination,  amendment,  cancellation or
acceleration, loss or creation, a "Violation") pursuant to: (A) any provision of
the certificate of  incorporation or by-laws of MCI or any Subsidiary of MCI, or
(B) except as would not have a Material  Adverse  Effect on MCI and,  subject to
obtaining   or  making  the   consents,   approvals,   orders,   authorizations,
registrations,  declarations  and filings  referred to in paragraph (iii) below,
any loan or credit agreement,  note, mortgage,  bond, indenture,  lease, benefit
plan or other agreement, obligation,  instrument, permit, concession, franchise,
license,  judgment,  order, decree, statute, law, ordinance,  rule or regulation
applicable  to MCI or any  Subsidiary of MCI or their  respective  properties or
assets.

                  (iii) No  consent,  approval,  order or  authorization  of, or
registration,  declaration or filing with, any supranational,  national,  state,
municipal  or  local  government,  any  instrumentality,   subdivision,   court,
administrative   agency  or  commission  or  other  authority  thereof,  or  any
quasi-governmental or private body exercising any regulatory,  taxing, importing
or other governmental or  quasi-governmental  authority,  including the European
Union (a  "Governmental  Entity"),  is required by or with respect to MCI or any
Subsidiary  of MCI in  connection  with  the  execution  and  delivery  of  this
Agreement by MCI or the  consummation  of the Merger and the other  transactions
contemplated  hereby,  except for those required under or in relation to (A) the
Hart-Scott-Rodino  Antitrust  Improvements  Act of 1976,  as  amended  (the "HSR
Act"), and Council Regulation (EEC) No. 4064/89 ("Regulation 4064/89"),  (B) the
Communications  Act of 1934,  as amended  (the  "Communications  Act"),  and any
rules,   regulations,   practices  and  policies   promulgated  by  the  Federal
Communications  Commission ("FCC"), (C) state securities or "blue sky" laws (the
"Blue Sky Laws"),  (D) the Securities  Act of 1933, as amended (the  "Securities
Act"), (E) the Securities Exchange Act of 1934, as amended (the "Exchange Act"),
(F) the DGCL with respect to the filing of the Delaware  Certificate  of Merger,
(G) laws, rules,  regulations,  practices and orders of any state public service
commissions ("PUCs"), foreign telecommunications  regulatory agencies or similar
state or foreign  regulatory  bodies,  (H) rules and regulations of NASDAQ,  (I)
antitrust  or  other  competition  laws of  other  jurisdictions,  and (J)  such
consents,  approvals, orders,  authorizations,  registrations,  declarations and
filings the failure of which to make or obtain would not have a Material Adverse
Effect  on MCI.  Consents,  approvals,  orders,  authorizations,  registrations,
declarations  and filings  required under or in relation to any of the foregoing
clauses (A) through (I) are hereinafter referred to as "Required Consents."

                  (d)  Reports  and  Financial  Statements.  MCI has  filed  all
required reports,  schedules,  forms, statements and other documents required to
be filed by it with the  Securities  and Exchange  Commission  (the "SEC") since
January 1, 1996


<PAGE>


                                       12



(collectively,  including  all  exhibits  thereto,  the "MCI SEC  Reports").  No
Subsidiary  of MCI is required to file any form,  report or other  document with
the SEC.  None of the MCI SEC Reports,  as of their  respective  dates (and,  if
amended or  superseded  by a filing  prior to the date of this  Agreement or the
Closing Date,  then on the date of such  filing),  contained or will contain any
untrue  statement of a material fact or omitted or will omit to state a material
fact required to be stated therein or necessary to make the statements  therein,
in light of the circumstances  under which they were made, not misleading.  Each
of the financial  statements  (including the related notes)  included in the MCI
SEC  Reports  presents  fairly,  in  all  material  respects,  the  consolidated
financial position and consolidated  results of operations and cash flows of MCI
and its  Subsidiaries as of the respective  dates or for the respective  periods
set forth  therein,  all in  conformity  with United States  generally  accepted
accounting  principles  ("U.S.  GAAP")  consistently  applied during the periods
involved  except as otherwise  noted  therein,  and subject,  in the case of the
unaudited  interim  financial  statements,  to  normal  and  recurring  year-end
adjustments  that have not been and are not  expected  to be material in amount.
All of such MCI SEC Reports, as of their respective dates (and as of the date of
any  amendment to the  respective  MCI SEC  Report),  complied as to form in all
material respects with the applicable requirements of the Securities Act and the
Exchange Act and the rules and regulations promulgated thereunder.

                  (e) Information Supplied. (i) None of the information supplied
or to be supplied by MCI for inclusion or  incorporation by reference in (A) the
registration  statement on Form S-4 (as defined in Section 5.1) to be filed with
the SEC by WorldCom in connection with the issuance of the WorldCom Common Stock
in the Merger will,  at the time the Form S-4 is filed with the SEC, at any time
it is amended or  supplemented  or at the time it  becomes  effective  under the
Securities Act, contain any untrue statement of a material fact or omit to state
any  material  fact  required  to be stated  therein  or  necessary  to make the
statements  therein not misleading and (B) the Joint Proxy  Statement/Prospectus
(as  defined  in  Section  5.1)  included  in the  Form S-4  related  to the MCI
Stockholders Meeting and the WorldCom  Stockholders Meeting (each, as defined in
Section 5.1) and the WorldCom  Common Stock to be issued in the Merger will,  on
the date it is first mailed to MCI  stockholders or WorldCom  Stockholders or at
the time of the MCI Stockholders Meeting or the WorldCom  Stockholders  Meeting,
contain any untrue  statement  of a material  fact or omit to state any material
fact required to be stated  therein or necessary in order to make the statements
therein,  in  light  of the  circumstances  under  which  they  were  made,  not
misleading.
                  (ii)  Notwithstanding the foregoing provisions of this Section
3.1(e),  no representation or warranty is made by MCI with respect to statements
made  or  incorporated  by  reference  in  the  Form  S-4  or  the  Joint  Proxy
Statement/Prospectus based on


<PAGE>


                                       13



information supplied by WorldCom for inclusion or incorporation
by reference therein.

                  (f) Vote Required.  The  affirmative  vote of the holders of a
majority of the  outstanding  shares of Ordinary Common Stock and Class A Common
Stock voting  together as a single class and, if the Effective Time occurs prior
to October l, 1998,  the  affirmative  vote of the  holders of a majority of the
outstanding  shares of Class A Common Stock  voting  separately  as a class,  in
either case to approve the Merger (the "Required MCI Votes"), are the only votes
of the holders of any class or series of MCI capital  stock  necessary  to adopt
this Agreement and approve the transactions contemplated hereby.

                  (g) Rights Agreement. The Rights Agreement has been amended so
as to provide  that neither  WorldCom  nor Merger Sub will become an  "Acquiring
Person," and that no "Shares  Acquisition Date" or "Distribution  Date" (as such
terms are  defined  in the  Rights  Agreement)  will  occur,  as a result of the
approval,  execution or delivery of this  Agreement or the  consummation  of the
transactions contemplated hereby.

                  (h) Brokers or Finders. No agent,  broker,  investment banker,
financial advisor or other firm or Person is or will be entitled to any broker's
or finder's fee or any other similar commission or fee in connection with any of
the transactions contemplated by this Agreement,  except Lazard Freres & Co. LLC
and Lehman Brothers Inc.  (collectively,  the "Financial Advisors"),  whose fees
and expenses will be paid by MCI in accordance  with MCI's  agreement  with such
firms,  based  upon  arrangements  made by or on  behalf  of MCI and  previously
disclosed to WorldCom.

                  (i)  Opinions of  Financial  Advisors.  MCI has  received  the
opinion of each of the Financial Advisors,  dated the date of this Agreement, to
the effect  that,  as of such date,  the Merger  Consideration  is fair,  from a
financial  point of view, to the holders of Ordinary Common Stock (the "Fairness
Opinions"),  a copy of each of  which  opinions  have  been  made  available  to
WorldCom.



<PAGE>


                                       14



                  (j)  Affiliate  Letter.  On or  prior  to the  date of the MCI
Stockholder  Meeting,  MCI will deliver to WorldCom a letter (the "MCI Affiliate
Letter")  identifying  all persons who are  "affiliates"  of MCI for purposes of
Rule 145 under the Securities Act ("Rule 145"). On or prior to the Closing Date,
MCI will deliver on behalf of each person  identified as an  "affiliate"  in the
MCI  Affiliate  Letter  (other  than  BT) a  written  agreement  (an  "Affiliate
Agreement") in connection with restrictions on affiliates under Rule 145.

                  3.2 Representations and Warranties of WorldCom.  Except as set
forth in the WorldCom  Disclosure Schedule delivered by WorldCom to MCI prior to
the execution of this  Agreement  (the  "WorldCom  Disclosure  Schedule")  (each
section of which  qualifies  the  correspondingly  numbered  representation  and
warranty or covenant to the extent specified  therein),  WorldCom represents and
warrants to MCI as follows:

                  (a)  Organization,  Standing  and Power.  Each of WorldCom and
each of its Subsidiaries is a corporation  duly organized,  validly existing and
in  good  standing  under  the  laws of its  jurisdiction  of  incorporation  or
organization,  has all requisite  power and authority to own,  lease and operate
its properties  and to carry on its business as now being  conducted and is duly
qualified and in good standing to do business in each  jurisdiction in which the
nature of its business or the ownership or leasing of its properties  makes such
qualification necessary other than in such jurisdictions where the failure so to
qualify or to be in good  standing  would  not,  either  individually  or in the
aggregate,  have a  Material  Adverse  Effect  on  WorldCom.  The  copies of the
certificate  of  incorporation  and  by-laws of WorldCom  which were  previously
furnished to MCI are true,  complete and correct  copies of such documents as in
effect on the date of this Agreement.

                  (b)  Capital  Structure.  (i)  As of  November  5,  1997,  the
authorized  capital stock of WorldCom  consisted of (A) 2,500,000,000  shares of
WorldCom  Common  Stock of which  908,380,987  shares were  outstanding  and (B)
50,000,000  shares of Preferred  Stock,  par value $.01 per share,  of which (1)
94,992 shares have been designated Series A 8% Cumulative  Convertible Preferred
Stock  ("WorldCom  Series A  Preferred  Stock"),  of which  94,992  shares  were
outstanding, (2) 15,000,000 shares have been designated Series B Preferred Stock
("WorldCom  Series  B  Preferred  Stock"),   of  which  12,441,817  shares  were
outstanding  and (3)  2,500,000  shares  have  been  designated  Series 3 Junior
Participating  Preferred  Stock and reserved for issuance  upon  exercise of the
rights (the "Purchase  Rights")  distributed  to the holders of WorldCom  Common
Stock  pursuant  to the Rights  Agreement  dated as of August 25,  1996  between
WorldCom  and  Bank  of  New  York,  as  rights  agent  (the  "WorldCom   Rights
Agreement").  Since November 5, 1997 to the date of this  Agreement,  there have
been no issuances of shares of the capital stock of WorldCom or any


<PAGE>


                                       15



other  securities of WorldCom other than issuances of shares pursuant to options
or rights outstanding as of November 5, 1997 under the Benefit Plans (as defined
in Section  8.11(h))  of  WorldCom.  All issued  and  outstanding  shares of the
capital stock of WorldCom are duly  authorized,  validly issued,  fully paid and
nonassessable,  and no class of capital stock is entitled to preemptive  rights.
There were  outstanding  as of November  5, 1997 no  options,  warrants or other
rights to acquire  capital stock from WorldCom other than pursuant to WorldCom's
pending  acquisitions  as of the date  hereof.  No options or  warrants or other
rights to acquire  capital stock from WorldCom have been issued or granted since
November 5, 1997 to the date of this Agreement.

                  (ii) As of the date of this Agreement,  no bonds,  debentures,
notes or other  indebtedness of WorldCom having the right to vote on any matters
on  which   stockholders  may  vote  ("WorldCom  Voting  Debt")  are  issued  or
outstanding.

                  (iii) Except as otherwise set forth in this Section 3.2(b), as
of the date of this  Agreement,  there  are no  securities,  options,  warrants,
calls, rights, commitments, agreements, arrangements or undertakings of any kind
to which WorldCom or any of its  Subsidiaries is a party or by which any of them
is bound  obligating  WorldCom or any of its  Subsidiaries to issue,  deliver or
sell,  or cause to be issued,  delivered or sold,  additional  shares of capital
stock or other  voting  securities  of  WorldCom or any of its  Subsidiaries  or
obligating  WorldCom or any of its Subsidiaries to issue, grant, extend or enter
into any such security,  option,  warrant, call, right,  commitment,  agreement,
arrangement  or  undertaking.  As of the date of this  Agreement,  there  are no
outstanding  obligations of WorldCom or any of its  Subsidiaries  to repurchase,
redeem or  otherwise  acquire any shares of capital  stock of WorldCom or any of
its Subsidiaries.

                  (c)  Authority;  No Conflicts.  (i) WorldCom has all requisite
corporate  power and authority to enter into this Agreement and,  subject to the
adoption of this Agreement by the Required  WorldCom Vote (as defined in Section
3.2(g)), to issue the shares of WorldCom Common Stock to be issued in the Merger
(the "Share  Issuance").  The execution  and delivery of this  Agreement and the
consummation of the transactions  contemplated  hereby have been duly authorized
by all  necessary  corporate  action  on the part of  WorldCom,  subject  to the
approval  by  the  stockholders  of  WorldCom  of the  Share  Issuance  and  the
affirmative  vote of a majority of the outstanding  voting power of the WorldCom
Stock (as defined in Section 3.2(g)) to amend the  Certificate of  Incorporation
of WorldCom to change its name as set forth in Section 5.2.  This  Agreement has
been duly executed and delivered by WorldCom and constitutes a valid and binding
agreement  of WorldCom,  enforceable  against it in  accordance  with its terms,
except as such enforceability may be limited by


<PAGE>


                                       16



bankruptcy, insolvency, reorganization,  moratorium and similar laws relating to
or affecting creditors  generally,  by general equity principles  (regardless of
whether such  enforceability  is considered in a proceeding in equity or at law)
or by an implied covenant of good faith and fair dealing.

                  (ii) The execution and delivery of this  Agreement does not or
will not, as the case may be, and the  consummation  of the Merger and the other
transactions  contemplated  hereby  will  not,  conflict  with,  or  result in a
Violation  pursuant to: (A) any provision of the certificate of incorporation or
by-laws of WorldCom or any Subsidiary of WorldCom,  (B) except as would not have
a Material  Adverse  Effect on WorldCom and,  subject to obtaining or making the
consents,  approvals, orders,  authorizations,  registrations,  declarations and
filings  referred to in  paragraph  (iii) below,  any loan or credit  agreement,
note,  mortgage,  bond,  indenture,  lease,  benefit  plan or  other  agreement,
obligation, instrument, permit, concession, franchise, license, judgment, order,
decree,  statute,  law, ordinance,  rule or regulation applicable to WorldCom or
any Subsidiary of WorldCom or their respective properties or assets.

                  (iii) No  consent,  approval,  order or  authorization  of, or
registration, declaration or filing with, any Governmental Entity is required by
or with respect to WorldCom or any Subsidiary of WorldCom in connection with the
execution and delivery of this Agreement by WorldCom or the  consummation of the
Merger and the other transactions  contemplated hereby,  except for the Required
Consents and such consents,  approvals, orders,  authorizations,  registrations,
declarations and filings the failure of which to make or obtain would not have a
Material Adverse Effect on WorldCom.

                  (d) Reports and Financial  Statements.  WorldCom has filed all
required reports,  schedules,  forms, statements and other documents required to
be filed by it with the SEC since January 1, 1996  (collectively,  including all
exhibits  thereto,  the  "WorldCom SEC  Reports").  No Subsidiary of WorldCom is
required to file any form,  report or other  document  with the SEC. None of the
WorldCom  SEC  Reports,  as of  their  respective  dates  (and,  if  amended  or
superseded by a filing prior to the date of this  Agreement or the Closing Date,
then on the date of such filing), contained or will contain any untrue statement
of a material  fact or omitted or will omit to state a material fact required to
be stated therein or necessary to make the statements  therein,  in light of the
circumstances under which they were made, not misleading.  Each of the financial
statements  (including the related  notes)  included in the WorldCom SEC Reports
presents fairly, in all material respects,  the consolidated  financial position
and  consolidated  results  of  operations  and cash flows of  WorldCom  and its
Subsidiaries as of the respective dates or for the respective  periods set forth
therein, all in conformity with U.S. GAAP consistently applied


<PAGE>


                                       17



during the periods involved except as otherwise noted therein,  and subject,  in
the case of the unaudited interim financial statements,  to normal and recurring
year-end  adjustments  that have not been and are not expected to be material in
amount.  All of such WorldCom SEC Reports,  as of their respective dates (and as
of the date of any amendment to the respective WorldCom SEC Report), complied as
to form  in all  material  respects  with  the  applicable  requirements  of the
Securities  Act and the Exchange Act and the rules and  regulations  promulgated
thereunder.

                  (e) Information Supplied. (i) None of the information supplied
or to be supplied by WorldCom for inclusion or incorporation by reference in (A)
the Form S-4 will,  at the time the Form S-4 is filed with the SEC,  at any time
it is amended or  supplemented  or at the time it  becomes  effective  under the
Securities Act, contain any untrue statement of a material fact or omit to state
any  material  fact  required  to be stated  therein  or  necessary  to make the
statements therein not misleading,  and (B) the Joint Proxy Statement/Prospectus
will,  on  the  date  it  is  first  mailed  to  MCI  stockholders  or  WorldCom
Stockholders  or at the time of the MCI  Stockholders  Meeting  or the  WorldCom
Stockholders Meeting, contain any untrue statement of a material fact or omit to
state any material fact  required to be stated  therein or necessary in order to
make the statements therein, in light of the circumstances under which they were
made, not misleading. The Form S-4 and the Joint Proxy Statement/Prospectus will
comply as to form in all material respects with the requirements of the Exchange
Act and the Securities Act and the rules and regulations of the SEC thereunder.

                  (ii)  Notwithstanding the foregoing provisions of this Section
3.2(e),  no  representation  or  warranty is made by  WorldCom  with  respect to
statements  made or incorporated by reference in the Form S-4 or the Joint Proxy
Statement/Prospectus  based on  information  supplied  by MCI for  inclusion  or
incorporation by reference therein.

                  (f) Absence of Certain Changes or Events.  Except as disclosed
in the WorldCom  SEC Reports  filed prior to the date of this  Agreement,  since
December 31, 1996 until the date hereof,  WorldCom and its Subsidiaries have not
incurred  any  material  liability,  except in the  ordinary  course of business
consistent  with past  practice,  nor has there been any change in the business,
financial  condition  or  results  of  operations  of  WorldCom  or  any  of its
Subsidiaries or any event involving  WorldCom or any of its  Subsidiaries  which
has had, or is reasonably likely to have, a Material Adverse Effect on WorldCom.

                  (g) Vote Required.  The affirmative  vote of holders of shares
of WorldCom Common Stock,  WorldCom Series A Preferred Stock and WorldCom Series
B Preferred Stock  (collectively,  "WorldCom Stock")  representing a majority of
the total votes cast


<PAGE>


                                       18



at a meeting of the holders of  outstanding  shares of WorldCom Stock all voting
together as a single class (the "Required  WorldCom Vote"),  is the only vote of
the  holders  of any class or series of  WorldCom  capital  stock  necessary  to
approve the Share Issuance. The affirmative vote of holders of a majority of the
outstanding  voting power of the shares of WorldCom Stock,  voting together as a
single class (the "Charter  Amendment Vote"), is the only vote of holders of any
class or series of WorldCom  capital stock necessary to approve the amendment to
WorldCom's  Certificate of Incorporation  set forth in Section 5.2 (the "Charter
Amendment").

                  (h) Brokers or Finders. No agent,  broker,  investment banker,
financial advisor or other firm or Person is or will be entitled to any broker's
or finder's fee or any other similar commission or fee in connection with any of
the transactions  contemplated by this Agreement based upon arrangements made by
or on behalf of WorldCom,  except Salomon  Brothers Inc, whose fees and expenses
will be paid by WorldCom in accordance with WorldCom's  agreement with such firm
based  upon  arrangements  made  by or on  behalf  of  WorldCom  and  previously
disclosed to MCI.

                  (i) Affiliate  Letter. On or prior to the date of the WorldCom
Stockholder  Meeting,  WorldCom  will  deliver  to MCI a letter  (the  "WorldCom
Affiliate Letter")  identifying all persons who are "affiliates" of WorldCom for
purpose of Rule 145. On or prior to the Closing  Date,  WorldCom will deliver on
behalf of each person  identified as an  "affiliate"  in the WorldCom  Affiliate
Letter an Affiliate  Agreement in  connection  with  restrictions  on affiliates
under Rule 145.

                  3.3 Representations and Warranties of WorldCom and Merger Sub.
WorldCom and Merger Sub represent and warrant to MCI as follows:

                  (a)  Organization  and  Corporate  Power.   Merger  Sub  is  a
corporation duly  incorporated,  validly existing and in good standing under the
laws of Delaware. Merger Sub is a direct wholly-owned subsidiary of WorldCom.

                  (b)  Corporate  Authorization.  Merger  Sub has all  requisite
corporate power and authority to enter into this Agreement and to consummate the
transactions  contemplated  hereby.  The execution,  delivery and performance by
Merger  Sub  of  this  Agreement  and  the  consummation  by  Merger  Sub of the
transactions  contemplated  hereby have been duly  authorized  by all  necessary
corporate  action  on the part of  Merger  Sub.  This  Agreement  has been  duly
executed  and  delivered  by Merger  Sub and  constitutes  a valid  and  binding
agreement of Merger Sub,  enforceable  against it in accordance  with its terms,
except  as  such  enforceability  may  be  limited  by  bankruptcy,  insolvency,
reorganization,  moratorium  and other  similar  laws  relating to or  affecting
creditors generally, by general equity principles (regardless or whether


<PAGE>


                                       19



such  enforceability is considered in a proceeding in equity or at law) or by an
implied covenant of good faith and fair dealing.

                  (c) Non-Contravention. The execution, delivery and performance
by Merger  Sub of this  Agreement  and the  consummation  by  Merger  Sub of the
transactions contemplated hereby do not and will not contravene or conflict with
the certificate of incorporation or by-laws of Merger Sub.

                  (d) No Business  Activities.  Merger Sub has not conducted any
activities  other than in connection  with the  organization  of Merger Sub, the
purchase of Ordinary Common Stock in open-market  transactions,  the negotiation
and  execution  of this  Agreement  and  the  consummation  of the  transactions
contemplated hereby. Merger Sub has no Subsidiaries.


                                   ARTICLE IV

                    COVENANTS RELATING TO CONDUCT OF BUSINESS

                  4.1 Covenants of MCI.  During the period from the date of this
Agreement and continuing  until the Effective  Time, MCI agrees as to itself and
its  Subsidiaries  that (except as expressly  contemplated  or permitted by this
Agreement  or as  otherwise  indicated  on the  MCI  Disclosure  Schedule  or as
required by a  Governmental  Entity of competent  jurisdiction  or to the extent
that WorldCom shall otherwise consent in writing):

                  (a) Ordinary Course.  (i) MCI and its Subsidiaries shall carry
on their respective  businesses in the usual, regular and ordinary course in all
material respects, in substantially the same manner as heretofore conducted, and
shall use all  reasonable  efforts to preserve  intact  their  present  lines of
business,  maintain their rights and franchises and preserve their relationships
with customers,  suppliers and others having business  dealings with them to the
end that their ongoing  businesses shall not be impaired in any material respect
at  the  Effective  Time;  provided,  however,  that  no  action  by  MCI or its
Subsidiaries  with  respect  to  matters  specifically  addressed  by any  other
provision of this Section 4.1 shall be deemed a breach of this Section 4.1(a)(i)
unless  such  action  would  constitute  a breach  of one or more of such  other
provisions.

                  (ii)  MCI  shall  not,   and  shall  not  permit  any  of  its
Subsidiaries  to, (A) enter into any new material  line of business or (B) incur
or commit to any capital expenditures other than capital  expenditures  incurred
or committed to in the ordinary course of business consistent with past practice
and which,  together with all such expenditures  incurred or committed to during
any fiscal year, are not in excess of 105% of the aggregate amounts set forth in
Section 4.1(a) of the MCI Disclosure Schedule.


<PAGE>


                                       20



                  (b) Dividends;  Changes in Share  Capital.  MCI shall not, and
shall not  permit any of its  Subsidiaries  to,  and shall not  propose  to, (i)
declare or pay any dividends on or make other distributions in respect of any of
its capital stock,  except (A) MCI may continue the  declaration  and payment of
regular  semiannual  cash  dividends  not in excess  of $0.025  per share of MCI
Common  Stock,  in each  case  with  usual  record  and  payment  dates for such
dividends in  accordance  with MCI's past  practice and (B)  dividends by wholly
owned Subsidiaries of MCI, (ii) split,  combine or reclassify any of its capital
stock or issue or authorize or propose the issuance of any other  securities  in
respect of, in lieu of or in  substitution  for,  shares of its  capital  stock,
except  for any such  transaction  by a wholly  owned  Subsidiary  of MCI  which
remains a wholly owned Subsidiary  after  consummation of such  transaction,  or
(iii) repurchase, redeem or otherwise acquire any shares of its capital stock or
any securities  convertible  into or  exercisable  for any shares of its capital
stock except for the purchase  from time to time by MCI of MCI Common Stock (and
the associated  Rights) in the ordinary course of business  consistent with past
practice in connection with the MCI Benefit Plans.

                  (c)  Issuance  of  Securities.  Except as set forth in Section
5.7,  MCI shall not,  and shall not permit any of its  Subsidiaries  to,  issue,
deliver or sell, or authorize or propose the issuance,  delivery or sale of, any
shares of its capital stock of any class,  any MCI Voting Debt or any securities
convertible  into or  exercisable  for,  or any  rights,  warrants or options to
acquire,  any such shares or MCI Voting Debt, or enter into any  agreement  with
respect to any of the foregoing, other than (i) the issuance of MCI Common Stock
(and the associated  Rights) upon the exercise of stock options or in connection
with  other  stock-based  benefits  plans  outstanding  on the  date  hereof  in
accordance with their present terms, (ii) issuances by a wholly owned Subsidiary
of MCI of  capital  stock  to  such  Subsidiary's  parent,  (iii)  issuances  in
accordance  with the Rights  Agreement  or (iv)  issuances  of shares,  options,
rights or other awards and amendments to equity-related  awards, in the ordinary
course of business and consistent with past practice pursuant to the MCI Benefit
Plans.

                  (d)  Governing  Documents.  Except to the extent  required  to
comply with their respective obligations hereunder,  required by law or required
by the rules and regulations of NASDAQ, MCI and its material  Subsidiaries shall
not amend, in the case of Subsidiaries,  in any material respect,  or propose to
amend their respective certificates of incorporation, by-laws or other governing
documents.

                  (e) No  Acquisitions.  Other than  acquisitions in existing or
related   lines  of  business  of  MCI  the  fair  market  value  of  the  total
consideration  (including the value of indebtedness or other liability  acquired
or assumed) for which


<PAGE>


                                       21



does not exceed  $325  million in the  aggregate,  MCI shall not,  and shall not
permit  any of its  Subsidiaries  to,  acquire or agree to acquire by merging or
consolidating  with,  or by  purchasing a  substantial  equity  interest in or a
substantial  portion of the assets of, or by any other  manner,  any business or
any  corporation,  partnership,  association or other business  organization  or
division thereof or otherwise acquire or agree to acquire any assets (other than
the  acquisition of assets used in the operations of the business of MCI and its
Subsidiaries  in the ordinary  course);  provided,  however,  that the foregoing
shall not prohibit  (x) internal  reorganizations  or  consolidations  involving
existing  Subsidiaries  of MCI or (y) the  creation of new  Subsidiaries  of MCI
organized  to  conduct  or  continue  activities  otherwise  permitted  by  this
Agreement.

                  (f) No Dispositions.  Other than (i) internal  reorganizations
or  consolidations  involving  existing  Subsidiaries of MCI, (ii)  dispositions
referred to in MCI SEC Reports  filed  prior to the date of this  Agreement  and
(iii) as may be required by or in conformance with law or regulation in order to
permit or facilitate the consummation of the transactions  contemplated  hereby,
MCI shall not,  and shall not  permit any  Subsidiary  of MCI to,  sell,  lease,
encumber or otherwise dispose of, or agree to sell, lease, encumber or otherwise
dispose of, any of its assets  (including  capital stock of Subsidiaries of MCI)
which are material, individually or in the aggregate, to MCI.

                  (g)  Indebtedness.  MCI shall not, and shall not permit any of
its Subsidiaries to, (i) make any loans,  advances or capital  contributions to,
or investments in, any other Person, other than by MCI or a Subsidiary of MCI to
or in MCI or any Subsidiary of MCI or (ii) pay, discharge or satisfy any claims,
liabilities  or  obligations   (absolute,   accrued,   asserted  or  unasserted,
contingent or otherwise), other than indebtedness, issuances of debt securities,
guarantees,  loans,  advances,  capital  contributions,  investments,  payments,
discharges or  satisfactions  incurred or committed to in the ordinary course of
business consistent with past practice.

                  (h)  Tax-Free  Qualification.  MCI  shall  not,  and shall not
permit any of its  Subsidiaries to, take any action that would prevent or impede
the Merger from qualifying as a reorganization under Section 368 of the Code.

                  (i) Other Actions.  MCI shall not, and shall not permit any of
its  Subsidiaries  to, take any action that would,  or that could  reasonably be
expected to, result in, except as otherwise permitted by Section 5.5, any of the
conditions to the Merger set forth in Article VI not being satisfied.

                  (j)  Accounting  Methods;  Income  Tax  Elections.  Except  as
disclosed in MCI SEC Reports  filed prior to the date of this  Agreement,  or as
required by a Governmental Entity, MCI shall not


<PAGE>


                                       22



change its methods of  accounting  in effect at  December  31,  1996,  except as
required by changes in U.S. GAAP as concurred in by MCI's independent  auditors.
MCI shall not (i) change its fiscal year or (ii) make any material Tax election,
other than in the ordinary  course of business  consistent  with past  practice,
without consultation with WorldCom.

                  (k) MCI Rights Agreement.  Except as provided in Section 5.10,
MCI shall not amend,  modify or waive any provision of the MCI Rights Agreement,
and  shall  not take any  action to redeem  the  Rights  or  render  the  Rights
inapplicable to any transaction,  other than to permit another  transaction that
the MCI Board has  determined  is a  Superior  Proposal,  to be  consummated  no
earlier than December 31, 1998.

                  4.2 Covenants of WorldCom.  During the period from the date of
this Agreement and continuing  until the Effective  Time,  WorldCom agrees as to
itself and its Subsidiaries that (except as expressly  contemplated or permitted
by this Agreement or as otherwise  indicated on the WorldCom Disclosure Schedule
or as required by a  Governmental  Entity of  competent  jurisdiction  or to the
extent that MCI shall otherwise consent in writing):

                  (a) Ordinary Course.  (i) WorldCom and its Subsidiaries  shall
carry on their respective  businesses in the usual,  regular and ordinary course
in all  material  respects,  in  substantially  the same  manner  as  heretofore
conducted, and shall use all reasonable efforts to preserve intact their present
lines of business,  maintain  their  rights and  franchises  and preserve  their
relationships with customers, suppliers and others having business dealings with
them to the end that  their  ongoing  businesses  shall not be  impaired  in any
material  respect at the Effective Time;  provided,  however,  that no action by
WorldCom or its Subsidiaries with respect to matters  specifically  addressed by
any  other  provisions  of this  Section  4.2  shall be  deemed a breach of this
Section 4.2(a)(i) unless such action would constitute a breach of one or more of
such other provisions.

                  (ii)  WorldCom  shall  not,  and shall not  permit  any of its
Subsidiaries  to, (A) enter into any new material  line of business  (other than
incidentally  as  part  of a  larger  acquisition  within  an  existing  line of
business) or (B) incur or commit to any capital  expenditures other than capital
expenditures  incurred  or  committed  to in the  ordinary  course  of  business
consistent with past practice.

                  (b) Dividends;  Changes in Share Capital.  WorldCom shall not,
and shall not permit any of its  Subsidiaries  to, and shall not propose to, (i)
declare or pay any dividends on or make other distributions in respect of any of
its capital stock,  except (A) WorldCom may continue the declaration and payment
of regular  quarterly  cash dividends in amounts  consistent  with past practice
(including increases in such amounts consistent with


<PAGE>


                                       23



past practice) and (B) dividends by wholly owned Subsidiaries of WorldCom,  (ii)
split,  combine or reclassify  any of its capital stock or issue or authorize or
propose  the  issuance of any other  securities  in respect of, in lieu of or in
substitution  for, shares of its capital stock,  except for any such transaction
by a wholly owned Subsidiary of WorldCom which remains a wholly owned Subsidiary
after  consummation of such transaction,  (iii) repurchase,  redeem or otherwise
acquire any shares of its capital stock or any  securities  convertible  into or
exercisable  for any shares of its capital  stock except for the  purchase  from
time to time by WorldCom  of WorldCom  Common  Stock in the  ordinary  course of
business  consistent with past practice in connection with share options,  share
incentive schemes,  profit sharing schemes or other benefit plans of WorldCom or
repurchases  of shares of  WorldCom  Common  Stock in open  market or  privately
negotiated transactions other than during the Measurement Period.

                  (c) Issuance of Securities.  WorldCom shall not, and shall not
permit any of its  Subsidiaries  to,  issue,  deliver or sell,  or  authorize or
propose the  issuance,  delivery or sale of, any shares of its capital  stock of
any class,  any  WorldCom  Voting  Debt or any  securities  convertible  into or
exercisable for, or any rights,  warrants or options to acquire, any such shares
or WorldCom  Voting Debt, or enter into any agreement with respect to any of the
foregoing,  other  than (i) the  issuance  of  WorldCom  Common  Stock  upon the
exercise of stock  options,  (ii)  issuances  by a wholly  owned  Subsidiary  of
WorldCom of capital stock to such  Subsidiary's  parent or another  wholly owned
Subsidiary of WorldCom,  (iii) issuances of options,  awards,  and amendments to
equity-related  awards pursuant to WorldCom benefit plans as in effect from time
to time, (iv) issuances in accordance with the WorldCom Rights  Agreement or (v)
issuances in respect of any  acquisitions by WorldCom or its  subsidiaries  that
are currently pending  ("WorldCom  Pending  Acquisitions") on the date hereof or
are permitted pursuant to Section 4.2(e).

                  (d)  Governing  Documents.  Except to the extent  required  to
comply with their respective obligations hereunder,  required by law or required
by the rules and regulations of NASDAQ,  WorldCom and its material  Subsidiaries
shall not  amend,  in the case of  Subsidiaries,  in any  material  respect,  or
propose to amend their  respective  certificates  of  incorporation,  by-laws or
other governing documents.

                  (e) No  Acquisitions.  Other than  acquisitions in existing or
related  lines of  business  of  WorldCom  the fair  market  value of the  total
consideration  (including the value of indebtedness or other liability  acquired
or assumed)  for which does not exceed $525 million in the  aggregate  and other
than WorldCom Pending  Acquisitions,  WorldCom,  shall not, and shall not permit
any  of its  Subsidiaries  to,  acquire  or  agree  to  acquire  by  merging  or
consolidating  with,  or by  purchasing a  substantial  equity  interest in or a
substantial portion of the assets of, or


<PAGE>


                                       24



by any other manner, any business or any corporation,  partnership,  association
or other business organization or division thereof or otherwise acquire or agree
to acquire any assets (other than the acquisition of assets used in the ordinary
course);  provided,  however, that the foregoing shall not prohibit (x) internal
reorganizations or consolidations involving existing Subsidiaries of WorldCom or
(y) the  creation  of new  Subsidiaries  of  WorldCom  organized  to  conduct or
continue activities otherwise permitted by this Agreement.

                  (f) No Dispositions.  Other than (i) internal  reorganizations
or consolidations involving existing Subsidiaries of WorldCom, (ii) dispositions
referred to in WorldCom  SEC Reports  filed prior to the date of this  Agreement
and (iii) as may be  required by or in  conformance  with law or  regulation  in
order to permit or facilitate the consummation of the transactions  contemplated
hereby,  WorldCom shall not, and shall not permit any Subsidiary of WorldCom to,
sell,  lease,  encumber or  otherwise  dispose of, any of its assets  (including
capital stock of Subsidiaries  of WorldCom) which are material,  individually or
in the aggregate, to WorldCom.

                  (g) Indebtedness. WorldCom shall not, and shall not permit any
of its  Subsidiaries to, (i) make any loans,  advances or capital  contributions
to, or investments in, any other Person,  other than by WorldCom or a Subsidiary
of  WorldCom  to or in  WorldCom  or any  Subsidiary  of  WorldCom  or (ii) pay,
discharge or satisfy any claims, liabilities or obligations (absolute,  accrued,
asserted or  unasserted,  contingent  or  otherwise),  other than  indebtedness,
issuances   of   debt   securities,   guarantees,   loans,   advances,   capital
contributions,  investments,  payments,  discharges or satisfactions incurred or
committed to in the ordinary course of business consistent with past practice.

                  (h) Tax-Free Qualification.  WorldCom shall not, and shall not
permit any of its  Subsidiaries to, take any action that would prevent or impede
the Merger from qualifying as a reorganization under Section 368 of the Code.

                  (i) Other  Actions.  WorldCom  shall not, and shall not permit
any of its Subsidiaries to, take any action that would, or that could reasonably
be  expected  to,  result in any of the  conditions  to the  Merger set forth in
Article VI not being satisfied.

                  (j)  Accounting  Methods;  Income  Tax  Elections.  Except  as
disclosed in WorldCom SEC Reports filed prior to the date of this Agreement,  or
as required by a Governmental  Entity,  WorldCom shall not change its methods of
accounting in effect at December 31, 1996, except as required by changes in U.S.
GAAP as concurred in by WorldCom's independent auditors.  WorldCom shall not (i)
change its fiscal year or (ii) make any material Tax election,


<PAGE>


                                       25



other than in the ordinary  course of business  consistent  with past  practice,
without consultation with MCI.

                  (k) Acquisition  Proposals.  WorldCom shall not, and shall not
permit any of its  Subsidiaries  to, enter into any agreement with respect to or
consummate any transaction  contemplated by an Acquisition  Proposal (as defined
in Section 5.5).

                  (l)  WorldCom  Rights  Agreement.  WorldCom  shall not  amend,
modify or waive any  provision of the WorldCom  Rights  Agreement  and shall not
take any action to redeem the  WorldCom  Rights or render  the  WorldCom  Rights
inapplicable to any transaction.

                  4.3 Advice of Changes;  Governmental Filings. Each party shall
(a) confer on a regular and frequent basis with the other and (b) report (to the
extent  permitted  by  law  or  regulation  or  any  applicable  confidentiality
agreement)  on  operational  matters.  MCI and  WorldCom  shall file all reports
required  to be filed by each of them with the SEC (and all  other  Governmental
Entities)  between the date of this  Agreement and the Effective  Time and shall
(to the extent permitted by law or regulation or any applicable  confidentiality
agreement) deliver to the other party copies of all such reports,  announcements
and publications  promptly after the same are filed.  Subject to applicable laws
relating to the exchange of information, each of MCI and WorldCom shall have the
right to review in advance, and will consult with the other with respect to, all
the  information  relating  to the  other  party  and each of  their  respective
Subsidiaries,  which appears in any filings,  announcements or publications made
with, or written  materials  submitted  to, any third party or any  Governmental
Entity in connection with the  transactions  contemplated by this Agreement.  In
exercising  the  foregoing  right,  each of the  parties  hereto  agrees  to act
reasonably and as promptly as practicable. Each party agrees that, to the extent
practicable and as timely as practicable,  it will consult with, and provide all
appropriate  and  necessary  assistance  to, the other party with respect to the
obtaining of all permits,  consents,  approvals and  authorizations of all third
parties and  Governmental  Entities  necessary or advisable  to  consummate  the
transactions  contemplated  by this Agreement and each party will keep the other
party  apprised  of  the  status  of  matters  relating  to  completion  of  the
transactions contemplated hereby.

                  4.4 Transition Planning. Bernard J. Ebbers, as Chief Executive
Officer of WorldCom,  and Gerald H. Taylor,  as Chief Executive  Officer of MCI,
jointly shall be responsible for coordinating all aspects of transition planning
and   implementation   relating  to  the  Merger  and  the  other   transactions
contemplated  hereby. If either such person ceases to be Chief Executive Officer
of his company for any reason, such person's


<PAGE>


                                       26



successor  shall assume his  predecessor's  responsibilities  under this Section
4.4.  During the period  between the date of this  Agreement  and the  Effective
Time, Messrs.  Ebbers and Taylor jointly shall (i) examine various  alternatives
regarding  the manner in which to best  organize  and manage the  businesses  of
WorldCom  and MCI after the  Effective  Time and (ii)  coordinate  policies  and
strategies  with  respect to  regulatory  authorities  and bodies,  in all cases
subject to applicable law and regulation.

                  4.5 Control of Other Party's  Business.  Nothing  contained in
this Agreement shall give MCI,  directly or indirectly,  the right to control or
direct WorldCom's  operations prior to the Effective Time.  Nothing contained in
this Agreement shall give WorldCom, directly or indirectly, the right to control
or direct MCI's  operations  prior to the Effective Time. Prior to the Effective
Time,  each of MCI and WorldCom shall  exercise,  consistent  with the terms and
conditions  of  this  Agreement,  complete  control  and  supervision  over  its
respective operations.


                                    ARTICLE V

                              ADDITIONAL AGREEMENTS

                  5.1 Preparation of Proxy Statement;  MCI Stockholders Meeting.
(a) As promptly as practicable  following the date hereof,  WorldCom  shall,  in
cooperation with MCI, prepare and file with the SEC preliminary  proxy materials
which  shall  constitute  the  Joint  Proxy   Statement/Prospectus  (such  proxy
statement/prospectus,  and any  amendments or  supplements  thereto,  the "Joint
Proxy  Statement/Prospectus")  and an  amendment  to its  existing  registration
statement on Form S-4 with  respect to the issuance of WorldCom  Common Stock in
the Merger  (the  "Form  S-4").  The Joint  Proxy  Statement/Prospectus  will be
included in the Form S-4 as  WorldCom's  prospectus.  The Form S-4 and the Joint
Proxy Statement/Prospectus shall comply as to form in all material respects with
the  applicable  provisions of the  Securities  Act and the Exchange Act and the
rules  and  regulations  thereunder.  Each of  WorldCom  and MCI  shall  use all
reasonable  efforts  to have the  Form S-4  cleared  by the SEC as  promptly  as
practicable after filing with the SEC and to keep the Form S-4 effective as long
as is  necessary  to  consummate  the  Merger.  WorldCom  shall,  as promptly as
practicable  after  receipt  thereof,  provide  copies of any  written  comments
received  from the SEC with respect to the Joint Proxy  Statement/Prospectus  to
MCI  and  advise  MCI  of  any  oral   comments   with   respect  to  the  Proxy
Statement/Prospectus  received  from the SEC.  WorldCom  agrees that none of the
information   supplied  or  to  be  supplied  by  WorldCom   for   inclusion  or
incorporation  by  reference  in the Joint Proxy  Statement/Prospectus  and each
amendment or supplement  thereto, at the time of mailing thereof and at the time
of the MCI Stockholders Meeting or the WorldCom Stockholders Meeting, will


<PAGE>


                                       27



contain an untrue  statement of a material fact or omit to state a material fact
required to be stated  therein or necessary to make the statements  therein,  in
light of the  circumstances  under  which they were made,  not  misleading.  MCI
agrees  that  none of the  information  supplied  or to be  supplied  by MCI for
inclusion or incorporation by reference in the Joint Proxy  Statement/Prospectus
and each amendment or supplement  thereto, at the time of mailing thereof and at
the time of the MCI Stockholders Meeting or the WorldCom  Stockholders  Meeting,
will contain an untrue  statement of a material fact or omit to state a material
fact required to be stated therein or necessary to make the statements  therein,
in light of the  circumstances  under which they were made, not misleading.  For
purposes  of  the  foregoing,  it is  understood  and  agreed  that  information
concerning or related to WorldCom and the WorldCom  Stockholders Meeting will be
deemed to have been supplied by WorldCom and  information  concerning or related
to MCI and the MCI Stockholders Meeting shall be deemed to have been supplied by
MCI.  WorldCom  will  provide MCI with a  reasonable  opportunity  to review and
comment on any amendment or  supplement to the Joint Proxy  Statement/Prospectus
prior to filing such with the SEC,  and will provide MCI with a copy of all such
filings  made  with the SEC.  No  amendment  or  supplement  to the  information
supplied by MCI for inclusion in the Joint Proxy  Statement/Prospectus  shall be
made  without the  approval of MCI,  which  approval  shall not be  unreasonably
withheld or delayed.

                  (b) MCI  shall,  as  promptly  as  practicable  following  the
execution  of this  Agreement,  duly call,  give  notice of,  convene and hold a
meeting of its stockholders (the "MCI Stockholders  Meeting") for the purpose of
obtaining the Required MCI Votes with respect to the  transactions  contemplated
by this Agreement,  shall take all lawful action to solicit the adoption of this
Agreement  by the  Required  MCI Votes and the Board of  Directors  of MCI shall
recommend  adoption  of this  Agreement  by the  stockholders  of  MCI.  Without
limiting the  generality of the foregoing but subject to its rights  pursuant to
Sections 5.5 and 7.1(f),  MCI agrees that its obligations  pursuant to the first
sentence of this  Section  5.1(b)  shall not be  affected  by the  commencement,
public  proposal,  public  disclosure or communication to MCI of any Acquisition
Proposal.

                  (c) WorldCom shall,  as promptly as practicable  following the
execution  of this  Agreement,  duly call,  give  notice of,  convene and hold a
meeting  of its  stockholders  (the  "WorldCom  Stockholders  Meeting")  for the
purpose of obtaining the Required  WorldCom Vote and the Charter Amendment Vote,
shall take all lawful  action to solicit the approval of the Share  Issuance and
the Charter  Amendment by the Required  WorldCom Vote and the Charter  Amendment
Vote and the Board of  Directors  of WorldCom  shall  recommend  approval of the
transactions contemplated by this Agreement by the stockholders of WorldCom.



<PAGE>


                                       28



                  5.2 WorldCom Board of Directors;  Officers;  Headquarters; MCI
Name. (a) WorldCom shall take all necessary  action to reconstitute the Board of
Directors of WorldCom as of the Effective Time in accordance with Exhibit 5.2(a)
hereto.

                  (b)  WorldCom shall take all necessary action to cause
Bert C. Roberts, Jr. to be appointed Chairman of WorldCom as of
the Effective Time.

                  (c)  WorldCom  shall  take all action  necessary  to cause the
senior management of WorldCom to be as previously agreed between the parties.

                  (d) As of the Effective Time,  WorldCom shall be headquartered
in Jackson,  Mississippi and the Surviving Corporation shall be headquartered in
Washington D.C.

                  (e)  [Intentionally Omitted]

                  (f)  WorldCom  shall  take all action  necessary  to amend its
Certificate of Incorporation as of the Effective Time to change its name to "MCI
WorldCom".

                  5.3 Access to Information.  Upon reasonable  notice, MCI shall
(and  shall  cause  its  Subsidiaries  to)  afford to the  officers,  employees,
accountants,  counsel,  financial advisors and other representatives of WorldCom
reasonable  access during normal business hours,  during the period prior to the
Effective Time, to all its properties, books, contracts, commitments and records
and, during such period, MCI shall (and shall cause its Subsidiaries to) furnish
promptly to WorldCom (a) a copy of each report, schedule, registration statement
and other  document  filed,  published,  announced or received by it during such
period  pursuant to the  requirements  of Federal or state  securities  laws, as
applicable (other than reports or documents which such party is not permitted to
disclose under applicable  law), and (b) consistent with its legal  obligations,
all other information concerning its business,  properties and personnel as such
other party may reasonably request; provided, however, that MCI may restrict the
foregoing  access to the extent that (i) a Governmental  Entity  requires MCI or
any of its  Subsidiaries  to restrict  access to any  properties or  information
reasonably  related to any such  contract  on the basis of  applicable  laws and
regulations  with respect to national  security matters or (ii) any law, treaty,
rule or regulation of any Governmental  Entity applicable to MCI requires MCI or
its  Subsidiaries  to restrict  access to any  properties  or  information.  The
parties will hold any such information  which is non-public in confidence to the
extent  required by, and in accordance  with, the provisions of the letter dated
October 16, 1997 between MCI and WorldCom (the "Confidentiality Agreement"). Any
investigation  by  WorldCom  or MCI shall not  affect  the  representations  and
warranties of MCI or WorldCom, as the case may be.



<PAGE>


                                       29



                  5.4 Best Efforts.  (a) Subject to the terms and  conditions of
this  Agreement,  each party will use its best  efforts to take,  or cause to be
taken, all actions and to do, or cause to be done, all things necessary,  proper
or advisable under  applicable laws and regulations to consummate the Merger and
the other  transactions  contemplated  by this  Agreement as soon as practicable
after the date hereof.  In  furtherance  and not in limitation of the foregoing,
each party hereto  agrees to make,  to the extent it has not already done so, an
appropriate  filing of a  Notification  and Report Form  pursuant to the HSR Act
with respect to the transactions  contemplated hereby as promptly as practicable
and in any event within five  business  days of the date hereof and to supply as
promptly as practicable any additional information and documentary material that
may be requested pursuant to the HSR Act and to take all other actions necessary
to cause the expiration or termination of the applicable  waiting  periods under
the HSR Act as soon as practicable.

                  (b) Each of WorldCom  and MCI shall,  in  connection  with the
efforts  referenced  in Section  5.4(a) to obtain all  requisite  approvals  and
authorizations for the transactions  contemplated by this Merger Agreement under
the HSR Act or any other Regulatory Law (as defined below), use its best efforts
to (i) cooperate in all respects  with each other in connection  with any filing
or  submission  and in  connection  with any  investigation  or  other  inquiry,
including any proceeding  initiated by a private party; (ii) promptly inform the
other party of any  communication  received by such party from, or given by such
party to, the FCC,  PUCs,  the Antitrust  Division of the  Department of Justice
(the "DOJ") or any other Governmental  Entity and of any material  communication
received or given in connection  with any proceeding by a private party, in each
case regarding any of the transactions contemplated hereby, and (iii) permit the
other party to review any  communication  given by it to, and consult  with each
other in advance of any meeting or conference  with,  the FCC,  PUCs, the DOJ or
any such other  Governmental  Entity or, in connection  with any proceeding by a
private party,  with any other Person,  and to the extent  permitted by the FCC,
PUCs, the DOJ or such other applicable Governmental Entity or other Person, give
the other party the  opportunity to attend and  participate in such meetings and
conferences. For purposes of this Agreement,  "Regulatory Law" means the Sherman
Act, as amended,  the Clayton Act, as amended,  the HSR Act,  the Federal  Trade
Commission Act, as amended, the Federal  Communications Act, as amended, and all
other federal, state and foreign, if any, statutes, rules, regulations,  orders,
decrees,  administrative and judicial doctrines and other laws that are designed
or intended to  prohibit,  restrict  or regulate  actions  having the purpose or
effect of  monopolization  or restraint  of trade or  lessening of  competition,
whether  in  the   communications   industry  or  otherwise  through  merger  or
acquisition.



<PAGE>


                                       30



                  (c) In  furtherance  and not in limitation of the covenants of
the parties  contained in Sections 5.4(a) and 5.4(b),  if any  administrative or
judicial  action or proceeding,  including any proceeding by a private party, is
instituted  (or  threatened  to  be  instituted)   challenging  any  transaction
contemplated  by this  Agreement  as violative of any  Regulatory  Law,  each of
WorldCom and MCI shall  cooperate  in all  respects  with each other and use its
respective  best efforts to contest and resist any such action or proceeding and
to have vacated, lifted, reversed or overturned any decree, judgment, injunction
or other order, whether temporary,  preliminary or permanent,  that is in effect
and that  prohibits,  prevents or  restricts  consummation  of the  transactions
contemplated  by this  Agreement.  Notwithstanding  the  foregoing  or any other
provision of this  Agreement,  nothing in this Section 5.4 shall limit a party's
right to terminate this  Agreement  pursuant to Section 7.1(b) or 7.1(c) so long
as such party has up to then complied in all respects with its obligations under
this Section 5.4.

                  (d)  If  any  objections  are  asserted  with  respect  to the
transactions  contemplated  hereby  under any  Regulatory  Law or if any suit is
instituted by any  Governmental  Entity or any private party  challenging any of
the transactions contemplated hereby as violative of any Regulatory Law, each of
WorldCom  and MCI shall use its best efforts to resolve any such  objections  or
challenge  as  such  Governmental  Entity  or  private  party  may  have to such
transactions  under  such  Regulatory  Law so as to permit  consummation  of the
transactions contemplated by this Agreement.

                  (e) Each of  WorldCom,  Merger  Sub and MCI shall use its best
efforts  to cause the  Merger to  qualify  and will not (both  before  and after
consummation  of the  Merger)  take any  actions  which to its  knowledge  could
reasonably   be  expected  to  prevent   the  Merger  from   qualifying,   as  a
reorganization under the provisions of Section 368 of the Code.

                  5.5  Acquisition  Proposals.  Each of WorldCom  and MCI agrees
that  neither  it nor  any of  its  Subsidiaries  nor  any of the  officers  and
directors of it or its Subsidiaries  shall, and that it shall direct and use its
best  efforts  to  cause  its  and  its  Subsidiaries'  employees,   agents  and
representatives   (including  any  investment  banker,  attorney  or  accountant
retained  by it or any of its  Subsidiaries)  not to,  directly  or  indirectly,
initiate,  solicit,  encourage  or  otherwise  facilitate  (including  by way of
furnishing  information)  any  inquiries  or the making of any proposal or offer
with  respect  to  a  merger,  reorganization,  share  exchange,  consolidation,
business  combination,  recapitalization,  liquidation,  dissolution  or similar
transaction involving, or any purchase or sale of all or any significant portion
of the  assets  or 10% or more of the  equity  securities  of,  it or any of its
Subsidiaries  that, in any such case,  could reasonably be expected to interfere
with the completion of the Merger or the other transactions contemplated by this
Agreement


<PAGE>


                                       31



(any such  proposal or offer being  hereinafter  referred to as an  "Acquisition
Proposal").  Each of WorldCom and MCI further  agrees that neither it nor any of
its Subsidiaries nor any of the officers and directors of it or its Subsidiaries
shall,  and that it shall  direct and use its best  efforts to cause its and its
Subsidiaries'  employees,  agents and representatives  (including any investment
banker,  attorney or accountant  retained by it or any of its  Subsidiaries) not
to, directly or indirectly, have any discussion with or provide any confidential
information or data to any Person relating to an Acquisition Proposal, or engage
in any negotiations  concerning an Acquisition Proposal, or otherwise facilitate
any effort or attempt to make or implement an Acquisition  Proposal or accept an
Acquisition  Proposal.  Notwithstanding  the  foregoing,  MCI  or its  Board  of
Directors shall be permitted to (A) to the extent  applicable,  comply with Rule
14e-2(a)  promulgated  under the  Exchange  Act with  regard  to an  Acquisition
Proposal,  (B) in  response  to an  unsolicited  bona fide  written  Acquisition
Proposal  by any  Person,  recommend  such  an  unsolicited  bona  fide  written
Acquisition  Proposal to the  stockholders  of MCI, or withdraw or modify in any
adverse manner its approval or recommendation of this Agreement or (C) engage in
any discussions or negotiations  with, or provide any information to, any Person
in response to an unsolicited bona fide written Acquisition Proposal by any such
Person,  if and only to the extent  that,  in any such case as is referred to in
clause (B) or (C), (i) the MCI  Stockholders  Meeting  shall not have  occurred,
(ii) the Board of Directors of MCI concludes in good faith that such Acquisition
Proposal (x) in the case of clause (B) above would, if consummated, constitute a
Superior  Proposal  or (y) in the case of clause (C) above could  reasonably  be
expected  to  constitute  a Superior  Proposal,  (iii)  prior to  providing  any
information or data to any Person in connection with an Acquisition  Proposal by
any such  Person,  the MCI  Board of  Directors  receives  from  such  Person an
executed  confidentiality  agreement  on terms  substantially  similar  to those
contained  in the  Confidentiality  Agreement  and (iv) prior to  providing  any
information or data to any Person or entering into  discussions or  negotiations
with any Person, the Board of Directors of MCI notifies WorldCom  immediately of
such inquiries,  proposals or offers received by, any such information requested
from,  or any  such  discussions  or  negotiations  sought  to be  initiated  or
continued with, any of its representatives  indicating,  in connection with such
notice,  the name of such Person and the material  terms and  conditions  of any
proposals  or  offers.  MCI agrees  that it will keep  WorldCom  informed,  on a
current  basis,  of the status and terms of any such proposals or offers and the
status of any such discussions or negotiations.  Each of WorldCom and MCI agrees
that  it  will  immediately  cease  and  cause  to be  terminated  any  existing
activities,  discussions or negotiations with any parties  conducted  heretofore
with respect to any Acquisition  Proposal.  Each of WorldCom and MCI agrees that
it will take the necessary  steps to promptly inform the individuals or entities
referred to in the first sentence of this Section 5.5


<PAGE>


                                       32



of the obligations  undertaken in this Section 5.5.  Nothing in this Section 5.5
shall (x) permit either  WorldCom or MCI to terminate this Agreement  (except as
specifically  provided in Article VII hereof) or (y) affect any other obligation
of MCI or WorldCom under this Agreement.

                  5.6  [Intentionally Omitted]

                  5.7 Stock  Options and Other Stock  Plans;  Employee  Benefits
Matters.  MCI and WorldCom will agree to provisions  with respect to MCI's stock
options and other stock plans and  treatment of MCI's  officers and employees as
set forth in Exhibit 5.7 hereto.

                  5.8  Fees  and   Expenses.   Whether  or  not  the  Merger  is
consummated,  all Expenses  incurred in connection  with this  Agreement and the
transactions  contemplated  hereby  shall be paid by the  party  incurring  such
Expenses,  except (a) if the Merger is  consummated,  the Surviving  Corporation
shall pay, or cause to be paid,  any and all property or transfer  taxes imposed
on MCI or its  Subsidiaries  and any real  property  transfer tax imposed on any
holder of shares of capital stock of MCI resulting from the Merger, (b) Expenses
incurred in connection with the filing,  printing and mailing of the Joint Proxy
Statement/Prospectus,  which shall be shared equally by WorldCom and MCI and (c)
as provided in Section 7.2. As used in this Agreement,  "Expenses"  includes all
out-of-pocket expenses (including,  without limitation, all fees and expenses of
counsel,  accountants,  investment  bankers,  experts and consultants to a party
hereto and its  affiliates)  incurred by a party or on its behalf in  connection
with or related to the authorization,  preparation,  negotiation,  execution and
performance  of  this  Agreement  and  the  transactions   contemplated  hereby,
including  the  preparation,  printing,  filing and  mailing of the Joint  Proxy
Statement/Prospectus and the solicitation of stockholder approvals and all other
matters related to the transactions contemplated hereby.

                  5.9   Directors'  and  Officers'   Insurance.   The  Surviving
Corporation  shall  cause to be  maintained  in  effect  in its  certificate  of
incorporation  and  by-laws  (i) for a period of six years  after the  Effective
Time, the current provisions regarding elimination of liability of directors and
indemnification   of  officers,   directors  and  employees   contained  in  the
certificate  of  incorporation  and  by-laws of MCI and (ii) for a period of six
years, the current policies of directors' and officers'  liability insurance and
fiduciary  liability  insurance  maintained by MCI (provided  that the Surviving
Corporation may substitute  therefor  policies of at least the same coverage and
amounts  containing  terms and conditions  which are, in the aggregate,  no less
advantageous to the insured) with respect to claims arising from facts or events
that occurred on or before the Effective  Time;  provided,  however,  that in no
event shall the Surviving


<PAGE>


                                       33



Corporation be required to expend in any one year an amount in excess of 200% of
the annual  premiums  currently paid by MCI for such insurance;  and,  provided,
further,  that if the annual  premiums of such  insurance  coverage  exceed such
amount, the Surviving Corporation shall be obligated to obtain a policy with the
greatest coverage available for a cost not exceeding such amount.

                  5.10 Rights  Agreement.  The Board of  Directors  of MCI shall
take all  further  action (in  addition to that  referred to in Section  3.1(g))
necessary  (including  redeeming the Rights  immediately  prior to the Effective
Time  or  amending  the  Rights   Agreement)  in  order  to  render  the  Rights
inapplicable  to the  Merger  and the other  transactions  contemplated  by this
Agreement.

                  5.11  Public  Announcements.  MCI and  WorldCom  shall use all
reasonable efforts to develop a joint  communications  plan and each party shall
use all  reasonable  efforts  (i) to ensure  that all press  releases  and other
public statements with respect to the transactions  contemplated hereby shall be
consistent  with such  joint  communications  plan,  and (ii)  unless  otherwise
required by applicable law or by obligations  pursuant to any listing  agreement
with or rules of any  securities  exchange,  to consult  with each other  before
issuing any press release or otherwise  making any public statement with respect
to this Agreement or the transactions contemplated hereby.

                  5.12  Accountants'  Letters.  Upon reasonable  notice from the
other,  MCI and WorldCom shall use their  respective  reasonable best efforts to
cause Price Waterhouse LLP and Arthur Andersen LLP, respectively,  to deliver to
WorldCom or MCI, as the case may be, a letter, dated within two business days of
the  Effective  Time of the Form S-4 covering  such matters as are  requested by
WorldCom  or MCI,  as the  case  may be,  and as are  customarily  addressed  in
accountant's  "comfort" letters. In connection with WorldCom's efforts to obtain
such  letter,  if  requested  by  Arthur  Andersen  LLP,  MCI  shall  provide  a
representation  letter to Arthur  Andersen LLP  complying  with the statement on
Auditing Standards No. 72 ("SAS 72"), if then required. In connection with MCI's
efforts to obtain such letter,  if requested by Price  Waterhouse LLP,  WorldCom
shall provide a representation letter to Price Waterhouse LLP complying with SAS
72, if then required.

                  5.13  Listing of Shares of  WorldCom  Common  Stock.  WorldCom
shall use its best  efforts to cause the shares of WorldCom  Common  Stock to be
issued in the Merger to be  approved  for  quotation,  upon  official  notice of
issuance, on NASDAQ.

                  5.14  Voting   Trust.   If  at  any  time  prior  to  the  MCI
Stockholders  Meeting a third party shall make an unsolicited tender or exchange
offer to acquire  control of MCI, which offer is not  recommended by MCI's Board
of Directors, then WorldCom and


<PAGE>


                                       34



MCI will use their  reasonable  best  efforts  to  consummate  the  transactions
contemplated  hereby by  implementing  a "voting  trust"  or  similar  structure
permitting  consummation of the  transactions  contemplated  hereby prior to the
receipt of final FCC and PUC approvals.


                                   ARTICLE VI

                              CONDITIONS PRECEDENT

                  6.1  Conditions  to Each  Party's  Obligation  to  Effect  the
Merger. The obligations of MCI, WorldCom and Merger Sub to effect the Merger are
subject to the  satisfaction  or waiver on or prior to the  Closing  Date of the
following conditions:

                  (a)  Stockholder  Approval.  (i) MCI shall have  obtained  the
Required  MCI Votes in  connection  with the  adoption of this  Agreement by the
stockholders of MCI and (ii) WorldCom shall have obtained the Required  WorldCom
Vote in connection  with the approval of the Share Issuance by the  stockholders
of WorldCom.

                  (b) No Injunctions or  Restraints,  Illegality.  No Laws shall
have  been  adopted  or  promulgated,   and  no  temporary   restraining  order,
preliminary  or permanent  injunction  or other order issued by a court or other
Governmental  Entity of competent  jurisdiction  shall be in effect,  having the
effect of making the Merger illegal or otherwise prohibiting consummation of the
Merger; provided,  however, that the provisions of this Section 6.1(b) shall not
be available to any party whose failure to fulfill its  obligations  pursuant to
Section 5.4 shall have been the cause of, or shall have  resulted in, such order
or injunction.

                  (c) FCC and Public Utility Commission Approvals. All approvals
for the Merger  from the FCC and from the PUCs shall  have been  obtained  other
than those the failure of which to be obtained  would not reasonably be expected
to have  individually or in the aggregate a Material  Adverse Effect on WorldCom
and its Subsidiaries (including the Surviving Corporation).

                  (d) HSR Act. The waiting  period (and any  extension  thereof)
applicable  to the Merger under the HSR Act shall have been  terminated or shall
have expired.

                  (e) EU  Antitrust.  WorldCom  and MCI shall have  received  in
respect of the Merger and any matters arising therefrom:  confirmation by way of
a decision from the  Commission of the European Union under  Regulation  4064.89
(with or without the initiation of proceedings  under Article  6(1)(c)  thereof)
that the Merger and any matters arising therefrom are compatible with the common
market.



<PAGE>


                                       35



                  (f) NASDAQ Listing.  The shares of WorldCom Common Stock to be
issued in the Merger shall have been approved  upon official  notice of issuance
for quotation on NASDAQ.

                  (g)  Effectiveness  of the Form S-4.  The Form S-4 shall  have
been  declared  effective  by the SEC under the  Securities  Act.  No stop order
suspending the  effectiveness  of the Form S-4 shall have been issued by the SEC
and no  proceedings  for that purpose shall have been initiated or threatened by
the SEC.

                  6.2  Additional  Conditions  to  Obligations  of WorldCom  and
Merger Sub. The  obligations of WorldCom and Merger Sub to effect the Merger are
subject  to the  satisfaction  of,  or waiver  by  WorldCom,  on or prior to the
Closing Date of the following conditions:

                  (a)    Representations    and   Warranties.    Each   of   the
representations  and  warranties  of MCI set  forth  in this  Agreement  that is
qualified as to materiality shall have been true and correct on the date of this
Agreement,  and each of the representations and warranties of MCI that is not so
qualified shall have been true and correct in all material  respects on the date
of this  Agreement,  and WorldCom shall have received a certificate of the chief
executive officer and the chief financial officer of MCI to such effect.

                  (b)   Performance  of  Obligations  of  MCI.  MCI  shall  have
performed or complied with all agreements and covenants required to be performed
by it under this Agreement at or prior to the Closing Date that are qualified as
to  materiality  and shall have  performed or complied in all material  respects
with all other  agreements  and  covenants  required to be performed by it under
this  Agreement  at or prior to the Closing Date that are not so qualified as to
materiality,  and  WorldCom  shall  have  received  a  certificate  of the chief
executive officer and the chief financial officer of MCI to such effect.

                  (c) Tax Opinion.  WorldCom  shall have  received from Cravath,
Swaine & Moore,  counsel to WorldCom,  on the Closing  Date,  a written  opinion
dated  as of such  date  substantially  in the  form of  Exhibit  6.2(c)(1).  In
rendering  such  opinion,  counsel to  WorldCom  shall be  entitled to rely upon
representations  of officers of WorldCom  and MCI  substantially  in the form of
Exhibits 6.2(c)(3) and 6.2(c)(4).

                  6.3   Additional   Conditions  to   Obligations  of  MCI.  The
obligations of MCI to effect the Merger are subject to the  satisfaction  of, or
waiver  by MCI,  on or prior to the  Closing  Date of the  following  additional
conditions:

                  (a)    Representations    and   Warranties.    Each   of   the
representations  and  warranties  of  WorldCom  and Merger Sub set forth in this
Agreement that is qualified as to materiality shall


<PAGE>


                                       36



have  been  true  and  correct  on the date of this  Agreement,  and each of the
representations and warranties of each of WorldCom and Merger Sub that is not so
qualified shall have been true and correct in all material  respects on the date
of this  Agreement,  and MCI shall  have  received  a  certificate  of the chief
executive officer and the chief financial officer of WorldCom to such effect.

                  (b)  Performance of  Obligations  of WorldCom.  WorldCom shall
have  performed or complied with all  agreements  and  covenants  required to be
performed  by it under this  Agreement  at or prior to the Closing Date that are
qualified as to materiality and shall have performed or complied in all material
respects with all agreements and covenants  required to be performed by it under
this  Agreement  at or prior to the Closing Date that are not so qualified as to
materiality,  and MCI shall have received a certificate  of the chief  executive
officer and the chief financial officer of WorldCom to such effect.

                  (c) Tax Opinion.  MCI shall have received from Simpson Thacher
& Bartlett,  counsel to MCI, on the Closing Date, a written  opinion dated as of
such date  substantially  in the form of Exhibit  6.2(c)(2).  In rendering  such
opinion,  counsel  to MCI  shall be  entitled  to rely upon  representations  of
officers of WorldCom and MCI substantially in the form of Exhibits 6.2(c)(3) and
6.2(c)(4).

                  (d) No  Material  Adverse  Change.  Since  the  date  of  this
Agreement,  WorldCom and its  Subsidiaries  shall not have incurred any material
liability,  except in the  ordinary  course  of  business  consistent  with past
practice,  nor shall there have been any adverse change,  circumstance or effect
that,  individually  or  in  the  aggregate  with  all  other  adverse  changes,
circumstances and effects,  is or is reasonably likely to be materially  adverse
to the  business,  financial  condition or results of operations of WorldCom and
its Subsidiaries taken as a whole, other than any change, circumstance or effect
relating  to (i) the  economy  or  securities  markets  in  general  or (ii) the
industries  in which  WorldCom or MCI operate and not  specifically  relating to
WorldCom or MCI.


                                   ARTICLE VII

                            TERMINATION AND AMENDMENT

                  7.1 Termination.  This Agreement may be terminated at any time
prior to the  Effective  Time,  by action  taken or  authorized  by the Board of
Directors of the  terminating  party or parties,  and except as provided  below,
whether before or after approval of the matters presented in connection with the
Merger by the stockholders of MCI or WorldCom:



<PAGE>


                                       37



                  (a) By mutual  written  consent of WorldCom and MCI, by action
of their respective Boards of Directors;

                  (b) By either MCI or WorldCom if the Effective  Time shall not
have occurred on or before December 31, 1998 (the "Termination Date"); provided,
however,  that the right to terminate this  Agreement  under this Section 7.1(b)
shall not be  available  to any party whose  failure to fulfill  any  obligation
under this  Agreement  (including  without  limitation  Section  5.4) has to any
extent been the cause of, or resulted in, the failure of the  Effective  Time to
occur on or before the Termination Date;

                  (c) By either MCI or WorldCom if (x) any  Governmental  Entity
(i)  shall  have  issued an  order,  decree or ruling or taken any other  action
(which the  parties  shall have used  their best  efforts to resist,  resolve or
lift, as applicable,  in accordance with Section 5.4)  permanently  restraining,
enjoining  or  otherwise  prohibiting  the  transactions  contemplated  by  this
Agreement,  and such order,  decree,  ruling or other  action  shall have become
final and  nonappealable or (ii) shall have failed to issue an order,  decree or
ruling or to take any other action (which order, decree,  ruling or other action
the parties  shall have used their best efforts to obtain,  in  accordance  with
Section  5.4),  in each case (i) and (ii)  which is  necessary  to  fulfill  the
conditions set forth in subsections 6.1(c), (d) and (e), as applicable, and such
denial of a request  to issue  such  order,  decree,  ruling or take such  other
action shall have become final and nonappealable;  provided,  however,  that the
right to  terminate  this  Agreement  under  this  Section  7.1(c)  shall not be
available  to any party  whose  failure to comply  with  Section  5.4 has to any
extent been the cause of such action or inaction;

                  (d)  By  either  MCI  or  WorldCom  if  the  approval  by  the
stockholders of MCI or of WorldCom  required for the  consummation of the Merger
shall not have been obtained by reason of the failure to obtain the Required MCI
Votes or the Required  WorldCom Vote, as the case may be, at a duly held meeting
of  stockholders  of MCI or WorldCom,  as the case may be, or at any adjournment
thereof;

                  (e) By WorldCom if the Board of Directors of MCI, prior to the
MCI Stockholders  Meeting (i) shall withdraw or modify in any adverse manner its
approval or recommendation of this Agreement pursuant to Section 5.5, (ii) shall
approve or recommend a Superior  Proposal pursuant to Section 5.5 or (iii) shall
resolve to take any of the actions specified in clauses (i) or (ii) above; or

                  (f) By MCI at any time prior to the MCI Stockholders  Meeting,
upon two Business  Days' prior notice to WorldCom,  if the Board of Directors of
MCI shall approve a Superior  Proposal;  provided,  however,  that (i) MCI shall
have  complied  with Section 5.5,  (ii) the Board of Directors of MCI shall have
concluded in


<PAGE>


                                       38



good  faith,  after  giving  effect to all  concessions  which may be offered by
WorldCom  pursuant  to clause  (iii)  below,  on the basis of the  advice of its
financial  advisors  and  outside  counsel,  that such  proposal  is a  Superior
Proposal and (iii) prior to any such termination, MCI shall, and shall cause its
financial  and  legal  advisors  to,   negotiate  with  WorldCom  to  make  such
adjustments  in the terms  and  conditions  of this  Agreement  as would  enable
WorldCom  to  proceed  with  the  transactions  contemplated  hereby;  provided,
however,  that it shall be a condition  to  termination  by MCI pursuant to this
Section 7.l(f) that MCI shall have made the payment of the WorldCom  Alternative
Transaction Fee to WorldCom required by Section 7.2(b).

                  Notwithstanding anything else contained in this Agreement, the
right to terminate this Agreement  under this Section 7.1 shall not be available
to any party (a) that is in material breach of its obligations  hereunder or (b)
whose failure to fulfill its  obligations or to comply with its covenants  under
this Agreement has been the cause of, or resulted in, the failure to satisfy any
condition to the obligations of either party hereunder.

                  7.2 Effect of Termination.  (a) In the event of termination of
this  Agreement  by either MCI or  WorldCom as  provided  in Section  7.1,  this
Agreement  shall  forthwith  become  void and  there  shall be no  liability  or
obligation  on the part of  WorldCom  or MCI or  their  respective  officers  or
directors except with respect to Section 3.1(h), Section 3.2(h), Section 4.1(k),
the second  sentence of Section 5.3,  Section 5.8,  this Section 7.2 and Article
VIII.

                  (b)  WorldCom  and MCI agree  that (i) if MCI shall  terminate
this  Agreement  pursuant to Section 7.1(f) or (ii) if (x) MCI or WorldCom shall
terminate this Agreement  pursuant to Section 7.1(d) due to the failure of MCI's
stockholders  to approve and adopt this  Agreement or WorldCom  shall  terminate
this Agreement  pursuant to Section 7.1(e),  (y) at the time of the event giving
rise to such termination there shall exist an Acquisition  Proposal with respect
to MCI and (z) within 12 months of the termination of this Agreement, MCI enters
into a definitive  agreement with any third party with respect to an Acquisition
Proposal  or an  Acquisition  Proposal  is  consummated,  then MCI  shall pay to
WorldCom an amount equal to $750 million (the "WorldCom Alternative  Transaction
Fee") and shall reimburse  WorldCom for the amount of the BT Inducement Fee paid
to BT (such amount, the "Reimbursement Amount").

                  (c)  The  WorldCom   Alternative   Transaction   Fee  and  the
Reimbursement  Amount required to be paid pursuant to Section 7.2(b)(i) shall be
made prior to, and shall be a pre-condition to the  effectiveness of termination
of this  Agreement  pursuant to such Section.  Any other payment  required to be
made pursuant to Section 7.2(b) shall be made to WorldCom not later than two


<PAGE>


                                       39



Business Days after the entering into of a definitive agreement with respect to,
or the consummation  of, an Acquisition  Proposal,  as applicable.  All payments
under this Section 7.2 and under  Section 7.3 shall be made by wire  transfer of
immediately  available  funds to an account  designated by the party entitled to
receive payment.

                  7.3 Payment by  WorldCom.  WorldCom  and MCI agree that if (a)
this Agreement shall be terminated pursuant to (i) Section 7.1(b) and any of the
conditions to the Merger set forth in Section 6.1(b),  6.1(c),  6.1(d),  6.1(e),
6.3(a),  6.3(b) or 6.3(d) has not been satisfied,  (ii) Section 7.1(c), or (iii)
Section  7.1(d)  solely  as a result  of the  Required  WorldCom  Vote not being
obtained at a duly called WorldCom  Stockholders  Meeting or (b) notwithstanding
the satisfaction of all the conditions set forth in Sections 6.1 and 6.2 and the
satisfaction  or waiver by MCI of all the  conditions  set forth in Section 6.3,
WorldCom is not willing to consummate the Merger, then, unless (1) MCI shall not
have   complied   with   Section  5.4  or  (2)  MCI  shall  have   breached  its
representations or warranties or its agreements or covenants hereunder such that
either of the conditions to the Merger set forth in Section 6.2(a) or 6.2(b) has
not been satisfied,  WorldCom shall pay to MCI an amount in cash equal to $1.635
billion.  The payment  required to be made pursuant to this Section 7.3 shall be
made not later than two Business Days after the date of such termination or such
willful failure of WorldCom to close. Notwithstanding anything in this Agreement
(including Section 8.10) to the contrary,  the payment of any amount pursuant to
this  Section  7.3 (other  than  pursuant  to Section  7.3(a)(i),  if due to the
failure  of the  conditions  set forth in Section  6.3(a) or 6.3(b),  or Section
7.3(b)) shall constitute  liquidated  damages in full and complete  satisfaction
of, and shall be MCI's  sole and  exclusive  remedy  for,  any loss,  liability,
damage or claim arising out of or in  connection  with any such  termination  of
this Agreement or the facts and  circumstances  resulting in such termination or
otherwise related thereto or otherwise arising out of or in connection with this
Agreement.

                  7.4  Amendment.  This  Agreement may be amended by the parties
hereto,  by action taken or authorized by their respective  Boards of Directors,
at any time before or after approval of the matters presented in connection with
the  Merger  by the  stockholders  of MCI and  WorldCom,  but,  after  any  such
approval,  no  amendment  shall be made which by law or in  accordance  with the
rules  of  any  relevant  stock  exchange  requires  further  approval  by  such
stockholders  without such further  approval.  This Agreement may not be amended
except by an  instrument  in  writing  signed  on behalf of each of the  parties
hereto.

                  7.5  Extension;  Waiver.  At any time  prior to the  Effective
Time,  the parties  hereto,  by action taken or authorized  by their  respective
Boards of Directors, may, to the extent legally allowed, (i) extend the time for
the performance of any


<PAGE>


                                       40



of the  obligations  or other acts of the other parties  hereto,  (ii) waive any
inaccuracies in the  representations  and warranties  contained herein or in any
document  delivered  pursuant hereto and (iii) waive  compliance with any of the
agreements or conditions  contained herein. Any agreement on the part of a party
hereto to any such  extension  or waiver  shall be valid  only if set forth in a
written  instrument  signed on behalf of such party. The failure of any party to
this  Agreement  to assert any of its rights  under this  Agreement or otherwise
shall not constitute a waiver of those rights.

                                  ARTICLE VIII

                               GENERAL PROVISIONS

                  8.1   Non-Survival   of   Representations,    Warranties   and
Agreements.  None  of  the  representations,  warranties,  covenants  and  other
agreements in this  Agreement or in any  instrument  delivered  pursuant to this
Agreement,   including   any   rights   arising   out  of  any  breach  of  such
representations,  warranties,  covenants and other agreements, shall survive the
Effective Time,  except for those covenants and agreements  contained herein and
therein  that by their  terms apply or are to be  performed  in whole or in part
after the  Effective  Time and this  Article  VIII.  Nothing in this Section 8.1
shall relieve any party for any breach of any representation, warranty, covenant
or other agreement in this Agreement occurring prior to termination.

                  8.2 Notices.  All notices and other  communications  hereunder
shall be in writing  and shall be deemed  duly given (a) on the date of delivery
if delivered personally,  or by telecopy or telefacsimile,  upon confirmation of
receipt,  (b) on the  first  Business  Day  following  the date of  dispatch  if
delivered by a recognized next-day courier service, or (c) on the tenth Business
Day following the date of mailing if delivered by registered or certified  mail,
return  receipt  requested,  postage  prepaid.  All notices  hereunder  shall be
delivered as set forth below,  or pursuant to such other  instructions as may be
designated in writing by the party to receive such notice:

                  (a)      if to WorldCom or Merger Sub, to

WorldCom, Inc.
10777 Sunset Office Drive
Suite 330
St. Louis, MO  63127
Attention: P. Bruce Borghardt, Esq.
         General Counsel
         Corporate Development
Facsimile No.:  314-909-4101



<PAGE>


                                       41



with a copy to

Cravath, Swaine & Moore
Worldwide Plaza
825 Eighth Avenue
New York, New York  10019
Attention:  Allen Finkelson, Esq.
         Robert A. Kindler, Esq.
Facsimile No.: 212-474-3700

(b) if to MCI to

MCI Communications Corporation
1801 Pennsylvania Avenue, NW
Washington, D.C.  20006
Attention: Michael Salsbury, Esq.
           Executive Vice President
             and General Counsel
Facsimile No.: 202-887-3353

with a copy to

Simpson Thacher & Bartlett
425 Lexington Avenue
New York, New York  10017
Attention:  Richard I. Beattie, Esq.
         Philip T. Ruegger III, Esq.
Facsimile No.: 212-455-2502

                  8.3 Interpretation. When a reference is made in this Agreement
to Sections,  Exhibits or Schedules,  such reference shall be to a Section of or
Exhibit or Schedule to this Agreement unless otherwise  indicated.  The table of
contents, glossary of defined terms and headings contained in this Agreement are
for  reference  purposes  only and shall not  affect in any way the  meaning  or
interpretation  of this Agreement.  Whenever the words "include",  "includes" or
"including" are used in this  Agreement,  they shall be deemed to be followed by
the words "without limitation".

                  8.4  Counterparts.  This  Agreement  may be executed in one or
more  counterparts,  all of which shall be considered one and the same agreement
and shall become  effective  when one or more  counterparts  have been signed by
each of the parties and delivered to the other party,  it being  understood that
both parties need not sign the same counterpart.

                  8.5 Entire Agreement;  No Third Party Beneficiaries.  (a) This
Agreement and the BT Agreement (and the agreement referred to in Section 5.2(c))
constitute  the  entire   agreement  and  supersede  all  prior  agreements  and
understandings,  both  written and oral,  among the parties  with respect to the
subject


<PAGE>


                                       42



matter hereof, other than the Confidentiality Agreement, which shall survive the
execution and delivery of this Agreement.

                  (b) This  Agreement  shall be binding upon and inure solely to
the  benefit of each party  hereto,  and nothing in this  Agreement,  express or
implied, is intended to or shall confer upon any other Person any right, benefit
or remedy of any nature  whatsoever under or by reason of this Agreement,  other
than Section 5.9 (which is intended to be for the benefit of the Persons covered
thereby and may be enforced by such Persons).

                  8.6  Governing  Law.  This  Agreement  shall be  governed  and
construed in accordance with the laws of the State of Delaware.

                  8.7  Severability.  If any  term or  other  provision  of this
Agreement  is  invalid,  illegal or  incapable  of being  enforced by any law or
public  policy,   all  other  terms  and  provisions  of  this  Agreement  shall
nevertheless  remain in full force and effect so long as the  economic  or legal
substance of the transactions  contemplated hereby is not affected in any manner
materially  adverse to any party. Upon such determination that any term or other
provision is invalid, illegal or incapable of being enforced, the parties hereto
shall  negotiate  in good  faith to modify  this  Agreement  so as to effect the
original intent of the parties as closely as possible in an acceptable manner in
order that the  transactions  contemplated  hereby are consummated as originally
contemplated to the greatest extent possible.

                  8.8 Assignment.  Neither this Agreement nor any of the rights,
interests  or  obligations  hereunder  shall be  assigned  by any of the parties
hereto, in whole or in part (whether by operation of law or otherwise),  without
the prior written  consent of the other party,  and any attempt to make any such
assignment  without such consent shall be null and void,  except that Merger Sub
may assign,  in its sole  discretion,  any or all of its rights,  interests  and
obligations  under this  Agreement  to any direct  wholly  owned  Subsidiary  of
WorldCom without the consent of MCI, but no such assignment shall relieve Merger
Sub of any of its  obligations  under this  Agreement.  Subject to the preceding
sentence,  this Agreement  will be binding upon,  inure to the benefit of and be
enforceable by the parties and their respective successors and assigns.

                  8.9 Submission to Jurisdiction;  Waivers. Each of WorldCom and
MCI irrevocably  agrees that any legal action or proceeding with respect to this
Agreement or for  recognition  and enforcement of any judgment in respect hereof
brought by the other party  hereto or its  successors  or assigns may be brought
and  determined  in the Chancery or other  Courts of the State of Delaware,  and
each of  WorldCom  and MCI hereby  irrevocably  submits  with regard to any such
action or proceeding  for itself and in respect to its  property,  generally and
unconditionally, to the


<PAGE>


                                       43



nonexclusive  jurisdiction  of the  aforesaid  courts.  Each of WorldCom and MCI
hereby  irrevocably  waives,  and agrees not to assert,  by way of motion,  as a
defense,  counterclaim or otherwise, in any action or proceeding with respect to
this Agreement,  (a) the defense of sovereign immunity, (b) any claim that it is
not personally  subject to the  jurisdiction of the  above-named  courts for any
reason other than the failure to serve process in  accordance  with this Section
8.9,  (c) that it or its property is exempt or immune from  jurisdiction  of any
such court or from any legal process  commenced in such courts (whether  through
service of notice, attachment prior to judgment,  attachment in aid of execution
of judgment,  execution of judgment or otherwise), and (d) to the fullest extent
permitted by applicable law, that (i) the suit, action or proceeding in any such
court is brought in an inconvenient  forum,  (ii) the venue of such suit, action
or  proceeding  is improper  and (iii) this  Agreement,  or the  subject  matter
hereof, may not be enforced in or by such courts.

                  8.10  Enforcement.  The parties agree that irreparable  damage
would occur in the event that any of the  provisions of this  Agreement were not
performed in accordance with their specific terms. It is accordingly agreed that
the parties shall be entitled to specific  performance of the terms hereof, this
being in  addition to any other  remedy to which they are  entitled at law or in
equity.

                  8.11 Definitions. As used in this Agreement:

                  (a) "Board of  Directors"  means the Board of Directors of any
specified Person and any committees thereof.

                  (b)  "Business  Day"  means  any day on  which  banks  are not
required or authorized to close in the City of New York.

                  (c)  "Material  Adverse  Effect"  means,  with  respect to any
entity, any adverse change,  circumstance or effect that, individually or in the
aggregate with all other adverse changes,  circumstances  and effects,  is or is
reasonably likely to be materially adverse to the business,  financial condition
or results of operations of such entity and its  Subsidiaries  taken as a whole,
other than any  change,  circumstance  or effect  relating to (i) the economy or
securities  markets in general or (ii) the  industries in which  WorldCom or MCI
operate and not specifically relating to WorldCom or MCI.

                  (d) "the other party" means, with respect to MCI, WorldCom and
means, with respect to WorldCom, MCI.

                  (e)  "Person"  means  an  individual,   corporation,   limited
liability company, partnership, association, trust, unincorporated organization,
other entity or group (as defined in the Exchange Act).


<PAGE>


                                       44



                  (f) "Subsidiary" when used with respect to any party means any
corporation or other organization,  whether incorporated or unincorporated,  (i)
of which such party or any other  Subsidiary of such party is a general  partner
(excluding partnerships, the general partnership interests of which held by such
party or any  Subsidiary  of such  party do not have a  majority  of the  voting
interests in such  partnership) or (ii) at least a majority of the securities or
other  interests of which having by their terms ordinary voting power to elect 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 such party or by any one or more of its Subsidiaries,  or
by such party and one or more of its Subsidiaries.

                  (g) "Superior  Proposal" means a bona fide written Acquisition
Proposal  which the Board of  Directors  of MCI  concludes  in good faith (after
consultation with its financial advisors and legal counsel), taking into account
all legal,  financial,  regulatory  and other  aspects of the  proposal  and the
Person making the proposal,  (i) would, if consummated,  result in a transaction
that  is  more  favorable  to  MCI's   stockholders   (in  their  capacities  as
stockholders),   from  a  financial  point  of  view,   than  the   transactions
contemplated by this Agreement and (ii) is reasonably capable of being completed
(provided  that for purposes of this  definition the term  Acquisition  Proposal
shall have the  meaning  assigned  to such term in Section  5.5 except  that the
reference to "10%" in the definition of  "Acquisition  Proposal" shall be deemed
to be a reference to "50%" and  "Acquisition  Proposal"  shall only be deemed to
refer to a transaction  involving MCI, or with respect to assets  (including the
shares of any Subsidiary of MCI) of MCI and its Subsidiaries,  taken as a whole,
and not any of its Subsidiaries alone).

                  (h) "Benefit  Plans" means,  with respect to any Person,  each
employee benefit plan,  program,  arrangement and contract  (including,  without
limitation,  any  "employee  benefit  plan," as defined  in Section  3(3) of the
Employee  Retirement  Income Security Act of 1974, as amended  ("ERISA") and any
bonus,  deferred  compensation,  stock bonus, stock purchase,  restricted stock,
stock  option,  employment,  termination,  stay  agreement  or bonus,  change in
control and  severance  plan,  program,  arrangement  and  contract)  all of the
foregoing  in effect on the date of this  Agreement,  to which such  Person is a
party,  which is maintained or contributed to by such Person, or with respect to
which such Person could incur  material  liability  under Section 4069,  4201 or
4212(c) of ERISA.

                  8.12 Other  Agreements.  The parties  hereto  acknowledge  and
agree that,  except as  otherwise  expressly  set forth in this  Agreement,  the
rights and obligations of MCI and WorldCom under any other agreement between the
parties shall not be affected by any provision of this Agreement.


<PAGE>


                                       45
         


         IN WITNESS  WHEREOF,  WorldCom,  MCI and Merger  Sub have  caused  this
Agreement to be signed by their respective  officers  thereunto duly authorized,
all as of November 9, 1997.

WORLDCOM, INC.


By: /s/ Bernard J. Ebbers
   Name:  Bernard J. Ebbers
   Title:  President and Chief
Executive Officer


TC INVESTMENTS CORP.


By: /s/ Bernard J. Ebbers
   Name:  Bernard J. Ebbers
   Title:  President and Chief
           Executive Officer


MCI COMMUNICATIONS CORPORATION


By: /s/ Bert C. Roberts, Jr.
   Name:  Bert C. Roberts, Jr.
   Title:   Chairman



<PAGE>





                       Definition Location of Definition



                             GLOSSARY DEFINED TERMS


Definition                                              Location of Definition

Acquisition Proposal............................................. 5.5
Affiliate Agreement.............................................. 3.1(j)
Agreement........................................................ Preamble
Benefit Plans.................................................... 8.11(i)
Blue Sky Laws.................................................... 3.1(c)(iii)
Board of Directors............................................... 8.11(a)
BT............................................................... Recitals
BT Agreement..................................................... Recitals
BT Inducement Fee................................................ Recitals
BT Merger Agreement.............................................. Recitals
Business Day..................................................... 8.11(b)
Certificate...................................................... 1.8(b)
Class A Common Stock............................................. Recitals
Class A Common Stock Merger Consideration........................ 1.8(a)
Closing.......................................................... 1.2
Closing Date..................................................... 1.2
Code............................................................. Recitals
Communications Act............................................... 3.1(c)(iii)
Confidentiality Agreement........................................ 5.3
Delaware Certificate of Merger................................... 1.3
DGCL............................................................. 1.1
DOJ.............................................................. 5.4(b)
Effective Time................................................... 1.3
ERISA............................................................ 8.11(i)
ESPP ............................................................ 3.1(b)
Exchange Act..................................................... 3.1(c)(iii)
Exchange Agent................................................... 2.1
Exchange Fund.................................................... 2.1
Exchange Ratio................................................... 1.8(a)
Expenses......................................................... 5.8
Fairness Opinions ............................................... 3.1(i)
FCC.............................................................. 3.1(c)(iii)
Form S-4......................................................... 5.1(a)
Financial Advisors .............................................. 3.1(h)
Governmental Entity ............................................. 3.1(c)(iii)
HSR Act.......................................................... 3.1(c)(iii)
ISUs............................................................. 3.1(b)
Joint Proxy Statement/Prospectus................................. 5.1(a)
Material Adverse Effect.......................................... 8.11(c)
MCI.............................................................. Preamble
MCI Affiliate Letter ............................................ 3.1(j)
MCI Common Stock................................................. Recitals
MCI Disclosure Schedule.......................................... 3.1
MCI SEC Reports.................................................. 3.1(d)
MCI Stockholders Meeting......................................... 5.1(b)
MCI Stock Option Plans........................................... 3.1(b)(i)
MCI Voting Debt.................................................. 3.1(b)(ii)
Merger........................................................... Recitals
Merger Consideration............................................. 1.8(a)
Merger Sub....................................................... Preamble

                                        i

<PAGE>





Definition                                              Location of Definition



NASDAQ........................................................... 1.8(a)
Ordinary Common Stock............................................ Recitals
Ordinary Common Stock Merger Consideration....................... 1.8(a)
Person........................................................... 8.11(e)
PUCs............................................................. 3.1(c)(iii)
Purchase Rights.................................................. 3.2(b)
Regulation 4064/89............................................... 3.1(c)(iii)
Regulatory Law................................................... 5.4(b)
Reimbursement Amount............................................. 7.2(b)
Required WorldCom Vote........................................... 3.2(g)
Required Consents................................................ 3.1(c)(iii)
Required MCI Votes............................................... 3.l(f)
Rights........................................................... 3.1(b)(i)
Rights Agreement................................................. 3.1(b)(i)
Rule 145......................................................... 3.1(j)
SAS 72........................................................... 5.12
SEC.............................................................. 3.1(d)
Securities Act................................................... 3.1(c)(iii)
Subsidiary....................................................... 8.11(f)
Superior Proposal................................................ 8.11(g)
Surviving Corporation............................................ 1.1
Tax.............................................................. 8.11(h)(i)
Taxable ......................................................... 8.11(h)(i)
Taxes............................................................ 8.11(h)(i)
Tax Return ...................................................... 8.11(h)(ii)
Termination Date ................................................ 7.1(b)
the other party.................................................. 9.11(d)
U.S. GAAP........................................................ 3.1(d)
Violation........................................................ 3.1(c)(ii)
WorldCom......................................................... Preamble
WorldCom Affiliate Letter........................................ 3.2(i)
WorldCom Alternative Transaction Fee............................. 7.2(b)
WorldCom Common Stock............................................ Recitals
WorldCom Disclosure Schedule..................................... 3.2
WorldCom Rights Agreement........................................ 3.2(b)
WorldCom Series A Preferred Stock................................ 3.2(b)
WorldCom Series B Preferred Stock................................ 3.2(b)
WorldCom Stockholders Meeting.................................... 5.1(c)
WorldCom Voting Debt............................................. 3.2(b)(ii)
WorldCom SEC Reports............................................. 3.2 (d)


                                                       ii

<PAGE>



                                TABLE OF CONTENTS

                                    ARTICLE I

         THE MERGER.................................................. 2
         1.1  The Merger............................................. 2
         1.2  Closing................................................ 2
         1.3  Effective Time......................................... 2
         1.4  Effects of the Merger.................................. 2
         1.5  Certificate of Incorporation........................... 3
         1.6  By-Laws................................................ 3
         1.7  Officers and Directors of Surviving Corporation........ 3
         1.8  Effect on Capital Stock................................ 3

                                   ARTICLE II

          EXCHANGE OF CERTIFICATES................................... 4
         2.1 Exchange Fund........................................... 4
         2.2  Exchange Procedures.................................... 4
         2.3  Distributions with Respect to Unexchanged Shares....... 5
         2.4  No Further Ownership Rights in MCI Common Stock........ 5
         2.5  No Fractional Shares of WorldCom Common Stock.......... 5
         2.6  Termination of Exchange Fund........................... 6
         2.7  No Liability........................................... 6
         2.8  Investment of the Exchange Fund........................ 6
         2.9  Lost Certificates...................................... 6
         2.10  Withholding Rights.................................... 7
         2.11  Further Assurances.................................... 7
         2.12  Stock Transfer Books.................................. 7

                                   ARTICLE III

         REPRESENTATIONS AND WARRANTIES..............................  7
         3.1  Representations and Warranties of MCI..................  7
               (a)  Organization, Standing and Power.................  8
               (b)  Capital Structure................................  8
               (c)  Authority; No Conflicts..........................  9
               (d)  Reports and Financial Statements................. 10
               (e)  Information Supplied............................. 10
               (f)  Vote Required.................................... 11
               (g)  Rights Agreement................................. 11
               (h)  Brokers or Finders............................... 11
               (i)  Opinions of Financial Advisors................... 11
               (j)  Affiliate Letter................................. 12
         3.2  Representations and Warranties of WorldCom............. 12
               (a)  Organization, Standing and Power................. 12
               (b)  Capital Structure................................ 12
               (c)  Authority; No Conflicts.......................... 13
               (d)  Reports and Financial Statements................. 14
               (e)  Information Supplied............................. 14
               (f)  Absence of Certain Changes or Events............. 15
               (g)  Vote Required.................................... 15
               (h)  Brokers or Finders............................... 15
               (i)  Affiliate Letter................................. 15
         3.3  Representations and Warranties of WorldCom and Merger Sub.. 15
               (a)  Organization and Corporate Power................. 15
               (b)  Corporate Authorization.......................... 16
               (c)  Non-Contravention................................ 16
               (d)  No Business Activities........................... 16

                                   ARTICLE IV

         COVENANTS RELATING TO CONDUCT OF BUSINESS................... 16
         4.1  Covenants of MCI....................................... 16
               (a)  Ordinary Course.................................. 16
               (b)  Dividends; Changes in Share Capital.............. 17
               (c)  Issuance of Securities........................... 17
               (d)  Governing Documents.............................. 17
               (e)  No Acquisitions.................................. 17
               (f)  No Dispositions.................................. 18
               (g)  Indebtedness..................................... 18
               (h)  Tax-Free Qualification........................... 18
               (i)  Other Actions.................................... 18
               (j)  Accounting Methods; Income Tax Elections......... 18
               (k)  MCI Rights Agreement............................. 18
         4.2  Covenants of WorldCom.................................. 19
               (a)  Ordinary Course.................................. 19
               (b)  Dividends; Changes in Share Capital.............. 19
               (c)  Issuance of Securities........................... 19
               (d)  Governing Documents.............................. 20
               (e)  No Acquisitions.................................. 20
               (f)  No Dispositions.................................. 20
               (g)  Indebtedness..................................... 20
               (h)  Tax-Free Qualification........................... 21
               (i)  Other Actions.................................... 21
               (j)  Accounting Methods; Income Tax Elections......... 21
               (k)  Acquisition Proposals............................ 21
               (l)  WorldCom Rights Agreement........................ 21
         4.3  Advice of Changes; Governmental Filings................ 21
         4.4  Transition Planning.................................... 22
         4.5  Control of Other Party's Business...................... 22





<PAGE>



                                    ARTICLE V

         ADDITIONAL AGREEMENTS....................................... 22
         5.1  Preparation of Proxy Statement; MCI Stockholders Meeting... 22
         5.2  WorldCom Board of Directors; Officers; Headquarters; MCI Name.23
         5.3  Access to Information.................................. 24
         5.4  Best Efforts........................................... 24
         5.5  Acquisition Proposals.................................. 26
         5.6  [Intentionally Omitted]................................ 27
         5.7  Stock Options and Other Stock Plans; Employee Benefits Matters.27
         5.8  Fees and Expenses...................................... 27
         5.9  Directors' and Officers' Insurance..................... 27
         5.10  Rights Agreement...................................... 28
         5.11  Public Announcements.................................. 28
         5.12  Accountants' Letters.................................. 28
         5.13  Listing of Shares of WorldCom Common Stock............ 28
         5.14  Voting Trust.......................................... 28

                                   ARTICLE VI

         CONDITIONS PRECEDENT........................................ 29
         6.1  Conditions to Each Party's Obligation to Effect the Merger. 29
               (a)  Stockholder Approval............................. 29
               (b)  No Injunctions or Restraints, Illegality......... 29
               (c)  FCC and Public Utility Commission Approvals...... 29
               (d)  HSR Act.......................................... 29
               (e)  EU Antitrust..................................... 29
               (f)  NASDAQ Listing................................... 29
               (g)  Effectiveness of the Form S-4.................... 29
         6.2  Additional Conditions to Obligations of WorldCom and Merger Sub.30
               (a)  Representations and Warranties................... 30
               (b)  Performance of Obligations of MCI................ 30
               (c)  Tax Opinion...................................... 30
         6.3  Additional Conditions to Obligations of MCI............ 30
               (a)  Representations and Warranties................... 30
               (b)  Performance of Obligations of WorldCom........... 30
               (c)  Tax Opinion...................................... 31
               (d)  No Material Adverse Change....................... 31

                                   ARTICLE VII

         TERMINATION AND AMENDMENT................................... 31
         7.1  Termination............................................ 31
         7.2  Effect of Termination.................................. 32
         7.3  Payment by WorldCom.................................... 33
         7.4  Amendment.............................................. 33
         7.5  Extension; Waiver...................................... 34

                                  ARTICLE VIII

         GENERAL PROVISIONS.......................................... 34
         8.1  Non-Survival of Representations, Warranties and Agreements.. 34
         8.2  Notices................................................ 34
         8.3  Interpretation......................................... 35
         8.4  Counterparts........................................... 36
         8.5  Entire Agreement; No Third Party Beneficiaries......... 36
         8.6  Governing Law.......................................... 36
         8.7  Severability........................................... 36
         8.8  Assignment............................................. 36
         8.9  Submission to Jurisdiction; Waivers.................... 37
         8.10  Enforcement........................................... 37
         8.11  Definitions........................................... 37
         8.12  Other Agreements...................................... 38





<PAGE>




                                LIST OF EXHIBITS

         Exhibit                            Title


         5.2(a)     Reconstitution of the Board of Directors of WorldCom

         5.7        Stock Options and Other Stock-Based Plans;
                      Employee Benefit Matters




<PAGE>

















                          AGREEMENT AND PLAN OF MERGER

                          DATED AS OF NOVEMBER 9, 1997

                                      AMONG

                                 WORLDCOM, INC.

                              TC INVESTMENTS CORP.

                                       and

                         MCI COMMUNICATIONS CORPORATION




<PAGE>



EXHIBIT 5.2(a) TO THE MERGER AGREEMENT


              RECONSTITUTION OF THE BOARD OF DIRECTORS OF WORLDCOM


The Board of Directors of WorldCom,  as of the Effective Time,  shall consist of
fifteen  members,  eight of whom shall be  designated by WorldCom from among the
directors of WorldCom,  five of whom shall be  designated  by MCI from among the
directors of MCI and two of whom shall be directors  designated by WorldCom from
among pending acquisitions of WorldCom;  provided that the persons designated by
each party shall be reasonably acceptable to the other party.



<PAGE>



Exhibit 5.7



                     Outline of Employee Benefit Provisions


1.       All outstanding equity awards, including all ISUs, all
         restricted stock and all option grants will continue to vest
         (and be paid out) or become exercisable, as the case may be,
         in accordance with their current terms and will not be
         further accelerated in any way; provided, however, that if
         the Merger is not a pooling transaction, all such equity
         grants that have not otherwise previously lapsed or been
         forfeited shall vest upon the closing of the Merger.  Upon
         the Effective Time, any outstanding equity awards will be
         converted into shares (and options, as the case may be) of
         the Parent on identical terms.  Specifically:

                  On or prior to the Effective  Time,  MCI shall take all action
                  necessary  to cause  each  option  to  purchase  shares of MCI
                  Common Stock (each,  an "MCI Stock  Option")  that was granted
                  pursuant to the MCI Stock Option Plans prior to the  Effective
                  Time and which remains  outstanding  immediately  prior to the
                  Effective Time to be converted, at the Effective Time, into an
                  option to acquire,  on the same terms and  conditions  as were
                  applicable  under the MCI Stock Option,  that number of shares
                  of Parent's common stock  determined by multiplying the number
                  of shares of MCI Common Stock subject to such MCI Stock Option
                  by  the  Exchange  Ratio,  rounded,  if  necessary,  up to the
                  nearest whole share of Parent's  common stock,  at a price per
                  share equal to the per-share  exercise price specified in such
                  MCI Stock  Option  divided  by the  Exchange  Ratio;  provided
                  however,  that in the case of any MCI  Stock  Option  to which
                  section 421 of the Code applies by reason of its qualification
                  under section 422 of the Code, the option price, the number of
                  shares  subject to such option and the terms and conditions of
                  exercise  of such  option  shall  be  determined  in a  manner
                  consistent  with the  requirements  of  section  424(a) of the
                  Code.  In addition,  all  unvested  and unpaid MCI  restricted
                  stock and ISUs shall be  converted  to the number of shares of
                  Parent  common stock or ISUs  determined by  multiplying  such
                  shares of restricted stock and ISUs by the Exchange Ratio.

2.       The employment agreements covering the Senior Executives of MCI will be
         revised to:

         a.       eliminate the limitations on severance pay in the event
                  of a "Final Year Constructive Termination," as defined
                  in such contracts; and
         b.       add minimum bonus provisions to the contracts under
                  which each executive's annual bonuses could not be less



<PAGE>


                                        2



                  than the  average  annual  bonus  earned by the  executive  in
                  respect of 1994, 1995 and 1996.

3. The term of MCI's "Executive  Severance Policy" will be extended to the third
anniversary of the signing of this Agreement  except for those  provisions  that
would affect the equity  rights of a participant  in such Policy,  to the extent
necessary to preserve pooling.


4. A cash retention  award pool of up to $320 million will be created to provide
retention  incentives for MCI employees,  as determined by the MCI  Compensation
Committee  as soon as  practicable  hereafter.  The  schedule of payment of such
incentives  will be  subject  to the  approval  of  Parent,  which  will  not be
unreasonably  withheld;  and Parent will be informed as to the other  aspects of
the incentives.

<PAGE>



5. In addition, awards under the "Management Employee Bonus Program", the "Other
Employee Bonus Program" and the "Retention  Bonus Pool" currently  maintained by
MCI will be payable not earlier than:

                           50% on December 1, 1997; and
                           50% on December 1, 1998;

provided,  however that upon the closing date of any transaction,  involving the
sale or other  disposition  of a majority  of MCI's  stock or  assets,  any such
amounts that have not yet been paid will be accelerated and paid out.

6.  Executives  not covered by employment  contracts or the Executive  Severance
Policy will  participate  in a new  severance  program with a severance  formula
based on the guidelines  currently used for executive severance but in any event
shall not receive less than they would have received under  paragraph 7 below.
(See Appendix A).

7. All other  employees  below the levels  set forth in 6.  above  will  receive
severance of three weeks per year of service if terminated  in  connection  with
Merger.



<PAGE>


4









Appendix A

                       Executive Termination Pay Schedule


                 Director (9-11)  Vice President (12-13)    Pres. & Sr. VP (14+)
 Years of          Months of         Months of                Months of
                     Severance       Severance                Severance
1 year or less         4                6                         8
over 1 year            5                7                         9
over 2 years           5                7                        10
over 3 years           6                8                        10
over 4 years           7                9                        11
over 5 years           7               10                        12
6 or more years        8               10                        12



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