WORLDCOM INC /GA/
PRES14A, 1997-10-01
TELEPHONE COMMUNICATIONS (NO RADIOTELEPHONE)
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<PAGE>
                            SCHEDULE 14A INFORMATION
 
                  Proxy Statement Pursuant to Section 14(a) of
            the Securities Exchange Act of 1934 (Amendment No.    )
 
    Filed by the Registrant / /
    Filed by a Party other than the Registrant /X/
 
    Check the appropriate box:
    /X/  Preliminary Proxy Statement
    / /  Confidential, for Use of the Commission Only (as permitted by Rule
         14a-6(e)(2))
    / /  Definitive Proxy Statement
    / /  Definitive Additional Materials
    / /  Soliciting Material Pursuant to Section240.14a-11(c) or
         Section240.14a-12
 
                               MCI COMMUNICATIONS CORPORATION
- --------------------------------------------------------------------------------
                (Name of Registrant as Specified In Its Charter)
 
                                            WORLDCOM, INC.
- --------------------------------------------------------------------------------
    (Name of Person(s) Filing Proxy Statement, if other than the Registrant)
 
Payment of Filing Fee (Check the appropriate box):
 
/X/  No fee required.
/ /  Fee computed on table below per Exchange Act Rules 14a-6(i)(1)
     and 0-11.
     (1) Title of each class of securities to which transaction applies:
         -----------------------------------------------------------------------
     (2) Aggregate number of securities to which transaction applies:
         -----------------------------------------------------------------------
     (3) Per unit price or other underlying value of transaction computed
         pursuant to Exchange Act Rule 0-11 (set forth the amount on which the
         filing fee is calculated and state how it was determined):
         -----------------------------------------------------------------------
     (4) Proposed maximum aggregate value of transaction:
         -----------------------------------------------------------------------
     (5) Total fee paid:
         -----------------------------------------------------------------------
/ /  Fee paid previously with preliminary materials.
/ /  Check box if any part of the fee is offset as provided by Exchange Act Rule
     0-11(a)(2) and identify the filing for which the offsetting fee was paid
     previously. Identify the previous filing by registration statement number,
     or the Form or Schedule and the date of its filing.
     (1) Amount Previously Paid:
         -----------------------------------------------------------------------
     (2) Form, Schedule or Registration Statement No.:
         -----------------------------------------------------------------------
     (3) Filing Party:
         -----------------------------------------------------------------------
     (4) Date Filed:
         -----------------------------------------------------------------------
<PAGE>
         PRELIMINARY COPY--SUBJECT TO COMPLETION, DATED OCTOBER 1, 1997
                                [WORLDCOM LOGO]
 
Dear MCI Stockholders:
 
    As you probably know by now, WorldCom, Inc. has announced its intention to
make an exchange offer in which each outstanding share of common stock of MCI
Communications Corporation would be exchanged for $41.50 of WorldCom common
stock, subject to adjustment.
 
                      DO NOT SUPPORT AN INFERIOR PROPOSAL
 
    - The WorldCom proposal produces a substantially higher market value per MCI
      share than the proposal of British Telecommunications plc--a $[   ] per
      share premium, or an aggregate of approximately $         billion in
      excess of the BT proposal, based on closing prices on [         ], 1997.
 
    Now, the MCI board is soliciting your vote for the BT acquisition at a
meeting scheduled to be held on            , 1997, despite the higher market
value of the WorldCom proposal and the case laid out in the attached Proxy
Statement that the WorldCom exchange offer is superior.
 
                      PRESERVE YOUR OPPORTUNITY TO ACCEPT
                 THE OFFER PROVIDING THE HIGHEST MARKET VALUE;
                        VOTE AGAINST THE BT ACQUISITION
 
    WorldCom cannot complete its exchange offer if the MCI stockholders approve
the BT acquisition. Thus, WorldCom urges you to vote against the BT acquisition
and preserve your opportunity to accept the higher market value WorldCom offer.
If stockholders do not approve the BT acquisition:
 
    - We believe MCI's board would respect your vote, remove the obstacles it is
      maintaining to the completion of the WorldCom exchange offer (e.g., the
      MCI "poison pill" rights plan) and allow that offer to proceed.
 
    - In any event, WorldCom will continue to pursue its current litigation
      intended to force the MCI board to honor its fiduciary duties and remove
      the obstacles it is maintaining to a combination with WorldCom.
 
                             YOUR VOTE IS ESSENTIAL
 
    IF YOU WANT THE WORLDCOM OFFER TO SUCCEED, VOTE AGAINST THE BT PROPOSAL BY
SIGNING, DATING AND RETURNING THE ENCLOSED WHITE PROXY CARD TODAY.
 
                                          Sincerely,
                                          [Bernard J. Ebbers]
                                          President and
                                          Chief Executive Officer
<PAGE>
  Only stockholders of record on       , 1997 are entitled to vote.
  1. If your shares are held in your own name, please sign, date and return
     the enclosed WHITE proxy card in the postage-paid envelope provided. If
     your shares are held in the name of a brokerage firm, bank or other
     institution, please sign, date and return the WHITE proxy card to such
     brokerage firm, bank or other institution in the envelope provided by
     that firm.
 
  2. Please be sure your latest dated proxy is a WHITE card voting AGAINST the
     BT proposal. If you have already voted for the BT proposal on MCI's
     [color] proxy card, it is not too late to change your vote; simply sign,
     date and return the WHITE proxy card. ONLY YOUR LATEST DATED PROXY WILL
     BE COUNTED.
 
   If you have any questions or require any assistance in voting your shares,
  please call:
                            MACKENZIE PARTNERS, INC.
                                156 FIFTH AVENUE
                            NEW YORK, NEW YORK 10010
                 BANKS AND BROKERS CALL COLLECT: (212) 929-5500
                    ALL OTHERS CALL TOLL-FREE 1-800-322-2885
<PAGE>
         PRELIMINARY COPY--SUBJECT TO COMPLETION, DATED OCTOBER 1, 1997
                        SPECIAL MEETING OF STOCKHOLDERS
                                       OF
                         MCI COMMUNICATIONS CORPORATION
                            ------------------------
 
                                PROXY STATEMENT
                                       OF
                                 WORLDCOM, INC.
                            ------------------------
 
                     SOLICITATION OF PROXIES IN OPPOSITION
                           TO THE PROPOSED MERGER OF
                           MCI AND A SUBSIDIARY OF BT
 
    This Proxy Statement is furnished by WorldCom, Inc., a Georgia corporation
("WorldCom"), in connection with its solicitation of proxies (the "Proxy
Solicitation") to be used at a special meeting of stockholders of MCI
Communications Corporation ("MCI") to be held on        , 1997 at        , at
    a.m. local time, and at any adjournments, postponements or reschedulings
thereof (the "Special Meeting"). At the Special Meeting, the holders of shares
of common stock of MCI ("MCI Common Stock") and Class A common stock of MCI
("Class A Common Stock", and together with the MCI Common Stock, the "Shares")
("Stockholders") will be voting on whether to approve and adopt the Agreement
and Plan of Merger, dated as of November 3, 1996, as amended as of February 14,
1997 and August 21, 1997, by and among British Telecommunications plc ("BT"),
Tadworth Corporation, a subsidiary of BT ("BT Sub"), and MCI (the "BT/MCI Merger
Agreement") relating to a proposed acquisition of MCI by BT (the "Revised BT
Acquisition Proposal"). Pursuant to this Proxy Statement, WorldCom is soliciting
proxies from Stockholders to vote AGAINST MCI's proposal to approve and adopt
the BT/MCI Merger Agreement. According to the Proxy Statement/Prospectus of BT
and MCI dated       (the "BT/ MCI Proxy Statement"), MCI has fixed       as the
date of the Special Meeting and       , 1997 as the record date for determining
those Stockholders who will be entitled to vote at the Special Meeting (the
"Record Date"). This Proxy Statement is first being mailed to Stockholders on or
about       , 1997.
 
    On October 1, 1997, WorldCom announced its intention to commence an offer
(the "WorldCom Offer") to exchange shares of common stock, par value $.01 per
share, of WorldCom ("WorldCom Common Stock") for each share of MCI Common Stock
(including the shares of MCI Common Stock into which the outstanding shares of
Class A Common Stock would be automatically converted in accordance with the
provisions of MCI's Restated Certificate of Incorporation upon the tender of
such shares of Class A Common Stock into the WorldCom Offer) and all associated
preferred stock purchase rights (the "Rights"). The holder of each Share validly
tendered on or prior to the Expiration Date (as defined below) and not properly
withdrawn will be entitled to receive that number of shares of WorldCom Common
Stock equal to the Exchange Ratio. The "Exchange Ratio" means the quotient
(rounded to the nearest 1/10,000) determined by dividing $41.50 by the average
of the high and low sales prices of WorldCom Common Stock as reported on The
Nasdaq National Market (the "WorldCom Average Price") on each of the twenty
consecutive trading days ending with the third trading day immediately preceding
the Expiration Date; provided, that the Exchange Ratio shall not be less than
1.0375 nor greater than 1.2206. Accordingly, each Share will be exchanged for
WorldCom Common Stock having a market value of $41.50 if the WorldCom Average
Price is between $40.00 and $34.00. If the WorldCom Average Price is greater
than $40.00, each Share will be exchanged for WorldCom Common Stock having a
market value of more than $41.50 and, conversely, if the WorldCom Average Price
is less than $34.00, each Share will be exchanged for WorldCom Common Stock
having a market value of less than $41.50. Cash will be paid in lieu of any
fractional shares of WorldCom Common Stock. On [      ], the closing price of
WorldCom Common Stock as reported in The Nasdaq National Market was $[      ].
Based on a WorldCom Average Price equal to that amount, each Share would be
exchanged for WorldCom Common Stock having a market
<PAGE>
value of $         . The Exchange Ratio will change as the market value of
WorldCom Common Stock changes. The actual WorldCom Average Price and Exchange
Ratio will be calculated as of the third trading day immediately prior to the
Expiration Date, as described above, and a press release will be issued
announcing the actual Exchange Ratio prior to the opening of the second trading
day prior to the Expiration Date. The term "Expiration Date" shall mean 11:59
p.m., New York City time, on [    ], 1997 unless and until WorldCom extends the
period of time for which the WorldCom Offer is open, in which event the term
"Expiration Date" shall mean the latest date and time at which the WorldCom
Offer as so extended by WorldCom shall expire. WorldCom will, as soon as
practicable after consummation of the WorldCom Offer, merge one of its
wholly-owned subsidiaries with and into MCI (the "WorldCom Merger"). Pursuant to
the WorldCom Merger, each outstanding Share (except Shares held in the treasury
of MCI) would be converted into the right to receive the consideration that was
payable in the WorldCom Offer. Pursuant to the Restated Certificate of
Incorporation of MCI, the consent of the holders of a majority of the shares of
the Class A Common Stock is required for any "Business Combination" involving
MCI (which, as defined, would include the WorldCom Merger but would not include
the exchange of shares pursuant to the WorldCom Offer) to be effected prior to
October 1998. As of the date hereof, WorldCom believes that all of the Class A
Common Stock is held by BT. Accordingly, the consent of BT would be required in
order to effect the WorldCom Merger prior to October 1998. It is WorldCom's
current intention to consummate the WorldCom Offer as soon as the conditions to
the WorldCom Offer are satisfied and to consummate the WorldCom Merger in
October 1998 or earlier if the consent of BT is obtained. The purpose of the
WorldCom Offer is for WorldCom to obtain control of, and ultimately the entire
common equity interest in, MCI. The WorldCom Offer will be made solely pursuant
to WorldCom's prospectus dated October 1, 1997 (the "WorldCom Prospectus" and,
in the preliminary form dated October 1, 1997, the "WorldCom Preliminary
Prospectus") and the related Letter of Transmittal, which will be separately
mailed to Stockholders. For additional information concerning the WorldCom Offer
and the BT Acquisition, see the WorldCom Preliminary Prospectus. This Proxy
Statement is neither a request for the tender of Shares nor an offer with
respect thereto. The Offer is being made only by means of the Prospectus and the
related Letter of Transmittal.
 
    THE PURPOSE OF THIS PROXY SOLICITATION IS TO ENABLE HOLDERS OF MCI COMMON
STOCK TO DECIDE FOR THEMSELVES WHICH PROPOSAL IS SUPERIOR AND TO ACT
ACCORDINGLY. WORLDCOM IS SOLICITING PROXIES FROM STOCKHOLDERS AGAINST THE
REVISED BT ACQUISITION PROPOSAL. WORLDCOM URGES ALL STOCKHOLDERS TO VOTE AGAINST
APPROVAL AND ADOPTION OF THE BT/MCI MERGER AGREEMENT.
 
    TENDERING SHARES WILL NOT CONSTITUTE THE GRANT OF A PROXY IN CONNECTION WITH
THE BT/MCI MERGER AGREEMENT. WORLDCOM URGES YOU TO VOTE AGAINST THE BT/MCI
MERGER AGREEMENT AND PRESERVE YOUR OPPORTUNITY TO ACCEPT THE HIGHER MARKET VALUE
WORLDCOM OFFER. IF YOU WANT THE WORLDCOM OFFER TO SUCCEED, VOTE AGAINST THE
BT/MCI MERGER AGREEMENT BY SIGNING, DATING AND RETURNING THE ENCLOSED WHITE
PROXY CARD TODAY.
 
                                       2
<PAGE>
 
                                 IMPORTANT
 
    REJECTION OF THE BT/MCI MERGER AGREEMENT WILL SATISFY ONE OF THE
CONDITIONS TO THE WORLDCOM OFFER. IF YOU WANT THE WORLDCOM OFFER TO
SUCCEED, WE URGE YOU TO PROMPTLY SIGN, DATE AND MAIL THE ENCLOSED WHITE
PROXY CARD TO VOTE AGAINST THE BT/MCI MERGER AGREEMENT.
 
    YOU MUST TENDER YOUR SHARES PURSUANT TO THE WORLDCOM OFFER IF YOU WISH
TO PARTICIPATE IN THE WORLDCOM OFFER. YOUR VOTE AGAINST THE BT/MCI MERGER
AGREEMENT DOES NOT OBLIGATE YOU TO TENDER YOUR SHARES PURSUANT TO THE
WORLDCOM OFFER, AND YOUR FAILURE TO VOTE AGAINST THE BT/MCI MERGER
AGREEMENT DOES NOT PREVENT YOU FROM TENDERING YOUR SHARES PURSUANT TO THE
WORLDCOM OFFER.
 
    IF YOU HAVE ALREADY SENT A PROXY TO THE BOARD OF DIRECTORS OF MCI, YOU
MAY REVOKE THAT PROXY AND VOTE AGAINST THE BT/MCI MERGER AGREEMENT BY
SIGNING, DATING AND MAILING THE ENCLOSED WHITE PROXY CARD.
 
    WORLDCOM WILL WITHDRAW THE WORLDCOM OFFER IF THE STOCKHOLDERS OF MCI
APPROVE THE BT/MCI MERGER AGREEMENT.
 
    YOUR VOTE IS IMPORTANT NO MATTER HOW MANY OR HOW FEW SHARES YOU OWN.
 
    THIS PROXY STATEMENT IS NEITHER AN OFFER TO SELL NOR A SOLICITATION OF
OFFERS TO BUY ANY SECURITIES WHICH MAY BE ISSUED IN THE WORLDCOM OFFER OR
THE WORLDCOM MERGER OR SIMILAR BUSINESS COMBINATION INVOLVING WORLDCOM AND
MCI. THE ISSUANCE OF SUCH SECURITIES WOULD HAVE TO BE REGISTERED UNDER THE
SECURITIES ACT OF 1933 AND SUCH SECURITIES WOULD BE OFFERED ONLY BY MEANS
OF A PROSPECTUS COMPLYING WITH THE REQUIREMENTS OF SUCH ACT.
 
    Only Stockholders of record on the Record Date are entitled to vote.
 
    1. If your Shares are held in your own name, please sign, date and
       return the enclosed WHITE proxy card in the postage-paid envelope
       provided. If your shares are held in the name of a brokerage firm,
       bank or other institution, please sign, date and return the WHITE
       proxy card to such brokerage firm, bank or other institution in the
       envelope provided by that firm.
 
    2. Please be sure your latest dated proxy is a WHITE card voting
       AGAINST the BT proposal. If you have already voted for the BT
       proposal on MCI's [color] proxy card, it is not too late to change
       your vote; simply sign, date and return the WHITE proxy card. ONLY
       YOUR LATEST DATED PROXY WILL BE COUNTED.
    If you have any questions or require any assistance in voting your
shares, please call:
 
                         MACKENZIE PARTNERS, INC.
                             156 FIFTH AVENUE
                         NEW YORK, NEW YORK 10010
              BANKS AND BROKERS CALL COLLECT: (212) 929-5500
                 ALL OTHERS CALL TOLL-FREE 1-800-322-2885
 
                                       3
<PAGE>
                                  INTRODUCTION
 
    On October 1, 1997, WorldCom announced its intention to commence the
WorldCom Offer to exchange shares of WorldCom Common Stock for each Share. The
holder of each Share validly tendered on or prior to the Expiration Date and not
properly withdrawn will be entitled to receive that number of shares of WorldCom
Common Stock equal to the Exchange Ratio. Cash will be paid in lieu of any
fractional shares of WorldCom Common Stock. On [            ], the closing price
of WorldCom Common Stock as reported in The Nasdaq National Market was
$         . Based on a WorldCom Average Price equal to that amount, each Share
would be exchanged for WorldCom Common Stock having a market value of
$         . The Exchange Ratio will change as the market value of WorldCom
Common Stock changes. WorldCom will, as soon as practicable after consummation
of the WorldCom Offer, consummate the WorldCom Merger, in which each outstanding
Share (except for shares held in the treasury of MCI) would be converted into
the right to receive the consideration that was payable in the WorldCom Offer.
Pursuant to the Restated Certificate of Incorporation of MCI, the consent of the
holders of a majority of the shares of the Class A Common Stock is required for
any "Business Combination" involving MCI (which, as defined, would include the
WorldCom Merger but would not include the WorldCom Offer) to be effected prior
to October 1998. As of the date hereof, WorldCom believes that all of the Class
A Common Stock is held by BT. Accordingly, the consent of BT would be required
in order to effect the WorldCom Merger prior to October 1998. It is WorldCom's
current intention to consummate the WorldCom Offer as soon as the conditions to
the WorldCom Offer described in the WorldCom Preliminary Prospectus are
satisfied and to consummate the WorldCom Merger in October 1998 or earlier if
the consent of BT is obtained. The WorldCom Offer by its terms will expire on
           , 1997, but WorldCom currently intends to extend such offer from time
to time until all conditions thereto have been satisfied or waived. The WorldCom
Offer will be made solely pursuant to the WorldCom Preliminary Prospectus and
the related Letter of Transmittal, which will be separately mailed to
Stockholders. For additional information concerning the WorldCom Offer and the
Revised BT Acquisition Proposal, see the WorldCom Preliminary Prospectus.
 
    - A VOTE AGAINST THE REVISED BT ACQUISITION PROPOSAL ALLOWS YOU THE
      OPPORTUNITY TO RECEIVE GREATER VALUE FOR YOUR SHARES.
 
    The WorldCom Offer produces a substantially higher market value per Share
than the Revised BT Acquisition Proposal--a $[         ] per Share premium, or
an aggregate of approximately [         ] billion in excess of the Revised BT
Acquisition Proposal, based on closing prices on the last trading day before the
date of this Proxy Statement. See "Comparison of the Proposals--Purchase Price"
below.
 
    - A VOTE AGAINST THE REVISED BT ACQUISITION PROPOSAL WILL SATISFY ONE OF THE
      CONDITIONS IN THE WORLDCOM OFFER.
 
    One condition of the WorldCom Offer is that Stockholders disapprove the
Revised BT Acquisition Proposal at the Special Meeting. WorldCom will not
acquire Shares pursuant to the WorldCom Offer unless this condition has been
satisfied. Thus, a vote against the Revised BT Acquisition Proposal moves all
Stockholders closer to being able to benefit from the WorldCom Offer. For a
description of certain other conditions of the WorldCom Offer, see "Conditions
of the Offer" in the WorldCom Preliminary Prospectus.
 
    - A VOTE AGAINST THE REVISED BT ACQUISITION PROPOSAL SENDS A STRONG MESSAGE
      TO THE MCI BOARD THAT YOU WANT THE WORLDCOM OFFER TO SUCCEED.
 
    By voting against the Revised BT Acquisition Proposal, Stockholders can
demonstrate their support for the proposed combination of MCI and WorldCom. We
think the Stockholders themselves should have the right to decide whether the
WorldCom Offer is in their best interests.
 
    Failure to vote against the Revised BT Acquisition Proposal will not prevent
you from tendering your Shares in the WorldCom Offer, and a vote against the BT
Acquisition will not obligate you to tender your
 
                                       4
<PAGE>
Shares in the WorldCom Offer. However, we believe that a vote against the
Revised BT Acquisition Proposal will help secure the success of the WorldCom
Offer.
 
    THE PURPOSE OF THIS PROXY SOLICITATION IS TO ENABLE STOCKHOLDERS TO DECIDE
FOR THEMSELVES WHICH PROPOSAL IS SUPERIOR AND TO ACT ACCORDINGLY. WORLDCOM IS
SOLICITING PROXIES FROM STOCKHOLDERS AGAINST THE REVISED BT ACQUISITION
PROPOSAL. WORLDCOM URGES ALL STOCKHOLDERS TO VOTE AGAINST APPROVAL AND ADOPTION
OF THE BT/MCI MERGER AGREEMENT.
 
    WorldCom cannot complete the WorldCom Offer if the Stockholders approve the
BT/MCI Merger Agreement. Thus, WorldCom urges Stockholders to vote AGAINST the
BT/MCI Merger Agreement and preserve the opportunity to accept the higher value
WorldCom Offer. If Stockholders do not approve and adopt the BT/MCI Merger
Agreement, WorldCom believes the MCI Board would respect the Stockholders' vote,
remove the existing obstacles to the completion of the WorldCom Offer (e.g., the
MCI "poison pill" rights plan) and allow that offer to proceed. In any event,
WorldCom will continue to pursue its current litigation intended to force the
MCI Board to honor its fiduciary duties and remove the obstacles it is
maintaining to a combination with WorldCom.
 
                         BACKGROUND OF THE SOLICITATION
 
    THE ORIGINAL BT ACQUISITION PROPOSAL.  The following information concerning
MCI and BT has been derived from information filed by them with the Securities
and Exchange Commission (the "Commission"). BT acquired a 20% ownership interest
in MCI in 1994, and the companies subsequently created a joint venture known as
Concert Communications Company to provide global communications services. On
November 3, 1996, MCI entered into an Agreement and Plan of Merger with BT and a
subsidiary of BT (the "Original BT/MCI Merger Agreement"), under which the
stockholders of MCI and of BT would become the owners of a combined company, to
be known as Concert plc ("Concert"). In the transaction, each share of MCI
Common Stock would have been converted into the equivalent of 0.54 Concert
American Depositary Shares ("ADSs") plus $6.00 cash (the "Original BT
Acquisition Proposal"). For more information about the Original BT Acquisition
Proposal, see the Proxy Statement/Prospectus of MCI and BT dated March 3, 1997
(the "Original BT/MCI Proxy Statement/Prospectus"). The Original BT Acquisition
Proposal was approved by the MCI and BT stockholders in April 1997 and by the
European Commission on May 14, 1997. MCI and BT agreed to amendments to an
existing consent decree that were proposed by the Department of Justice ("DOJ")
on July 7, 1997, and the acquisition was approved by the Federal Communications
Commission (the "FCC") on August 21, 1997.
 
    THE REVISED BT ACQUISITION PROPOSAL.  On July 10, 1997, MCI announced that
previously-unanticipated material charges for 1997 could be incurred in its
local communications business. Following this announcement, MCI and BT conducted
a joint management review and subsequently announced, on August 22, 1997, the
Revised BT Acquisition Proposal, pursuant to which each outstanding share of MCI
Common Stock would be converted into the equivalent of 0.375 Concert ADSs plus a
cash payment of $7.75. As of the close of business on [          ], the current
market valuation of the Revised BT Acquisition Proposal is $          per Share
(after giving effect to the expected 1998 dividends payable to BT shareholders
that are not payable to holders of Shares).
 
    THE WORLDCOM OFFER.  On October 1, 1997, WorldCom announced its intention to
make the WorldCom Offer. In a publicly-released letter to Bert C. Roberts, Jr.,
the Chairman and Chief Executive Officer of MCI, describing the WorldCom Offer,
Bernard J. Ebbers, the President and Chief Executive Officer of WorldCom, noted
that the WorldCom Offer represents a 41% premium to MCI's closing stock price on
September 30, 1997 and that the WorldCom Offer is valued at approximately $30
billion--a premium of $9 billion to the market's current valuation of the
Revised BT Acquisition Proposal. Mr. Ebbers described WorldCom's intention to
establish a voting trust (the "Voting Trust") that would permit WorldCom to
consummate the exchange offer prior to receipt of final FCC and state public
utility commission ("PUC") approvals. Mr. Ebbers noted that clearances by U.S.
and other antitrust authorities
 
                                       5
<PAGE>
are the only regulatory conditions to the WorldCom Offer other than FCC approval
of the Voting Trust and that WorldCom was confident that it would obtain such
clearances not later than the first quarter of 1998. Mr. Ebbers stated that
WorldCom was prepared to meet promptly with MCI and BT to achieve a negotiated
transaction. Mr. Ebbers indicated WorldCom's willingness to enter into a merger
agreement between WorldCom and MCI with terms substantially similar to the
existing BT/MCI Merger Agreement, including the absence of a material adverse
change condition and the requirement that WorldCom pay a $750 million
termination fee if WorldCom's shareholders fail to approve the issuance of
WorldCom Common Stock in the WorldCom Merger. Mr. Ebbers stated that WorldCom
also believes that a negotiated transaction could be structured to be accounted
for as a pooling of interests and that such a transaction would be even more
beneficial to the stockholders of MCI, BT and WorldCom than the WorldCom Offer.
Mr. Ebbers stated that WorldCom expected that MCI's management would be an
important part of the combined company and that WorldCom would welcome members
of MCI's Board to its Board. Mr. Ebbers stated that the combined company would
be headquartered in Jackson, Mississippi and that WorldCom expected to maintain
a significant operating presence in Washington, D.C.
 
    LITIGATION.  On October 1, 1997, WorldCom filed a complaint in the Delaware
Court of Chancery against MCI, the members of the MCI Board, BT and BT Sub. The
complaint seeks, among other things, (i) a preliminary and permanent injunctive
relief enjoining MCI and its directors from breaching their fiduciary duty to
their stockholders by entering into or consummating the Revised BT Acquisition
Proposal without giving MCI's stockholders an opportunity to accept the WorldCom
Offer and enjoining BT and BT Sub from aiding and abetting that breach, (ii)
preliminary and permanent injunctive relief enjoining MCI and its directors from
conducting any stockholder vote on the Revised BT Acquisition Proposal that
differs procedurally from the stockholder votes contemplated by the BT/MCI
Merger Agreement (prior to any amendments thereto) and enjoining BT and BT Sub
from aiding and abetting the same, (iii) preliminary and permanent injunctive
relief requiring MCI and the defendant directors to take all steps necessary to
amend the Rights to make them inapplicable to the WorldCom Offer, (iv)
preliminary and permanent injunctive relief preventing MCI from otherwise taking
actions that impede or delay the WorldCom Offer, (v) preliminary and permanent
injunctive relief enjoining defendants from enforcing the termination fee
provisions of the BT/MCI Merger Agreement and (vi) an order declaring that the
WorldCom Offer does not constitute tortious interference with, or any other
business-related tort in connection with, the proposed acquisition of MCI by BT.
 
    TERMINATION AND TERMINATION FEE PROVISIONS OF THE BT/MCI MERGER
AGREEMENT.  In connection with the Revised BT Acquisition Proposal, the
termination provisions of the BT/MCI Merger Agreement were amended to provide
that the BT/MCI Merger Agreement can be terminated (a) by mutual written consent
of BT and MCI, (b) by either MCI or BT if the effective time of the merger
provided for thereunder has not occurred by December 31, 1997 (extendable to
April 30, 1998 under certain circumstances), (c) by either MCI or BT if any
governmental entity has issued an order or taken any other action prohibiting
the transaction or has failed to issue an order that is required to permit the
transaction, (d) by either MCI or BT if the approval of the stockholders of MCI
or of BT required for the consummation of the merger provided for thereunder (or
in the case of BT, the issuance of BT ADSs) is not obtained, (e) by either MCI
or BT if the Board of Directors of the other party withdraws its recommendation
of the BT/MCI Merger Agreement, fails to reaffirm its recommendation on request
or approves any acquisition (other than by the other party) prior to the
applicable stockholders meeting, (f) by either MCI or BT if, as a result of a
Superior Proposal (as defined in the BT/MCI Merger Agreement), such party
determines in good faith that its fiduciary obligations under applicable law
require that the Superior Proposal be accepted or (g) by either MCI or BT if the
other party is in breach of the BT/MCI Merger Agreement.
 
    MCI would be required to pay BT a termination fee of $450 million plus
expenses of up to $15 million if (x) BT terminates the BT/MCI Merger Agreement
pursuant to the provision described in clause (e) above while an Acquisition
Proposal (as defined in the BT/MCI Merger Agreement) is pending or (y) if MCI
terminates the BT/MCI Merger Agreement pursuant to the provision described in
clause (f) above.
 
                                       6
<PAGE>
Although MCI could be required to pay BT the termination fee plus expenses
described above if, in response to the WorldCom Offer, MCI were to change,
withdraw or fail to reaffirm its recommendation of the BT/MCI Merger Agreement
or approve a transaction with WorldCom, or if MCI were to terminate the BT/MCI
Merger Agreement on the grounds that the WorldCom Offer constitutes a Superior
Proposal that the MCI Board determines it is required to accept, UNDER THE TERMS
OF THE BT/MCI MERGER AGREEMENT AS AMENDED, MCI WOULD NOT BE REQUIRED TO PAY A
TERMINATION FEE IF THE BT/MCI MERGER AGREEMENT IS TERMINATED BECAUSE APPROVAL OF
THE STOCKHOLDERS OF MCI OF THE REVISED BT ACQUISITION PROPOSAL HAS NOT BEEN
OBTAINED AT THE SPECIAL MEETING OF STOCKHOLDERS OF MCI TO BE HELD ON
[            ], 1997 (SO LONG AS THE MCI BOARD HAD NOT MADE A DETERMINATION THAT
THE WORLDCOM OFFER CONSTITUTES A SUPERIOR PROPOSAL OR CHANGED, WITHDRAWN OR
FAILED TO REAFFIRM ITS RECOMMENDATION OF THE REVISED BT ACQUISITION PROPOSAL).
 
    MCI STOCKHOLDERS ARE EXPECTED TO VOTE ON THE REVISED BT ACQUISITION PROPOSAL
AT A SPECIAL MEETING OF STOCKHOLDERS OF MCI TO BE HELD ON [        ], 1997.
Assuming MCI's stockholders do not approve the BT/ MCI Merger Agreement, the
BT/MCI Merger Agreement condition to the WorldCom Offer will then be satisfied.
WorldCom believes that the MCI Board would at that point respect the vote of
MCI's stockholders and remove the existing obstacles to the WorldCom Offer and
WorldCom Merger, thereby satisfying the Rights Plan condition to the WorldCom
Offer. WorldCom also intends to pursue its currently pending litigation in order
to satisfy the Rights Plan condition. For further information about the Rights
Plan condition and WorldCom's plans for satisfying it, see "The Conditions of
the Offer--Rights Plan Condition" in the WorldCom Preliminary Prospectus.
 
                          COMPARISON OF THE PROPOSALS
 
COMPARISON OF THE PROPOSALS
 
    PURCHASE PRICE.  The WorldCom Offer provides a significant premium to the
market value of the Revised BT Acquisition Proposal.
 
                       IMPLIED PURCHASE PRICE PER SHARE*
 
<TABLE>
<CAPTION>
<S>                    <C>                    <C>                    <C>
                                                   REVISED BT
        DATE                 THE OFFER        ACQUISITION PROPOSAL       DIFFERENTIAL
<S>                    <C>                    <C>                    <C>
[            ], 1997             $                      $                      $
</TABLE>
 
*    Based on the closing price per share of WorldCom Common Stock and BT ADSs,
     as the case may be, on             , 1997, plus, in the case of the Revised
     BT Acquisition Proposal, $7.75 in cash. The value of BT ADSs has been
     adjusted to give effect to the expected 1998 dividends payable to BT
     shareholders that would not be received by holders of Shares.
 
    FEDERAL INCOME TAX CONSEQUENCES.  The WorldCom Offer is structured to be
tax-free to holders of Shares, while the Revised BT Acquisition Proposal would
result in holders of Shares being taxed on gain from the exchange to the extent
of the cash received. In the opinion of Bryan Cave LLP, special counsel to
WorldCom, exchanges of Shares for WorldCom Common Stock pursuant to the WorldCom
Offer and the WorldCom Merger, as described in the WorldCom Preliminary
Prospectus, should be treated for federal income tax purposes as exchanges
pursuant to a plan of reorganization within the meaning of the Internal Revenue
Code of 1986, as amended (the "Code"). Consequently, no gain or loss should be
recognized by holders of Shares upon such exchanges, except with respect to the
receipt of cash in lieu of fractional shares of WorldCom Common Stock.
 
    According to the Original BT/MCI Proxy Statement/Prospectus, a MCI
stockholder exchanging Shares for Concert ADSs and cash will realize gain
measured by the excess, if any, of (i) the sum of the amount in cash and the
fair market value of the Concert ADSs received over (ii) such stockholder's tax
basis in the Shares, which realized gain will be taxable to the extent of the
cash received. ACCORDINGLY, EVEN IF THE MARKET VALUE OF THE REVISED BT
ACQUISITION PROPOSAL WERE EQUAL TO THE MARKET VALUE OF THE WORLDCOM OFFER, MCI
STOCKHOLDERS WOULD RETAIN MORE VALUE UNDER THE WORLDCOM OFFER BECAUSE OF ITS
TAX-FREE NATURE.
 
                                       7
<PAGE>
    VALUE OF COMBINED COMPANY'S STOCK FOLLOWING THE TRANSACTION.  As noted
above, the WorldCom Offer provides a substantial premium to holders of Shares
compared to the Revised BT Acquisition Proposal. However, MCI stockholders
should also consider the prospects of the combined company that would result
from each proposed transaction in assessing the likely value of each prospective
combined company's stock after a combination with MCI. WorldCom believes that
MCI stockholders would be better positioned to realize higher returns in the
future through ownership of a WorldCom/MCI combined entity than through
ownership of a BT/MCI combined entity.
 
    Historical returns realized by WorldCom stockholders (which are not
necessarily indicative of future results) over the past decade have exceeded
those realized by investors in all other major U.S. telecommunications
companies. Since 1989, WorldCom has provided investors with a total compound
annual return of 55.8%, compared to 4.3% for MCI and 9.4% for BT. As described
below under "Strategic Fit", both MCI and WorldCom stockholders are expected to
benefit from the opportunity to own an entrepreneurial telecommunications
operator with a proven track record of shareholder value creation.
 
    According to the Original BT/MCI Proxy Statement/Prospectus, in considering
the Original BT Acquisition Proposal, the MCI Board considered concerns
expressed by members of MCI's management that BT's earnings forecasts indicated
slow to moderate growth and that BT had been losing market share and could
continue to do so in light of the new competitive environments in the U.K. and
Europe. According to the Original BT/MCI Proxy Statement/Prospectus, in
determining to approve the Original BT Acquisition Proposal despite these
concerns, the MCI Board relied in part upon "the anticipated benefits to be
received by the MCI stockholders in the proposed merger" (a consideration that
MCI stockholders may now want to reevaluate given the significantly lower value
of the Revised BT Acquisition Proposal as compared to the Original BT
Acquisition Proposal) and the MCI Board's view at the time that it was unlikely
that MCI would be able to "negotiate a combination with another company on terms
superior to the proposed Merger with BT". Given the reduced value of the Revised
BT Acquisition Proposal as compared to the Original BT Acquisition Proposal and
the availability of the WorldCom Offer--a merger proposal with a market value
significantly in excess of the market value of the Revised BT Acquisition
Proposal--as an alternative, WorldCom believes that MCI's original rationale for
combining with an entity whose future growth is expected to be slow to moderate
no longer applies.
 
    The WorldCom Offer would permit MCI's stockholders to participate in the
future results of the combined WorldCom/MCI entity with an approximately 45%
ownership position in the combined entity (based on certain assumptions), while
under the Revised BT Acquisition Proposal stockholders of MCI would only own
about 25% of the combined entity.
 
    SYNERGIES.  WorldCom believes that MCI stockholders, as well as MCI's
customers, employees and the communities it serves, would realize benefits from
the WorldCom Offer and the WorldCom Merger that are greater than the benefits
that would be realized if MCI either remains an independent entity or completes
is acquired by BT. WorldCom believes such greater benefits would be realized
through the following operational and structural synergies:
 
    - Operational cost savings.  Operational cost savings are expected to be
      realized primarily in four areas: avoided costs in MCI local activities;
      reduced sales, general and administrative costs in the combined company's
      domestic operations; reduced domestic network costs; and reduced network
      costs associated with terminating international traffic.
 
       -- AVOIDED COSTS IN MCI'S LOCAL ACTIVITIES.  As a result of WorldCom's
         existing extensive local network and operations, the combined company
         will be able to execute MCI's plans to expand in the local market at a
         lower cost than MCI would be able to on a standalone basis. The
         combined company will avoid the need to duplicate certain sales,
         marketing and administrative functions and will enjoy reduced network
         costs resulting from the more rapid transfer of traffic to the combined
         company's network facilities.
 
                                       8
<PAGE>
       -- REDUCED SALES AND ADMINISTRATIVE COSTS IN THE COMBINED COMPANY'S
         DOMESTIC OPERATIONS.  The increased scale of activities in the combined
         company's operations will result in opportunities to reduce costs by
         avoiding expenditures on duplicative activities, greater purchasing
         power and the adoption of best practices in cost containment across the
         entire company.
 
       -- REDUCED DOMESTIC NETWORK COSTS.  As a result of WorldCom's existing
         extensive local network, the combined company will carry an increased
         proportion of its domestic traffic on its own local network facilities
         resulting in a reduction in leased line costs and access costs
         associated with switched traffic. By combining WorldCom's and MCI's
         traffic, a reduction in variable network costs such as in-WATS,
         out-WATS and directory services are expected as a result of the
         combined company's greater purchasing power.
 
       -- REDUCED COST OF TERMINATING INTERNATIONAL TRAFFIC.  MCI currently
         enjoys more extensive settlement agreements for international traffic
         than does WorldCom. The combined company will benefit from terminating
         traffic on its facilities. In addition, as a result of construction of
         transatlantic facilities and network facilities in Europe, the combined
         company will be able to lower MCI's average costs of terminating
         certain traffic in Europe.
 
      Taking into account the costs expected to be incurred in achieving these
      potential operational savings and the time required to implement plans to
      lower costs, aggregate pre-tax operational costs savings (prior to
      interest and depreciation savings) of between $2.0 billion and $2.7
      billion are expected in 1999 and between $4.0 billion and $4.6 billion in
      2002.
 
    - Capital expenditure savings.  Capital expenditure savings are expected to
      be realized primarily in two areas: the combined company's domestic long
      distance network activities and the combined company's local network
      buildout. Capital expenditures relating to the combined company's long
      distance activities will be reduced primarily as a result of avoided
      duplicative fixed capital expenses and the cost benefits realized from
      increased purchasing power. Capital expenditures relating to the combined
      company's local activities will be reduced primarily as a result of
      avoided duplicative capital expenditures.
 
      Taking into account the costs expected to be incurred in achieving these
      potential capital expenditure savings and the time required to implement
      plans to lower capital expenditures, aggregate capital expenditure savings
      between $1.0 billion and $1.5 billion are expected in 1999 and between
      $1.5 billion and $1.6 billion in 2002.
 
    - Revenue benefits.  WorldCom expects that the combined company will benefit
      from greater revenues than the two companies would enjoy on a standalone
      basis. This increase in revenues is expected to result primarily from a
      reduction in customer attrition and from cross-selling a broader range of
      products and services. Although WorldCom believes that the potential
      revenue benefits are substantial, no attempt has been made to quantify
      these potential benefits.
 
    WorldCom has a track record of successfully integrating acquisitions and has
completed more than forty transactions over the past five years. The expertise
WorldCom has gained from these transactions is expected to assist WorldCom and
MCI in realizing the potential merger benefits. WorldCom's analyses of these
potential savings and benefits was based on publicly available information,
analysts' forecasts and WorldCom's knowledge of the telecommunications industry.
 
    STRATEGIC FIT.  The combination of MCI and WorldCom will accelerate
competition--especially in local markets--by creating a company with the
capital, marketing abilities and state-of-the-art network to compete against the
incumbent network carriers, domestically and abroad.
 
    Unlike BT, WorldCom is already a seasoned competitor in the U.S. local
market. WorldCom has an established presence in 52 local markets. WorldCom's
local network would both accelerate MCI's local strategy and result in
significant savings for the combined company. Creating a stronger competitor in
the
 
                                       9
<PAGE>
local market helps fulfill the intent of the Telecommunications Act of 1996.
Moreover, WorldCom believes that its extensive local network would solve the
widely recognized local market entry problem facing MCI.
 
    Combining WorldCom's pan-European fiber network in 12 cities in Europe with
MCI's international operations will create a leading alternative provider of
telecommunications services in key markets abroad. WorldCom and MCI will bring
complementary skills to compete in rapidly deregulating global markets.
 
    TIMING CONSIDERATIONS.  The WorldCom Offer is currently scheduled to expire
on [                ]; however, it is WorldCom's current intention to extend the
WorldCom Offer from time to time as necessary until all conditions to the
WorldCom Offer have been satisfied or waived. WorldCom expects that the WorldCom
Shareholder Approval Condition (as defined in the WorldCom Preliminary
Prospectus) will be satisfied by [                ] (the date by which it
expects to hold a special meeting of its shareholders to approve the issuance of
shares of WorldCom Common Stock pursuant to the WorldCom Offer and WorldCom
Merger) and that the other conditions to the WorldCom Offer could be satisfied
not later than the first quarter of 1998.
 
    With respect to FCC and state PUC approval, WorldCom will establish the
Voting Trust to facilitate the transaction. As a result, WorldCom believes that
it will be able to consummate the WorldCom Offer prior to receipt of final FCC
and state PUC approvals and that, accordingly, it could be in a position to
consummate the WorldCom Offer not later than the first quarter of 1998. Given
that BT and MCI must recirculate proxy materials to MCI stockholders reflecting
the Revised BT Acquisition Proposal and schedule a second stockholders meeting,
any acquisition of MCI by BT could not be consummated prior to the latter half
of the fourth quarter of 1997, at the earliest. Accordingly, WorldCom does not
believe that the Revised BT Acquisition Proposal offers any significant
advantage over the WorldCom Offer in terms of timing of completion. While BT
does have the ability under the terms of its Class A Common Stock to veto any
second-step merger between a subsidiary of WorldCom and MCI until October 1998,
BT's consent is not required in order for WorldCom to consummate the WorldCom
Offer. Since the WorldCom Offer can be consummated without the need of any
consent from BT and since the WorldCom Offer is being made for all outstanding
Shares, the ability of BT to block a second-step merger until October 1998 need
not delay the receipt of the WorldCom Common Stock by any holder of Shares.
 
                                       10
<PAGE>
                                    WORLDCOM
 
BUSINESS OF WORLDCOM
 
    WorldCom is one of the largest telecommunications companies in the United
States, serving local, long distance and Internet customers domestically and
internationally. WorldCom provides telecommunications services to business,
government, telecommunications companies and consumer customers, through its
network of fiber optic cables, digital microwave, and fixed and transportable
satellite earth stations.
 
    WorldCom is one of the first major facilities-based telecommunications
companies with the capability to provide business with high quality local, long
distance, data, and international communications services over its global
networks. With service to points throughout the nation and the world, WorldCom
provides telecommunications products and services including: switched and
dedicated long distance and local products, 800 services, calling cards,
domestic and international private lines, broadband data services, debit cards,
conference calling, advanced billing systems, enhanced fax and data connections,
high speed data communications, facilities management, local access to long
distance companies, local access ATM-based service and interconnection via
Network Access Points to Internet service providers.
 
    Each of WorldCom and MCI is subject to the informational requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in
accordance therewith files reports, proxy statements and other information with
the Commission. Such reports, proxy statements and other information filed by
each of WorldCom and MCI may be inspected and copied at the public reference
facilities maintained by the Commission at Room 1024, Judiciary Plaza, 450 Fifth
Street, N.W., Washington, D.C. 20549 and at the Commission's regional offices
located at Northeast Regional Office, Seven World Trade Center, Suite 1300, New
York, New York 10048 and Midwest Regional Office, Citicorp Center, 500 West
Madison Street, Suite 1400, Chicago, Illinois 60661. Copies of such materials
can also be obtained from the Public Reference Section of the Commission,
Judiciary Plaza, 450 Fifth Street, N.W., Washington, D.C. 20549, at prescribed
rates. The Commission maintains a Web site that contains reports, proxy and
information statements and other materials that are filed through the
Commission's Electronic Data Gathering, Analysis and Retrieval (EDGAR) System.
This Web site can be accessed at http://www.sec.gov. Shares of WorldCom's Common
Stock, depositary shares representing WorldCom's Series A 8% Cumulative
Convertible Preferred Stock, and the MCI Common Stock are included on The Nasdaq
Stock Market and the reports, proxy statements and other information filed by
WorldCom and MCI also can be inspected at the offices of the National
Association of Securities Dealers, Inc., at 1735 K Street, N.W., Washington,
D.C. 20006.
 
                               OTHER INFORMATION
 
    The information concerning MCI and the Revised BT Acquisition Proposal
contained herein has been taken from, or based upon, publicly available
documents on file with the Commission and other publicly available information.
WorldCom has not had access to the books and records of MCI. Accordingly,
WorldCom does not take any responsibility for the accuracy or completeness of
such information or for any failure by MCI to disclose events that may have
occurred and may affect the significance or accuracy of any such information.
 
    The BT/MCI Proxy Statement/Prospectus indicates that proposals of
Stockholders that are intended to be presented by such Stockholders at MCI's
1998 Annual Meeting of Stockholders (if neither of the proposed mergers are
consummated) must have been received by the Company no later than October 30,
1997 in order to be considered for inclusion in the proxy statement and form of
proxy relating to that meeting.
 
    Reference is made to the BT/MCI Proxy Statement/Prospectus for information
concerning the Shares, other information concerning the MCI's management and
certain other matters regarding MCI and the
 
                                       11
<PAGE>
Special Meeting. WorldCom does not take any responsibility for the accuracy or
completeness of any such information.
 
                             VOTING OF PROXY CARDS
 
PROCEDURAL INSTRUCTIONS
 
    The accompanying WHITE proxy card will be voted in accordance with the
Stockholder's instructions on such WHITE proxy card. Stockholders may vote
against the approval and adoption of the BT/MCI Merger Agreement or may withhold
their votes or vote for such approval and adoption by marking the proper box on
the WHITE proxy and signing, dating and returning it promptly in the enclosed
postage-paid envelope. If a Stockholder returns a WHITE proxy card that is
signed, dated and not marked, that Stockholder will be deemed to have voted
against approval and adoption of the BT/MCI Merger Agreement.
 
    Only Stockholders of record on the Record Date are eligible to give their
proxies. Therefore, any Stockholder owning shares held in the name of a
brokerage firm, bank, or other institution should sign, date and return the
WHITE proxy card to such brokerage firm, bank or other institution in the
envelope provided by that firm.
 
    Approval and adoption of the BT/MCI Merger Agreement requires the
affirmative vote of the holders of a majority of the outstanding shares of MCI
Common Stock and Class A Common Stock, voting together as a single class, and
the affirmative vote of the holders of a majority of the outstanding shares of
Class A Common Stock, voting as a separate class. Each Share is entitled to one
vote. According to the BT/ MCI Proxy Statement/Prospectus, as of the close of
business on the Record Date, there were outstanding [      ] shares of MCI
Common Stock and [      ] shares of Class A Common Stock. As of the date hereof,
WorldCom beneficially owns 602 Shares. Shares not voted (including broker
non-votes) and Shares voted to abstain from such vote will have the same effect
as a vote against the BT Acquisition.
 
    The accompanying WHITE proxy will be voted in accordance with the
Stockholder's instructions on such WHITE proxy. Stockholders may vote against
the Revised BT Acquisition Proposal, may vote for the Revised BT Acquisition
Proposal or may vote to abstain by marking the proper box on the WHITE proxy. If
no direction is given, the enclosed WHITE proxy will be voted AGAINST the
Revised BT Acquisition Proposal.
 
    WORLDCOM STRONGLY RECOMMENDS A VOTE AGAINST THE REVISED BT ACQUISITION
PROPOSAL.
 
    Whether or not you plan to attend the Special Meeting, we urge you to vote
AGAINST the Revised BT Acquisition Proposal by so indicating on the enclosed
WHITE proxy and immediately mailing it in the enclosed envelope. You may do this
even if you have already sent in the [color] proxy solicited by the MCI Board.
It is the last dated proxy that counts. Execution and delivery of a proxy by a
record holder of Shares will be presumed to be a proxy with respect to all
Shares held by such record holder unless the proxy specifies otherwise.
 
    WORLDCOM URGES YOU TO VOTE AGAINST THE BT/MCI MERGER AGREEMENT AND PRESERVE
YOUR OPPORTUNITY TO ACCEPT THE HIGHER VALUE WORLDCOM OFFER. IF YOU WANT THE
WORLDCOM OFFER TO SUCCEED, VOTE AGAINST THE BT/MCI MERGER AGREEMENT BY SIGNING,
DATING AND RETURNING THE ENCLOSED WHITE PROXY CARD TODAY.
 
REVOCATION OF PROXIES
 
    An executed proxy may be revoked at any time prior to its exercise by
submitting another proxy with a later date, by appearing in person at the
Special Meeting and voting or by sending a written, signed, dated revocation
which clearly identifies the proxy being revoked to either (a) WorldCom in care
of MacKenzie
 
                                       12
<PAGE>
Partners, Inc. at 156 Fifth Avenue, New York, New York 10010, or (b) the
principal executive offices of MCI at 1801 Pennsylvania Avenue, N.W.,
Washington, D.C. 20006. A revocation may be in any written form validly signed
by the record holder as long as it clearly states that the proxy previously
given is no longer effective. WorldCom requests that a copy of any revocation
sent to MCI also be sent to WorldCom in care of MacKenzie Partners, Inc. at the
above address so that WorldCom may more accurately determine if and when proxies
have been received from the holders of record on the Record Date of a majority
of the Shares then outstanding.
 
    IF YOU HAVE ALREADY SENT A PROXY CARD TO THE BOARD OF DIRECTORS OF MCI, YOU
MAY REVOKE THAT PROXY CARD AND VOTE AGAINST THE BT/MCI MERGER AGREEMENT BY
SIGNING, DATING AND RETURNING THE ENCLOSED WHITE PROXY CARD. THE LATEST DATED
PROXY CARD IS THE ONLY ONE THAT COUNTS.
 
APPRAISAL RIGHTS
 
    According to the BT/MCI Proxy Statement/Prospectus, Stockholders have the
right to demand appraisal of their Shares and to receive, instead of what BT is
offering in the Revised BT Acquisition Proposal, an amount that the Delaware
Court of Chancery decides is the "fair value" of the Shares.
 
                                       13
<PAGE>
                              OWNERSHIP OF SHARES
 
    Each Share is entitled to one vote, and the MCI Common Stock and the Class A
Common Stock are the only classes of securities of MCI currently entitled to
vote at the Special Meeting. According to MCI's Annual Report on Form 10-K for
the fiscal year ended December 31, 1996, there were 47,472 holders of record of
MCI Common Stock, and one holder of record of Class A Common Stock, as of
February 14, 1997, and according to MCI's Current Report on Form 8-K dated
August 26, 1997, as of August 19, 1997, there were 558,420,209 shares of MCI
Common Stock and 135,998,932 shares of Class A Common Stock outstanding.
 
    The following table sets forth the share ownership of all persons who own
beneficially more than 5% of MCI's outstanding Shares to the extent known by the
persons on whose behalf the Proxy Solicitation is being made. The information
below with respect to such beneficial ownership is based upon information filed
with the Commission pursuant to Section 13(d) or 14 of the Exchange Act.
 
<TABLE>
<CAPTION>
                                                                          AMOUNT
                                                                       AND NATURE OF
                                                                   BENEFICIAL OWNERSHIP
TITLE OF CLASS            NAME AND ADDRESS OF BENEFICIAL OWNER         OF SHARES(1)         PERCENT OF CLASS
- ---------------------  ------------------------------------------  ---------------------  ---------------------
<S>                    <C>                                         <C>                    <C>
Common Stock           FMR Corp.                                           36,782,809(1)          6.7%
                       82 Devonshire Street
                       Boston, Massachusetts
Common Stock           Mellon Bank Corporation                             28,798,000(2)          5.3%
                       One Mellon Center
                       Pittsburgh, Pennsylvania
Common Stock           The Capital Group Companies, Inc.                   27,537,500(3)          5.0%
                       333 South Hope Street
                       Los Angeles, California
Class A Common Stock   British Telecommunications plc                     135,998,932(4)          100%
                       81 Newgate Street
                       London, U.K.
</TABLE>
 
- ------------------------
 
(1) FMR Corp. has (i) sole voting power with respect to 3,362,311 of these
    shares and (ii) sole dispositive power with respect to 36,782,869 of these
    shares.
 
(2) Mellon Bank Corporation has (i) sole voting power with respect to 5,193,000
    of these shares, (ii) shared voting power with respect to 174,000 of these
    shares, (iii) sole investment power with respect to 5,485,000 of these
    shares and (iv) shared investment power with respect to 3,394,000 of these
    shares.
 
(3) The Capital Group Companies, Inc. has (i) sole voting power with respect to
    6,184,800 of these shares and (ii) sole dispositive power with respect to
    27,537,500 of these shares.
 
(4) BT has sole voting and investment power with respect to all these shares.
    These shares are convertible into shares of MCI Common Stock, and upon
    conversion would, when aggregated with the 732,499 shares of MCI Common
    Stock beneficially owned by BT, total 136,731,431 shares of MCI Common Stock
    or approximately 20% of the issued and outstanding shares of MCI Common
    Stock at February 14, 1997.
 
    For information relating to the ownership of Shares by the current directors
and executive officers of MCI, see Annex C hereto.
 
    The information concerning MCI contained in this Proxy Statement (including
Annex C hereto) has been taken from or is based upon documents and records on
file with the Commission and other publicly available information. WorldCom has
no knowledge that would indicate that statements relating to MCI
 
                                       14
<PAGE>
contained in this Proxy Statement in reliance upon publicly available
information are inaccurate or incomplete.
 
    Pursuant to Rule 12b-21 promulgated under the Exchange Act, WorldCom will
request that MCI and its independent public accountants, Price Waterhouse LLP,
provide to WorldCom the information required for complete disclosure concerning
the business, operations, financial condition and management of MCI. WorldCom
will provide any and all information that it receives from MCI or Price
Waterhouse LLP prior to the Special Meeting and that WorldCom deems material,
reliable and appropriate in a subsequently prepared amendment or supplement
hereto.
 
    The Original BT/MCI Proxy Statement/Prospectus contains additional
information concerning the Shares, beneficial ownership of the Shares by and
other information concerning MCI's directors and officers, compensation paid to
executive officers, and the principal holders of Shares.
 
                            SOLICITATION OF PROXIES
 
    Proxies will be solicited by mail, telephone, telegraph, telex, telecopier
and advertisement and in person. Solicitations may be made by directors,
executive officers and other representatives of WorldCom, none of whom will
receive additional compensation for such solicitation. See Annex A hereto for a
listing of such persons.
 
    In addition, WorldCom has retained MacKenzie Partners, Inc. ("MacKenzie") to
assist and to provide advocacy services in connection with this Proxy
Solicitation for which MacKenzie will be paid a fee of not more than $
and will be reimbursed for reasonable out-of-pocket expenses. WorldCom will
indemnify MacKenzie against certain liabilities and expenses in connection with
the Proxy Solicitation, including liabilities under the federal securities laws.
MacKenzie will solicit proxies from individuals, brokers, banks, bank nominees
and other institutional holders. Banks, brokerage houses and other custodians,
nominees and fiduciaries will be requested to forward the solicitation materials
to the beneficial owners of Shares for which they hold of record and WorldCom
will reimburse them for their reasonable out-of-pocket expenses in connection
therewith.
 
    Salomon Brothers Inc ("Salomon") is acting as Dealer Manager in connection
with the WorldCom Offer and is providing certain financial advisory services to
WorldCom in connection with its proposal to acquire MCI, including, among other
things, the Proxy Solicitation. For information concerning the fees to be paid
to Salomon in connection with such engagement, see "The Offer--Fees and
Expenses" in the WorldCom Preliminary Prospectus. WorldCom has also agreed to
reimburse Salomon for its reasonable out-of-pocket expenses, including the
reasonable fees and expenses of its legal counsel, incurred in connection with
its engagement, and has agreed to indemnify Salomon and certain related persons
and entities against certain liabilities and expenses in connection with its
engagement, including certain liabilities under federal securities laws. In
connection with Salomon's engagement as financial advisor, WorldCom anticipates
that certain employees of Salomon may communicate in person, by telephone or
otherwise with a limited number of institutions, brokers or other persons who
are Stockholders for the purpose of assisting in the Proxy Solicitation. Salomon
will not receive any fee for or in connection with such solicitation activities
by its employees apart from the fees it is otherwise entitled to receive as
described above.
 
    In addition to the fees to be received by Salomon in connection with its
engagement as financial advisor to WorldCom, since [           ], Salomon has
rendered various investment banking and financial advisory services for WorldCom
for which it has received customary compensation.
 
    The expenses related to the Proxy Solicitation will be borne by WorldCom.
WorldCom does not intend to seek reimbursement of its expenses related to the
Proxy Solicitation from MCI whether or not the Proxy Solicitation is successful.
Cost of this solicitation of proxies (excluding costs relating to the WorldCom
Offer) are currently estimated to be approximately $250,000.
 
                                       15
<PAGE>
    If you have any questions concerning this Proxy Solicitation or the
procedures to be followed to execute and deliver a proxy, please contact
MacKenzie at the address or phone number specified below.
 
    WorldCom is not aware of any other substantive matter to be considered at
the Special Meeting. However, if any other matter properly comes before the
Special Meeting, WorldCom will vote all proxies held by it as WorldCom, in its
sole discretion, may determine.
 
    YOUR PROXY AND PROMPT ACTION ARE IMPORTANT YOU ARE URGED TO GRANT YOUR PROXY
BY SIGNING, DATING AND RETURNING THE ENCLOSED WHITE PROXY CARD TODAY.
 
                                 WorldCom, Inc.
 
          , 1997
- --------------------------------------------------------------------------------
 
                            MACKENZIE PARTNERS, INC.
                                156 FIFTH AVENUE
                            NEW YORK, NEW YORK 10010
                BANKERS AND BROKERS CALL COLLECT: (212) 929-5000
                   ALL OTHERS CALL TOLL-FREE: 1-800-322-2885
 
- --------------------------------------------------------------------------------
 
                                       16
<PAGE>
                                    ANNEX A
                    INFORMATION CONCERNING THE DIRECTORS AND
               EXECUTIVE OFFICERS OF WORLDCOM AND OTHER EMPLOYEES
            AND REPRESENTATIVES OF WORLDCOM WHO MAY SOLICIT PROXIES
 
    The following tables set forth the name, business address and the present
principal occupation or employment, and the name, principal business and address
of any corporation or other organization in which such employment is carried on,
of the directors and executive officers of WorldCom and other representatives of
WorldCom who may solicit proxies from Stockholders of MCI. Unless otherwise
indicated, the principal business address of each director or executive officer
is 515 East Amite Street, Jackson, Mississippi 39201-2702.
 
                  DIRECTORS AND EXECUTIVE OFFICERS OF WORLDCOM
 
<TABLE>
<CAPTION>
                   NAME AND PRINCIPAL                                     PRESENT OFFICE OR OTHER
                    BUSINESS ADDRESS                                 PRINCIPAL OCCUPATION OR EMPLOYMENT
- --------------------------------------------------------  --------------------------------------------------------
 
<S>                                                       <C>
Carl J. Aycock                                            Self-employed as a financial administrator
123 South Railroad Avenue
Brookhaven, MS 39601
 
Max E. Bobbitt                                            President and Chief Executive Officer, Metromedia Asia
Metromedia Asia Corporation                               Corporation, a telecommunications company
110 East 42nd St.
  Suite 1501
New York, NY 10017
 
Bernard J. Ebbers                                         Chairman of the Board, President and Chief Executive
                                                          Officer of WorldCom
 
Francesco Galesi                                          Chairman and Chief Executive Officer, The Galesi Group,
435 East 52nd Street                                      which includes companies engaged in distribution,
New York, NY 10022                                        manufacturing, real estate and telecommunications
 
Richard R. Jaros                                          Private Investor
 
Stiles A. Kellet, Jr.                                     Chairman of Kellet Investment Corp.
200 Galleria Parkway,
  Suite 1800
Atlanta, GA 30339
 
David C. McCourt                                          Chairman of the Board and Chief Executive Officer, C-TEC
105 Carnegie Center                                       Corporation, a telecommunications company
Princeton, NJ 08540
 
John A. Porter                                            Chairman of the Board of Directors and Chief Executive
295 Bay Street                                            Officer, Industrial Electric Manufacturing, Inc., a
Suite #2                                                  manufacturer of electrical power distribution products
Easton, MD 21601
</TABLE>
 
                                      A-1
<PAGE>
 
<TABLE>
<CAPTION>
                   NAME AND PRINCIPAL                                     PRESENT OFFICE OR OTHER
                    BUSINESS ADDRESS                                 PRINCIPAL OCCUPATION OR EMPLOYMENT
- --------------------------------------------------------  --------------------------------------------------------
 
<S>                                                       <C>
John W. Sidgmore                                          Vice Chairman of the Board and Chief Operations Officer,
UUNET Technologies, Inc.                                  WorldCom, Inc.; President and Chief Executive Officer
3060 Williams Drive                                       and director of UUNET
Fairfax, VA 22031
 
Scott D. Sullivan                                         Chief Financial Officer and Secretary, WorldCom
 
Lawrence C. Tucker                                        General Partner, Brown Brothers Harriman & Co.
Brown Brothers Harriman & Co.
59 Wall Street
New York, NY 10005
</TABLE>
 
                                      A-2
<PAGE>
                  CERTAIN EMPLOYEES AND OTHER REPRESENTATIVES
                    OF WORLDCOM WHO MAY ALSO SOLICIT PROXIES
 
<TABLE>
<CAPTION>
                   NAME AND PRINCIPAL                                     PRESENT OFFICE OR OTHER
                    BUSINESS ADDRESS                                 PRINCIPAL OCCUPATION OR EMPLOYMENT
- --------------------------------------------------------  --------------------------------------------------------
<S>                                                       <C>
</TABLE>
 
                                      A-3
<PAGE>
                                    ANNEX B
 
         SHARES HELD BY WORLDCOM, ITS DIRECTORS AND EXECUTIVE OFFICERS
               AND CERTAIN EMPLOYEES AND OTHER REPRESENTATIVES OF
               WORLDCOM WHO MAY ALSO SOLICIT PROXIES, AND CERTAIN
                    TRANSACTIONS BETWEEN ANY OF THEM AND MCI
 
    WorldCom purchased 100 Shares on September 11, 1997 for $27.75 per share and
500 Shares on September 24, 1997 for $29.75 per share (in each case, excluding
mark-ups and commissions). As of September 30, 1997 WorldCom owned beneficially
602 Shares. No director or executive officer of WorldCom owns any Shares.
 
    Salomon engages in a full range of investment banking, securities trading,
market-making and brokerage services for institutional and individual clients.
In the ordinary course of its business, Salomon may actively trade the
securities of MCI for its own account and the accounts of its customers and,
accordingly, may at any time hold a long or short position in such securities.
As of [        ], 1997 Salomon held a net long position of approximately [    ]
Shares. Salomon does not admit that its or any of its directors, officers,
employees or affiliates is a "participant," as defined in Schedule 14A
promulgated under the Exchange Act by the Commission, in the solicitation to
which this Proxy Statement relates or that such Schedule 14A requires the
disclosure in this Proxy Statement of certain information concerning Salomon.
 
    WorldCom and MCI have entered into certain interconnection or other services
agreements with each other and certain of their affiliates in the ordinary
course of their businesses, which agreements have been amended from time to
time. In the six months ended June 30, 1997, fiscal 1996, fiscal 1995 and fiscal
1994, MCI and its subsidiaries and WorldCom and its subsidiaries have engaged in
transactions aggregating $180.0 million, $418.0 million, $240.0 million and
$180.0 million, respectively.
 
    Except as disclosed in this Proxy Statement, to the best knowledge of
WorldCom, none of WorldCom, its directors and executive officers or other
employees and representatives of WorldCom named in Annex A hereto has any
interest, direct or indirect, by security holdings or otherwise, in MCI except
that an associate of Mr. John A. Porter, Phillips & Brooks Gladwin, Inc., sells
pay phone equipment, installation and maintenance services to MCI in an annual
amount of $200,000.
<PAGE>
                                    ANNEX C
             SHARES HELD BY DIRECTORS AND EXECUTIVE OFFICERS OF MCI
 
    The following table sets forth as of December 31, 1996 the number of Shares
beneficially owned by each director, the chief executive officer and each of the
other three executive officers named in the Original BT/MCI Proxy
Statement/Prospectus (and by all directors and executive officers as a group) of
MCI. The information contained in the table is derived from information
contained in the Original BT/ MCI Proxy Statement/Prospectus.
 
<TABLE>
<CAPTION>
                                                                          AMOUNT
                                                                       AND NATURE OF
                                                                   BENEFICIAL OWNERSHIP
TITLE OF CLASS            NAME AND ADDRESS OF BENEFICIAL OWNER         OF SHARES(1)         PERCENT OF CLASS
- ---------------------  ------------------------------------------  ---------------------  ---------------------
<S>                    <C>                                         <C>                    <C>
DIRECTORS WHOSE TERMS EXPIRE IN 1997
Common Stock           Clifford L. Alexander, Jr.                              36,000(2)            *
                       400 C Street, N.E.
                       Washington, D.C. 20002
Common Stock           Richard M. Jones                                        50,000(3)            *
                       13000 West Silver Spring Drive
                       Butler, Wisconsin 53007
Common Stock           K. Rupert Murdoch                                               0            *
                       2 Holt Street
                       Surry Hills, Sydney NSW 2010
                       10036, Australia
Common Stock           John R. Worthington                                    288,147(4)            *
                       1801 Pennsylvania Avenue, N.W.
                       Washington, D.C. 20006
 
CLASS A DIRECTORS
Common Stock           Sir Peter L. Bonfield                                      350(5)            *
                       BT Centre
                       81 Newgate Street
                       London, England EC1A 7AJ
Common Stock           Sir Colin M. Marshall                                        0(6)            *
                       Berkeley Square House
                       Berkeley Square
                       London, W1X 6BA
Common Stock           J. Keith Oates                                               0(7)            *
                       Michael House
                       Baker Street
                       London, W1A 1DN, England
 
DIRECTORS WHOSE TERMS EXPIRE IN 1998
Common Stock           Michael H. Bader                                       416,074(8)            *
                       4350 North Fairfax Drive
                       Suite 900
                       Arlington, Virginia 22203
Common Stock           Gordon S. Macklin                                       54,000(9)            *
                       777 Westchester Avenue
                       White Plains, New York 10604
Common Stock           Bert C. Roberts, Jr.                                2,144,174(10)            *
                       1801 Pennsylvania Avenue, N.W.
                       Washington, D.C. 20006
Common Stock           Richard B. Sayford                                     50,990(11)            *
                       8 Silver Fox Drive
                       Greenwood Village, Colorado 80121
</TABLE>
 
                                      C-1
<PAGE>
<TABLE>
<CAPTION>
                                                                          AMOUNT
                                                                       AND NATURE OF
                                                                   BENEFICIAL OWNERSHIP
TITLE OF CLASS            NAME AND ADDRESS OF BENEFICIAL OWNER         OF SHARES(1)         PERCENT OF CLASS
- ---------------------  ------------------------------------------  ---------------------  ---------------------
DIRECTORS WHOSE TERMS EXPIRE IN 1999
<S>                    <C>                                         <C>                    <C>
Common Stock           Judith Areen                                           40,000(12)            *
                       600 New Jersey Avenue, N.W.
                       Washington, D.C. 20001
Common Stock           Gerald H. Taylor                                    1,104,608(13)            *
                       1801 Pennsylvania Avenue, N.W.
                       Washington, D.C. 20006
Common Stock           Judith Whittaker                                       51,000(14)            *
                       2501 McGee Trafficway
                       Kansas City, Missouri 64108
</TABLE>
 
- ------------------------
(1) Unless otherwise noted, each person has sole voting power and sole
    investment power with respect to the securities reported, except with
    respect to shares of MCI Common Stock allocated to accounts under MCI's
    Employee Stock Ownership and 401(k) Plan ("ESOP"), with respect to which
    shares such person has sole voting power only. Where indicated, the data
    also include shares which each person had the right to acquire upon exercise
    of stock options within sixty days of December 31, 1996 and also shares
    issued as awards of restricted stock and/or incentive stock units ("ISUs").
    As of December 31, 1996, no individual officer or director beneficially
    owned more than 1% of the outstanding shares of any class of MCI's capital
    stock.
 
(2) Includes 30,000 shares of MCI Common Stock Mr. Alexander has the right to
    acquire pursuant to the exercise of stock options. Mr. Alexander shares
    voting and investment power with respect to all shares other than those
    which he has the right to acquire pursuant to the exercise of such stock
    options.
 
(3) Includes 30,000 shares of MCI Common Stock Mr. Jones has the right to
    acquire pursuant to the exercise of stock options.
 
(4) Does not include 147,890 shares of MCI Common Stock owned solely by Mr.
    Worthington's wife, in which shares he disclaims beneficial ownership.
 
(5) Sir Peter Bonfield is an executive officer and director of BT, the holder of
    all the outstanding Class A Common Stock and 732,499 shares of MCI Common
    Stock.
 
(6) Sir Colin Marshall is a director of BT, the holder of all the outstanding
    Class A Common Stock and 732,499 shares of MCI Common Stock.
 
(7) Mr. Oates is a director of BT, the holder of all the outstanding Class A
    Common Stock and 732,499 shares of MCI Common Stock.
 
(8) Includes 30,000 shares of MCI Common Stock Mr. Bader has the right to
    acquire pursuant to the exercise of stock options. Mr. Bader shares voting
    and investment power with respect to all shares other than those which he
    has the right to acquire pursuant to the exercise of such stock options. Mr.
    Bader is one of seven trustees for the William G. McGowan Charitable Fund,
    Inc.; he does not, however, have voting or investment power over any of the
    shares of MCI Common Stock held by such Fund.
 
(9) Includes 30,000 shares of MCI Common Stock Mr. Macklin has the right to
    acquire pursuant to the exercise of stock options. Does not include 3,200
    shares of MCI Common Stock owned solely by Mr. Macklin's wife, in which
    shares he disclaims beneficial ownership.
 
(10) Includes 45,836 shares of MCI Common Stock allocated to Mr. Roberts' ESOP
    account, 1,218,400 shares of MCI Common Stock he has the right to acquire
    pursuant to the exercise of stock options, 322,536 shares of MCI Common
    Stock issued as restricted stock awards and 119,400 shares of MCI Common
    Stock owned by a limited partnership in which Mr. Roberts is a general
    partner. Does not include 12,000 shares of MCI Common Stock held by Mr.
    Roberts' wife as custodian for the benefit of their minor child, in which
    shares Mr. Roberts disclaims beneficial ownership.
 
(11) Includes 30,000 shares of MCI Common Stock Mr. Sayford has the right to
    acquire pursuant to the exercise of stock options. Does not include 800
    shares of MCI Common Stock owned solely by Mr. Sayford's wife, in which
    shares he disclaims beneficial ownership.
 
(12) Includes 36,000 shares of MCI Common Stock Ms. Areen has the right to
    acquire pursuant to the exercise of stock options.
 
                                      C-2
<PAGE>
OTHER EXECUTIVE OFFICERS OF MCI
 
<TABLE>
<CAPTION>
                                                                          AMOUNT
                                                                       AND NATURE OF
                                                                   BENEFICIAL OWNERSHIP
TITLE OF CLASS            NAME AND ADDRESS OF BENEFICIAL OWNER         OF SHARES(1)         PERCENT OF CLASS
- ---------------------  ------------------------------------------  ---------------------  ---------------------
<S>                    <C>                                         <C>                    <C>
Common Stock           Timothy F. Price                                       614,601(2)            *
                       1801 Pennsylvania Avenue, N.W.
                       Washington, D.C. 20006
Common Stock           Michael J. Rowny                                       293,658(3)            *
                       1801 Pennsylvania Avenue, N.W.
                       Washington, D.C. 20006
Common Stock           Douglas L. Maine                                       528,145(4)            *
                       1801 Pennsylvania Avenue, N.W.
                       Washington, D.C. 20006
 
All executive officers and directors as a group(5)                          7,310,661(6)
</TABLE>
 
- ------------------------
 
(1) Unless otherwise noted, each person has sole voting power and sole
    investment power with respect to the securities reported, except with
    respect to shares of MCI Common Stock allocated to accounts under the ESOP,
    with respect to which shares such person has sole voting power only. Where
    indicated, the data also include shares which each person had the right to
    acquire upon exercise of stock options within sixty days of December 31,
    1996, and also shares issued as awards of restricted stock and/or ISUs.
 
(2) Includes 14,428 shares of MCI Common Stock allocated to Mr. Price's ESOP
    account, 230,670 shares of MCI Common Stock he has the right to acquire
    pursuant to the exercise of stock options and 351,950 shares of MCI Common
    Stock issued as ISUs. Does not include 1,000 shares of MCI Common Stock held
    by Mr. Price's wife as custodian for the benefit of their minor children, in
    which shares Mr. Price disclaims beneficial ownership.
 
(3) Includes 645 shares of MCI Common Stock allocated to Mr. Rowny's ESOP
    account, 125,400 shares of MCI Common Stock he has the right to acquire
    pursuant to the exercise of stock options and 165,000 shares of MCI Common
    Stock issued as ISUs.
 
(4) Includes 14,100 shares of MCI Common Stock allocated to Mr. Maine's ESOP
    account, 357,860 shares of MCI Common Stock he has the right to acquire
    pursuant to the exercise of stock options and 140,100 shares of MCI Common
    Stock issued as ISUs. Does not include 600 shares of MCI Common Stock held
    by Mr. Maine's wife as custodian for the benefits of a minor child, in which
    shares of MCI Common Stock Mr. Maine disclaims beneficial ownership.
 
(5) This group includes MCI's executive officers, as such term is defined in
    Rule 3b-7 of the Exchange Act, and its directors, a total of 22 persons.
 
(6) Includes 141,615 shares of MCI Common Stock allocated to such officers'
    accounts under the ESOP, 3,589,850 shares of MCI Common Stock that officers
    and directors have the right to acquire pursuant to the exercise of stock
    options and 2,208,636 shares of MCI Common Stock issued to officers pursuant
    to restricted stock awards and/or ISUs. Officers and directors have shared
    voting and investment power with respect to 392,074 of these shares of MCI
    Common Stock.
 
                                      C-3
<PAGE>
                    PRELIMINARY COPY--SUBJECT TO COMPLETION
                         [FORM OF PROXY CARD-WORLDCOM]
                          PROXY SOLICITED BY WORLDCOM
       IN OPPOSITION TO THE PROXY SOLICITED BY THE BOARD OF DIRECTORS OF
                         MCI COMMUNICATIONS CORPORATION
 
    Unless otherwise specified below, the undersigned, a holder of record of
shares of Common Stock, par value $.10 per share and/or shares of Class A Common
Stock, par value $.10 per share (collectively, the "Shares"), of MCI
Communications Corporation ("MCI") on            , 1997 (the "Record Date"),
hereby appoints       and       , or either of them, the proxy or proxies of the
undersigned, each with full power of substitution, to attend the Special Meeting
of Stockholders of MCI to be held on            , 1997 at which holders of
Shares will be voting on approval and adoption of the Agreement and Plan of
Merger, dated as of November 3, 1996, as amended as of February 14, 1997 and
August 21, 1997, by and among British Telecommunications plc ("BT"), a
wholly-owned subsidiary of BT, and MCI (the "BT/MCI Merger Agreement"), and at
any adjournments, postponements or reschedulings thereof, and to vote as
specified in this Proxy all the Shares which the undersigned would otherwise be
entitled to vote if personally present. The undersigned hereby revokes any
previous proxies with respect to the matters covered in this proxy.
 
            WORLDCOM RECOMMENDS A VOTE AGAINST APPROVAL AND ADOPTION
                        OF THE BT/MCI MERGER AGREEMENT.
          (IF RETURNED CARDS ARE SIGNED AND DATED BUT NOT MARKED, THE
   UNDERSIGNED WILL BE DEEMED TO HAVE INSTRUCTED THE PROXIES TO VOTE AGAINST
             APPROVAL AND ADOPTION OF THE BT/MCI MERGER AGREEMENT.)
<PAGE>
1. Approval and adoption of the BT/MCI Merger Agreement.
 
                     / / AGAINST    / / ABSTAIN    / / FOR
 
2. In their discretion, the Proxies are authorized to vote upon such other
business as may properly come before the meeting.
 
IF YOU HAVE ANY QUESTIONS OR NEED ASSISTANCE CONCERNING THIS PROXY, PLEASE
CONTACT MacKENZIE PARTNERS, INC. AT (800) 322-2885
 
    Proxies can only be given by Stockholders of record on the Record Date.
Please sign your name below exactly as it appears on your stock certificate(s)
on the Record Date or on the label affixed hereto. When Shares are held of
record by joint tenants, both should sign. When signing as attorney, executor,
administrator, trustee or guardian, please give full title as such. If a
corporation, please sign in full corporate name by president or authorized
officer. If a partnership, please sign in partnership name by authorized person.
                                         Dated: __________________________, 1997
                                         _______________________________________
                                                Signature (Title, if any)
                                         _______________________________________
                                                Signature if held jointly
 
    PLEASE SIGN, DATE AND RETURN PROXY PROMPTLY IN THE ENCLOSED POSTAGE-PAID
                                   ENVELOPE.


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