MORGAN STANLEY DEAN WITTER & CO
424B3, 1999-03-25
FINANCE SERVICES
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PROSPECTUS Dated March 26, 1998                    Pricing Supplement No. 64 to
PROSPECTUS SUPPLEMENT                      Registration Statement No. 333-46935
Dated March 26, 1998                                       Dated March 18, 1999
                                                                 Rule 424(b)(3)


                                   $16,005,000
                        Morgan Stanley Dean Witter & Co.
                           MEDIUM-TERM NOTES, SERIES C
                             Senior Fixed Rate Notes

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

                      Exchangeable Notes Due March 2, 2006
                   Exchangeable for Shares of Common Stock of
                               MCI WORLDCOM, INC.

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


The notes will not pay any interest but will be issued at a discount and thus
have a minimum yield to maturity of 0.25%. Beginning May 25, 1999, you will be
able to exchange your notes for a number of shares of MCI WorldCom common stock,
subject to our right to call all of the notes on or after February 25, 2002.

o    The price of each note is $982.85 (98.285% of the $1,000 principal amount
     at maturity). This issue price represents a yield to maturity of 0.25% per
     year compounded semi-annually.

o    We will not make any coupon interest payments on the notes.

o    Beginning May 25, 1999, you will have the right to exchange each Note for
     9.25 shares of MCI WorldCom common stock. If you exchange, we will have the
     right to deliver either the actual shares or the cash value of such shares
     to you. You will not receive any accrued original issue discount.

o    Beginning February 25, 2002, we have the right to call all of the notes and
     pay you the call price, which will be an amount per note equal to the issue
     price of $982.85 plus accrued original issue discount, or OID, to the call
     date. However, if the market value of 9.25 shares of MCI WorldCom common
     stock on the last trading day before we send our call notice is equal to or
     greater than the call price, we will deliver to you 9.25 shares of MCI
     WorldCom common stock per note instead.

o    If we decide to call the notes, we will give you notice at least 30 but not
     more than 60 days before the call date specified in the notice. If we
     notify you that we will be delivering shares of MCI WorldCom common stock
     on the call date, rather than the cash call price, you will still be able
     to exercise your exchange right on any day prior to the call date.

o    If you hold the notes to maturity, we will pay you $1,000 per note.

o    MCI WorldCom is not involved in this offering of the notes in any way and
     will have no financial obligation with respect to the notes.

o    The notes have been approved for listing on the New York Stock Exchange,
     Inc., subject to official notice of issuance. The NYSE listing symbol for
     the notes is "MSWCOM ZRB06."

You should read the more detailed description of the notes in this Pricing
Supplement. In particular, you should review and understand the descriptions in
"Summary of Pricing Supplement" and "Description of Notes."

The notes involve risks not associated with an investment in conventional debt
securities. See "Risk Factors" beginning on PS-6.

                            -----------------------
                                 PRICE 98.285%
                            -----------------------

                    Price to Public    Agent's Commission   Proceeds to Company
                    ---------------    ------------------   -------------------
Per Note........        98.285%               0.25%               98.035%
Total...........    $15,730,514.25         $40,012.50         $15,690,501.75


                          MORGAN STANLEY DEAN WITTER

<PAGE>

                      (This page intentionally left blank)



                                      PS-2

<PAGE>



                         SUMMARY OF PRICING SUPPLEMENT

     The following summary describes the notes we are offering to you in
general terms only. You should read the summary together with the more detailed
information that is contained in the rest of this pricing supplement and in the
accompanying prospectus and prospectus supplement. You should carefully
consider, among other things, the matters set forth in "Risk Factors."

                                   The Notes

Each note costs $982.85            We, Morgan Stanley Dean Witter & Co., are
                                   offering you Exchangeable Notes due March 2,
                                   2006, which you may exchange for MCI
                                   WorldCom, Inc. common stock ("MCI WorldCom
                                   Stock") beginning on May 25, 1999. The price
                                   of each note is $982.85 (98.285% of the
                                   $1,000 principal amount at maturity). We
                                   will not pay interest on the notes. If you
                                   hold the notes to maturity, which is March
                                   2, 2006, we will pay you $1,000 per note.
                                   This payment represents the $982.85 issue
                                   price plus a yield to maturity of 0.25% per
                                   year compounded semi-annually.

                                   Your Exchange Right

The exchange ratio                 Beginning May 25, 1999, you may exchange
is 9.25                            each note for a number of shares of
                                   MCI WorldCom Stock equal to the exchange
                                   ratio. The exchange ratio is 9.25 shares of
                                   MCI WorldCom Stock per note, subject to
                                   adjustment for certain corporate events
                                   relating to MCI WorldCom, Inc. ("MCI
                                   WorldCom"). When you exchange your notes,
                                   Morgan Stanley & Co. Incorporated ("MS &
                                   Co."), acting as calculation agent, will
                                   determine the exact number of shares you
                                   will receive based on the principal amount
                                   of the notes you exchange and the exchange
                                   ratio as it may have been adjusted through
                                   the time of the exchange.

                                   To exchange a note on any day, you must
                                   instruct your broker or other person with
                                   whom you hold your notes to take the
                                   following steps through normal clearing
                                   system channels:

                                   o  fill out an Official Notice of Exchange,
                                      which is attached as Annex A to this
                                      Pricing Supplement;

                                   o  deliver your Official Notice
                                      of Exchange to us before 11:00 a.m. (New
                                      York City time) on that day; and

                                   o  deliver your note certificate to The Chase
                                      Manhattan Bank, as trustee for our senior
                                      notes, on that day.

                                   If you give us your Official Notice of
                                   Exchange after 11:00 a.m. (New York City
                                   time) on any day or on a day when the stock
                                   markets are closed, your notice will not
                                   become effective until the next day that the
                                   stock markets are open.

We can choose to pay you           We will pay you, at our option, within 3
cash or MCI WorldCom               business days after you give us your Official
Stock if you elect to              Notice of Exchange, either: 
exchange your notes
                                   o  shares of MCI WorldCom Stock, or

                                   o  the cash value of such shares.




                                      PS-3

<PAGE>




                                   We will not pay any accrued original issue
                                   discount if you elect to exchange your notes.

                                   Our right to call the notes may affect your
                                   ability to exchange your notes.

                                   Our Call Right

                                   Beginning February 25, 2002, we have the
                                   right to call all of the notes. If we call
                                   the notes, we will do the following:

                                   o  send a notice announcing that we have
                                      decided to call the notes;

                                   o  specify in the notice a call date when
                                      you will receive payment in exchange for
                                      delivering your notes to the trustee; that
                                      call date will not be less than 30 or more
                                      than 60 days after the date of the notice;
                                      and

                                   o  specify in the notice the number of
                                      shares of MCI WorldCom Stock or the cash
                                      call price that we will pay you in
                                      exchange for each note, as explained in
                                      the next paragraph.

We may call the notes for          On the last trading day before the date
stock or cash, depending           of our call notice, the calculation
on the price of MCI WorldCom       agent will determine the value of the
Stock                              shares of MCI WorldCom Stock that a
                                   noteholder would receive upon exchange
                                   of a note. That value is referred to as
                                   parity. If parity is less than the call
                                   price (the sum of the issue price of
                                   $982.85 plus the yield that will have
                                   accrued on the note to the call date),
                                   then we will pay the call price to you
                                   in cash. If we notify you that we will
                                   give you cash on the call date, you will
                                   no longer be able to exercise your
                                   exchange right.

                                   If, however, parity as so determined is
                                   equal to or greater than the call price,
                                   then we will deliver the shares of MCI
                                   WorldCom Stock instead. In that case,
                                   you will still have the right to
                                   exercise your exchange right on any day
                                   prior to the call date.

                                   Price of MCI WorldCom Stock

MCI WorldCom Stock is              The last reported sales price on the New
currently $93.75 a share           York Stock Exchange of MCI WorldCom
                                   Stock on the date of this Pricing
                                   Supplement was $93.75. You can review
                                   the publicly-reported prices of MCI
                                   WorldCom Stock for the last three years
                                   in the "Historical Information" section
                                   of this Pricing Supplement.

                                   The Calculation Agent
                                   
                                   We have appointed MS & Co. to act as
                                   calculation agent for The Chase
                                   Manhattan Bank, the trustee for our
                                   senior notes. As calculation agent, MS &
                                   Co. will determine the exchange ratio
                                   and calculate the amount of MCI WorldCom
                                   Stock or cash that you receive if you
                                   exercise your exchange right or if we
                                   call the notes. As calculation agent, MS
                                   & Co. will also adjust the exchange
                                   ratio for certain corporate events that
                                   could affect the price of the MCI
                                   WorldCom Stock and that we describe in
                                   the section called "Description of
                                   Notes--Antidilution Adjustments" in this
                                   Pricing Supplement.

                                   No Affiliation with MCI WorldCom

                                   MCI WorldCom is not an affiliate of ours
                                   and is not involved with this offering
                                   in any way. The notes are obligations of
                                   Morgan Stanley Dean Witter & Co. and not
                                   of MCI WorldCom.

                                    PS-4
<PAGE>




                                   More Information on the Notes


                                   The notes are senior notes issued as
                                   part of our Series C medium-term note
                                   program. You can find a general
                                   description of our Series C medium-term
                                   note program in the accompanying
                                   Prospectus Supplement dated March 26,
                                   1998. We describe the basic features of
                                   this type of note in the sections called
                                   "Description of Notes--Fixed Rate Notes"
                                   and "--Exchangeable Notes."

                                   Because this is a summary, it does not
                                   contain all of the information that may
                                   be important to you, including the
                                   specific requirements for the exercise
                                   of your exchange right and of our call
                                   right. You should read the "Description
                                   of Notes" section in this Pricing
                                   Supplement. You should also read about
                                   some of the risks involved in investing
                                   in the notes in the section called "Risk
                                   Factors."

                                   How to reach us

                                   You may contact Morgan Stanley Dean
                                   Witter & Co. at our principal executive
                                   offices at 1585 Broadway, New York, New
                                   York 10036 (telephone number (212)
                                   761-4000).




                                    PS-5

<PAGE>



                                RISK FACTORS

     The notes are not secured and are riskier ordinary debt securities. This
section describes the most significant risks relating to the notes. You should
carefully consider whether the notes are suited to your particular circumstances
before you decide to purchase them.


Yield to Maturity Less Than        These notes have a yield to maturity of
Interest on Ordinary Notes         0.25% per year based on the issue price
                                   of $982.85 and computed on a semi-annual
                                   bond-equivalent basis. This yield to
                                   maturity is lower than the rate of
                                   interest that we would pay on
                                   non-exchangeable senior notes maturing
                                   at the same time as the notes. If you
                                   exchange your notes for MCI WorldCom
                                   Stock, you will not receive accrued
                                   original issue discount.

Notes May Not Be                   There may be little or no secondary
Actively Traded                    market for the notes. Although the notes
                                   have been approved for listing on the
                                   New York Stock Exchange, Inc., it is not
                                   possible to predict whether the notes
                                   will trade in the secondary market. Even
                                   if there is a secondary market, it may
                                   not provide enough liquidity to allow
                                   you to trade or sell the notes easily.
                                   MS & Co. currently intends to act as a
                                   market maker for the notes, but is not
                                   required to do so.

Market Price of Notes              Several factors, many of which are
Influenced by Many                 beyond our control, will influence the
Unpredictable Factors              value of the notes, including:

                                   o  the market price of MCI WorldCom Stock

                                   o  the volatility (frequency and
                                      magnitude of changes in price) of the
                                      MCI WorldCom Stock

                                   o  the dividend rate on the MCI WorldCom
                                      Stock

                                   o  economic, financial, political
                                      and regulatory or judicial events that
                                      affect stock markets generally and which
                                      may affect the market price of the MCI
                                      WorldCom Stock

                                   o  interest and yield rates in the market

                                   o  the time remaining until (1) you can
                                      exchange your notes for stock, (2) we
                                      can call the notes and (3) the notes
                                      mature

                                   o  our creditworthiness

                                   These factors will influence the price
                                   that you will receive if you sell your
                                   notes prior to maturity. For example,
                                   you may have to sell your notes at a
                                   substantial discount from the issue
                                   price if the market price of the MCI
                                   WorldCom Stock is at, below or not
                                   sufficiently above the price of MCI
                                   WorldCom Stock at pricing.

                                   You cannot predict the future
                                   performance of MCI WorldCom Stock based
                                   on its historical performance.




                                    PS-6

<PAGE>



No Affiliation with                We are not affiliated with MCI WorldCom.
MCI WorldCom                       We do not have any non-public
                                   information about MCI WorldCom as of the
                                   date of this Pricing Supplement,
                                   although we or our affiliates may
                                   presently or from time to time engage in
                                   business with MCI WorldCom, including
                                   extending loans to, or making equity
                                   investments in, MCI WorldCom or
                                   providing investment advisory services
                                   to MCI WorldCom, including merger and
                                   acquisition advisory services. Moreover,
                                   we have no ability to control or predict
                                   the actions of MCI WorldCom, including
                                   any corporate actions of the type that
                                   would require the calculation agent to
                                   adjust the exchange ratio. MCI WorldCom
                                   is not involved in the offering of the
                                   notes in any way and has no obligation
                                   to consider your interest as a holder of
                                   these notes in taking any corporate
                                   actions that might affect the value of
                                   your notes. None of the money you pay
                                   for the notes will go to MCI WorldCom.

You Have No                        As a holder of notes, you will not have
Shareholder Rights                 voting rights or the right to receive
                                   dividends or other distributions or any
                                   other rights with respect to MCI
                                   WorldCom Stock.

Limited Antidilution               MS & Co., as calculation agent, will
Adjustments                        adjust the exchange ratio for certain
                                   events affecting the MCI WorldCom Stock,
                                   such as stock splits and stock
                                   dividends, and certain other corporate
                                   actions involving MCI WorldCom, such as
                                   mergers. However, the calculation agent
                                   is not required to make an adjustment
                                   for every corporate event that can
                                   affect MCI WorldCom Stock. For example,
                                   the calculation agent is not required to
                                   make any adjustments if MCI WorldCom or
                                   anyone else makes a partial tender offer
                                   or a partial exchange offer for MCI
                                   WorldCom Stock. If an event occurs that
                                   does not require the calculation agent
                                   to adjust the exchange rate, the market
                                   price of the notes may be materially and
                                   adversely affected. In addition, the
                                   Calculation Agent may in good faith
                                   adjust the exchange ratio for corporate
                                   events other than those contemplated in
                                   this Pricing Supplement if it determines
                                   that it is appropriate. Such adjustments
                                   will be made to reflect the consequences
                                   of events but not with the aim of
                                   changing investment risk. Adjustments
                                   may materially and adversely affect the
                                   market price of the notes.

Potential Conflicts of             As calculation agent, MS & Co. will
Interest between You and           calculate how many shares of MCI
the Calculation Agent and          WorldCom Stock you will receive in
Other Affiliates of Ours           exchange for your notes and what
                                   adjustments should be made to the
                                   exchange ratio to reflect certain
                                   corporate and other events. MS & Co. and
                                   other affiliates may carry out hedging
                                   activities related to the notes,
                                   including trading in MCI WorldCom Stock
                                   as well as in other instruments related
                                   to MCI WorldCom Stock. MS & Co. and some
                                   of our subsidiaries also trade MCI
                                   WorldCom Stock on a regular basis as
                                   part of their general broker-dealer
                                   businesses. Any of these activities and
                                   MS & Co.'s affiliation with us could
                                   influence MS & Co.'s determinations as
                                   calculation agent, including with
                                   respect to adjustments to the exchange
                                   ratio, and, accordingly, the amount of
                                   stock or cash that you receive when you
                                   exchange the notes or when we call the
                                   notes. In addition, such trading
                                   activity could potentially affect the
                                   price of MCI WorldCom Stock and,
                                   thereby, the value of the MCI WorldCom
                                   Stock or cash you will receive upon
                                   exchange or redemption.




                                    PS-7

<PAGE>




Tax Treatment                      You should also consider the tax
                                   consequences of investing in the notes.
                                   If you are a U.S. taxable investor, you
                                   will be subject to annual income tax
                                   based on the comparable yield of the
                                   notes, even though you will not receive
                                   any periodic interest payments and at
                                   maturity may only receive the return of
                                   the principal amount of the notes. In
                                   addition, any gain recognized by U.S.
                                   taxable investors on the sale, exchange
                                   or retirement of the notes will be
                                   treated as ordinary income. Please read
                                   carefully the section "Description of
                                   Notes--United States Federal Taxation"
                                   in this Pricing Supplement.




                                    PS-8

<PAGE>



                            DESCRIPTION OF NOTES

     Capitalized terms not defined herein have the meanings given to such terms
in the accompanying Prospectus Supplement. In this Pricing Supplement, the
"Company," "we," "us" and "our" refer to Morgan Stanley Dean Witter & Co.

Principal Amount...............    $16,005,000

Maturity Date..................    March 2, 2006

Specified Currency.............    U.S. Dollars

Issue Price....................    $982.85 (98.285% of the
                                   principal amount at maturity)

Stated OID.....................    0.25% per annum computed on a
                                   semi-annual bond-equivalent basis

Original Issue Date
(Settlement Date)..............    March 30, 1999

CUSIP..........................    617446DH9

Minimum Denominations..........    $1,000

Initial MCI WorldCom Price.....    $93.75 per share

Exchange Right.................    On any Exchange Date, you will be
                                   entitled upon (i) your completion and
                                   delivery to us and the Calculation Agent
                                   of an Official Notice of Exchange (in
                                   the form of Annex A attached hereto)
                                   prior to 11:00 a.m. New York City time
                                   on such date and (ii) delivery on such
                                   date of such notes to the Trustee, to
                                   exchange each $1,000 principal amount of
                                   the Exchangeable Notes Due March 2, 2006
                                   (Exchangeable for Shares of Common Stock
                                   of MCI WorldCom, Inc.) (the "Notes") for
                                   9.25 shares (the "Exchange Ratio") of
                                   MCI WorldCom Stock, subject to
                                   adjustment as described under
                                   "--Antidilution Adjustments" below. You
                                   will not, however, be entitled to
                                   exchange your Notes if we have
                                   previously called the Notes for the cash
                                   Call Price as described under "--Company
                                   Call Right" below.

                                   Upon any such exchange, we may, at our
                                   sole option, either deliver such shares
                                   of MCI WorldCom Stock or pay an amount
                                   in cash equal to the Exchange Ratio
                                   times the Market Price of MCI WorldCom
                                   Stock on the Exchange Date, as
                                   determined by the Calculation Agent, in
                                   lieu of such shares. Such delivery or
                                   payment will be made 3 Business Days
                                   after any Exchange Date, subject to
                                   delivery of such Notes to the Trustee on
                                   the Exchange Date.

                                   Upon any exercise of the Exchange Right,
                                   you will not be entitled to receive any
                                   cash payment representing any accrued
                                   Stated OID. Such accrued Stated OID will
                                   be deemed paid by the MCI WorldCom Stock
                                   or cash received by you upon exercise of
                                   the Exchange Right.




                                    PS-9

<PAGE>



                                   We will, or will cause the Calculation
                                   Agent to, deliver such shares of MCI
                                   WorldCom Stock or cash to the Trustee
                                   for delivery to you.

No Fractional Shares .........     If upon any exchange of the Notes we
                                   deliver shares of MCI WorldCom Stock, we
                                   will pay cash in lieu of delivering
                                   fractional shares of MCI WorldCom Stock
                                   in an amount equal to the corresponding
                                   fractional Market Price of MCI WorldCom
                                   Stock as determined by the Calculation
                                   Agent on such Exchange Date.

Exchange Ratio ...............     9.25, subject to adjustment for certain
                                   corporate events relating to MCI
                                   WorldCom, Inc. See "--Antidilution
                                   Adjustments" below.

Exchange Date.................     Any Trading Day that falls during the
                                   period beginning May 25, 1999 and ending
                                   on the day prior to the earliest of (i)
                                   the Maturity Date, (ii) the Call Date
                                   and (iii) in the event of a call for the
                                   cash Call Price as described under
                                   "--Company Call Right" below, the
                                   Company Notice Date.

Company Call Right ...........     On or after February 25, 2002, we may
                                   call the Notes, in whole but not in
                                   part, for mandatory exchange into MCI
                                   WorldCom Stock at the Exchange Ratio;
                                   provided that, if Parity on the Trading
                                   Day immediately preceding the Company
                                   Notice Date, as determined by the
                                   Calculation Agent, is less than the
                                   applicable Call Price for the Call Date
                                   specified in our Notice of mandatory
                                   exchange, we will (under those
                                   circumstances only) pay such applicable
                                   Call Price in cash on the Call Date. If
                                   we call the Notes for mandatory
                                   exchange, then, unless you subsequently
                                   exercise the Exchange Right (the
                                   exercise of which will not be available
                                   to you following a call for cash in an
                                   amount equal to the Call Price), the MCI
                                   WorldCom Stock or (in the event of a
                                   call for cash, as described above) cash
                                   to be delivered to you will be delivered
                                   on the Call Date fixed by us and set
                                   forth in our notice of mandatory
                                   exchange, upon delivery of your Notes to
                                   the Trustee. We will, or will cause the
                                   Calculation Agent to, deliver such
                                   shares of MCI WorldCom Stock or cash to
                                   the Trustee for delivery to you.

                                   Upon an exchange by us (whether payment
                                   is to be made in MCI WorldCom Stock or
                                   by payment of the cash Call Price, as
                                   applicable), you will not receive any
                                   additional cash payment representing any
                                   accrued Stated OID. Such accrued Stated
                                   OID will be deemed paid by the delivery
                                   of MCI WorldCom Stock or cash.

                                   On or after the Company Notice Date
                                   (other than with respect to a call of
                                   the Notes for the cash Call Price by the
                                   Company) you will continue to be
                                   entitled to exercise the Exchange Right
                                   and receive any amounts described under
                                   "--Exchange Right" above.

Company Notice Date...........     The scheduled Trading Day on which we
                                   issue our notice of mandatory exchange,
                                   which must be at least 30 but no more
                                   than 60 days prior to the Call Date.




                                    PS-10

<PAGE>



Call Date.....................     The scheduled Trading Day on or after
                                   February 25, 2002 specified by us in our
                                   notice of mandatory exchange on which we
                                   will deliver MCI WorldCom Stock or cash
                                   to holders of the Notes for mandatory
                                   exchange.

Parity........................     With respect to any Trading Day, an
                                   amount equal to the Exchange Ratio times
                                   the Market Price (as defined below) of
                                   MCI WorldCom Stock on such Trading Day.

Call Price....................     The table below shows indicative Call
                                   Prices for each $1,000 principal amount
                                   of Notes on February 25, 2002 and at
                                   each February 25 thereafter to and
                                   including the Maturity Date. The Call
                                   Price for each $1,000 principal amount
                                   of Notes called for mandatory exchange
                                   on Call Dates between such indicative
                                   dates would include an additional amount
                                   reflecting Stated OID accrued from the
                                   next preceding date in the table through
                                   the applicable Call Date at a rate of
                                   0.25% per annum. Such additional
                                   accreted amount of Stated OID will be
                                   determined by the Calculation Agent and
                                   will be calculated on a semiannual
                                   bond-equivalent basis based on the Call
                                   Price for the immediately preceding Call
                                   Date indicated in the table below.

                                   Call Date                      Call Price
                                   ---------                      ----------
                                   February 25, 2002...........   $   990.01
                                   February 25, 2003...........   $   992.48
                                   February 25, 2004...........   $   994.97
                                   February 25, 2005...........   $   997.46
                                   Maturity...................... $ 1,000.00

Market Price..................     If MCI WorldCom Stock (or any other
                                   security for which a Market Price must
                                   be determined) is listed on a U.S.
                                   securities exchange registered under the
                                   Securities Exchange Act of 1934, as
                                   amended (the "Exchange Act"), is a
                                   security of The Nasdaq National Market
                                   ("NASDAQ NMS") or is included in the OTC
                                   Bulletin Board Service ("OTC Bulletin
                                   Board") operated by the National
                                   Association of Securities Dealers, Inc.
                                   (the "NASD"), the Market Price for one
                                   share of MCI WorldCom Stock (or one unit
                                   of any such other security) on any
                                   Trading Day means (i) the last reported
                                   sale price, regular way, on such day on
                                   the principal securities exchange on
                                   which MCI WorldCom Stock (or any such
                                   other security) is listed or admitted to
                                   trading or (ii) if not listed or
                                   admitted to trading on any such
                                   securities exchange or if such last
                                   reported sale price is not obtainable,
                                   the last reported sale price on the
                                   over-the-counter market as reported on
                                   the NASDAQ NMS or OTC Bulletin Board on
                                   such day. If the last reported sale
                                   price is not available pursuant to
                                   clause (i) or (ii) of the preceding
                                   sentence, the Market Price for any
                                   Trading Day shall be the mean, as
                                   determined by the Calculation Agent, of
                                   the bid prices for MCI WorldCom Stock
                                   (or any such other security) obtained
                                   from as many dealers in such security
                                   (which may include MS & Co. or any of
                                   our other subsidiaries or affiliates),
                                   but not exceeding three, as will make
                                   such bid prices available to the
                                   Calculation Agent. A "security of the



                                   PS-11

<PAGE>



                                   NASDAQ NMS" shall include a security
                                   included in any successor to such system
                                   and the term "OTC Bulletin Board
                                   Service" shall include any successor
                                   service thereto.

Trading Day...................     A day, as determined by the Calculation
                                   Agent, on which trading is generally
                                   conducted on the New York Stock
                                   Exchange, Inc. ("NYSE"), the American
                                   Stock Exchange, Inc., the NASDAQ NMS,
                                   the Chicago Mercantile Exchange, the
                                   Chicago Board of Options Exchange and in
                                   the over-the-counter market for equity
                                   securities in the United States and on
                                   which a Market Disruption Event has not
                                   occurred.

Book Entry Note or
Certificated Note.............     Book Entry, DTC

Senior Note or Subordinated
Note..........................     Senior

Trustee.......................     The Chase Manhattan Bank

Agent for this Underwritten
Offering of Notes.............     Morgan Stanley & Co. Incorporated and
                                   its successors (MS & Co.)

Calculation Agent.............     Morgan Stanley & Co. Incorporated and
                                   its successors (MS & Co.)

                                   All determinations made by the
                                   Calculation Agent will be at the sole
                                   discretion of the Calculation Agent and
                                   will, in the absence of manifest error,
                                   be conclusive for all purposes and
                                   binding on you and on us.

                                   Because the Calculation Agent is our
                                   affiliate, potential conflicts of
                                   interest may exist between the
                                   Calculation Agent and you as a holder of
                                   the Notes, including with respect to
                                   certain determinations and judgments
                                   that the Calculation Agent must make in
                                   making adjustments to the Exchange Ratio
                                   or determining the Market Price or
                                   whether a Market Disruption Event has
                                   occurred. See "Antidilution Adjustments"
                                   and "Market Disruption Event" below. MS
                                   & Co. is obligated to carry out its
                                   duties and functions as Calculation
                                   Agent in good faith and using its
                                   reasonable judgment.

Antidilution Adjustments......     The Exchange Ratio will be adjusted as
                                   follows:

                                   1. If MCI WorldCom Stock is subject to a
                                   stock split or reverse stock split, then
                                   once such split has become effective,
                                   the Exchange Ratio will be adjusted to
                                   equal the product of the prior Exchange
                                   Ratio and the number of shares issued in
                                   such stock split or reverse stock split
                                   with respect to one share of MCI
                                   WorldCom Stock.

                                   2. If MCI WorldCom Stock is subject (i)
                                   to a stock dividend (issuance of
                                   additional shares of MCI WorldCom Stock)
                                   that is given ratably to all holders of
                                   shares of MCI WorldCom Stock or (ii) to
                                   a distribution of MCI WorldCom Stock as
                                   a result of the triggering of any
                                   provision of the corporate charter of
                                   MCI WorldCom, then once the dividend has
                                   become effective and MCI WorldCom Stock is



                                   PS-12

<PAGE>



                                   trading ex-dividend, the Exchange Ratio
                                   will be adjusted so that the new
                                   Exchange Ratio shall equal the prior
                                   Exchange Ratio plus the product of (i)
                                   the number of shares issued with respect
                                   to one share of MCI WorldCom Stock and
                                   (ii) the prior Exchange Ratio.

                                   3. There will be no adjustments to the
                                   Exchange Ratio to reflect cash dividends
                                   or other distributions paid with respect
                                   to MCI WorldCom Stock other than
                                   distributions described in paragraph 6
                                   below and Extraordinary Dividends as
                                   described below. A cash dividend or
                                   other distribution with respect to MCI
                                   WorldCom Stock will be deemed to be an
                                   "Extraordinary Dividend" if such
                                   dividend or other distribution exceeds
                                   the immediately preceding non-
                                   Extraordinary Dividend for MCI WorldCom
                                   Stock (as adjusted for any subsequent
                                   corporate event requiring an adjustment
                                   hereunder, such as a stock split or
                                   reverse stock split) by an amount equal
                                   to at least 10% of the Market Price of
                                   MCI WorldCom Stock on the Trading Day
                                   preceding the ex-dividend date for the
                                   payment of such Extraordinary Dividend
                                   (the "ex-dividend date"). If an
                                   Extraordinary Dividend occurs with
                                   respect to MCI WorldCom Stock, the
                                   Exchange Ratio with respect to MCI
                                   WorldCom Stock will be adjusted on the
                                   ex-dividend date with respect to such
                                   Extraordinary Dividend so that the new
                                   Exchange Ratio will equal the product of
                                   (i) the then current Exchange Ratio and
                                   (ii) a fraction, the numerator of which
                                   is the Market Price on the Trading Day
                                   preceding the ex-dividend date, and the
                                   denominator of which is the amount by
                                   which the Market Price on the Trading
                                   Day preceding the ex-dividend date
                                   exceeds the Extraordinary Dividend
                                   Amount. The "Extraordinary Dividend
                                   Amount" with respect to an Extraordinary
                                   Dividend for MCI WorldCom Stock will
                                   equal (i) in the case of cash dividends
                                   or other distributions that constitute
                                   quarterly dividends, the amount per
                                   share of such Extraordinary Dividend
                                   minus the amount per share of the
                                   immediately preceding non-Extraordinary
                                   Dividend for MCI WorldCom Stock or (ii)
                                   in the case of cash dividends or other
                                   distributions that do not constitute
                                   quarterly dividends, the amount per
                                   share of such Extraordinary Dividend. To
                                   the extent an Extraordinary Dividend is
                                   not paid in cash, the value of the
                                   non-cash component will be determined by
                                   the Calculation Agent, whose
                                   determination shall be conclusive. A
                                   distribution on the MCI WorldCom Stock
                                   described in paragraph 6 below that also
                                   constitutes an Extraordinary Dividend
                                   shall only cause an adjustment to the
                                   Exchange Ratio pursuant to paragraph 6.

                                   4. If MCI WorldCom is being liquidated
                                   or is subject to a proceeding under any
                                   applicable bankruptcy, insolvency or
                                   other similar law, the Notes will
                                   continue to be exchangeable into MCI
                                   WorldCom Stock so long as a Market Price
                                   for MCI WorldCom Stock is available. If
                                   a Market Price is no longer available
                                   for MCI WorldCom Stock for whatever
                                   reason, including the liquidation of MCI
                                   WorldCom or the subjection of MCI
                                   WorldCom to a proceeding under any
                                   applicable bankruptcy, insolvency or
                                   other similar law, then the value of MCI
                                   WorldCom Stock will equal zero for so
                                   long as no Market Price is available.



                                   PS-13

<PAGE>



                                   5. If there occurs any reclassification
                                   or change of MCI WorldCom Stock, or if
                                   MCI WorldCom has been subject to a
                                   merger, combination or consolidation and
                                   is not the surviving entity, or if there
                                   occurs a sale or conveyance to another
                                   corporation of the property and assets
                                   of MCI WorldCom as an entirety or
                                   substantially as an entirety, in each
                                   case as a result of which the holders of
                                   MCI WorldCom Stock shall be entitled to
                                   receive stock, other securities or other
                                   property or assets (including, without
                                   limitation, cash or other classes of
                                   stock of MCI WorldCom) ("Exchange
                                   Property") with respect to or in
                                   exchange for such MCI WorldCom Stock,
                                   then the holders of the Notes then
                                   outstanding will be entitled thereafter
                                   to exchange such Notes into the kind and
                                   amount of Exchange Property that they
                                   would have owned or been entitled to
                                   receive upon such reclassification,
                                   change, merger, combination,
                                   consolidation, sale or conveyance had
                                   such holders exchanged such Notes for
                                   MCI WorldCom Stock immediately prior to
                                   any such corporate event, but without
                                   interest thereon. At such time, no
                                   adjustment will be made to the Exchange
                                   Ratio.

                                   6. If MCI WorldCom issues to all of its
                                   shareholders equity securities of an
                                   issuer other than MCI WorldCom (other
                                   than in a transaction described in
                                   paragraph 5 above), then the holders of
                                   the Notes then outstanding will be
                                   entitled to receive such new equity
                                   securities upon exchange of such Notes.
                                   The Exchange Ratio for such new equity
                                   securities will equal the product of the
                                   Exchange Ratio in effect for MCI
                                   WorldCom Stock at the time of the
                                   issuance of such new equity securities
                                   times the number of shares of the new
                                   equity securities issued with respect to
                                   one share of MCI WorldCom Stock.

                                   7. No adjustments to the Exchange Ratio
                                   will be required other than those
                                   specified above. However, we may, at our
                                   sole discretion, cause the Calculation
                                   Agent to make additional changes to the
                                   Exchange Ratio to reflect changes
                                   occurring in relation to the MCI
                                   WorldCom Stock (or other Exchange
                                   Property) in other circumstances where
                                   we determine in good faith that it is
                                   appropriate, but only to reflect such
                                   changes, and not with the aim of
                                   spreading investment risk.

                                   No adjustments to the Exchange Ratio
                                   will be required unless such adjustment
                                   would require a change of at least 0.1%
                                   in the Exchange Ratio then in effect.
                                   The Exchange Ratio resulting from any of
                                   the adjustments specified above will be
                                   rounded to the nearest one
                                   hundred-thousandth with five
                                   one-millionths being rounded upward.

                                   The Exchange Ratio will not be adjusted
                                   to take into account the accrual of
                                   Stated OID.

                                   The Calculation Agent shall be solely
                                   responsible for the determination and
                                   calculation of any adjustments to the
                                   Exchange Ratio and of any related
                                   determinations and calculations with
                                   respect to any distributions of stock,
                                   other securities or other property or



                                   PS-14

<PAGE>



                                   assets (including cash) in connection
                                   with any corporate event described in
                                   paragraph 5 or 6 above, and its
                                   determinations and calculations with
                                   respect thereto shall be conclusive.

                                   The Calculation Agent will provide
                                   information as to any adjustments to the
                                   Exchange Ratio upon written request by
                                   any holder of the Notes.

Market Disruption Event.......     "Market Disruption Event" means, with
                                   respect to MCI WorldCom Stock:

                                        (i) a suspension, absence or material
                                        limitation of trading of MCI WorldCom
                                        Stock on the primary market for MCI
                                        WorldCom Stock for more than two hours
                                        of trading or during the one-half hour
                                        period preceding the close of trading in
                                        such market; or a breakdown or failure
                                        in the price and trade reporting systems
                                        of the primary market for MCI WorldCom
                                        Stock as a result of which the reported
                                        trading prices for MCI WorldCom Stock
                                        during the last one-half hour preceding
                                        the closing of trading in such market
                                        are materially inaccurate; or the
                                        suspension, absence or material
                                        limitation on the primary market for
                                        trading in options contracts related to
                                        MCI WorldCom Stock, if available, during
                                        the one-half hour period preceding the
                                        close of trading in the applicable
                                        market, in each case as determined by
                                        the Calculation Agent in its sole
                                        discretion; and

                                        (ii) a determination by the Calculation
                                        Agent in its sole discretion that the
                                        event described in clause (i) above
                                        materially interfered with the ability
                                        of the Company or any of our affiliates
                                        to unwind all or a material portion of
                                        the hedge with respect to the Notes.
                                         
                                   For purposes of determining whether a
                                   Market Disruption Event has occurred:
                                   (1) a limitation on the hours or number
                                   of days of trading will not constitute a
                                   Market Disruption Event if it results
                                   from an announced change in the regular
                                   business hours of the relevant exchange,
                                   (2) a decision to permanently
                                   discontinue trading in the relevant
                                   option contract will not constitute a
                                   Market Disruption Event, (3) limitations
                                   pursuant to New York Stock Exchange Rule
                                   80A (or any applicable rule or
                                   regulation enacted or promulgated by the
                                   NYSE, any other self-regulatory
                                   organization or the Securities and
                                   Exchange Commission of similar scope as
                                   determined by the Calculation Agent) on
                                   trading during significant market
                                   fluctuations shall constitute a
                                   suspension, absence or material
                                   limitation of trading, (4) a suspension
                                   of trading in an options contract on MCI
                                   WorldCom Stock by the primary securities
                                   market trading in such options, if
                                   available, by reason of (x) a price
                                   change exceeding limits set by such
                                   securities exchange or market, (y) an
                                   imbalance of orders relating to such
                                   contracts or (z) a disparity in bid and
                                   ask quotes relating to such contracts
                                   will constitute a suspension, absence or
                                   material limitation of trading in
                                   options contracts related to MCI



                                   PS-15

<PAGE>



                                   WorldCom Stock and (5) a suspension,
                                   absence or material limitation of
                                   trading on the primary securities market
                                   on which options contracts related to
                                   MCI WorldCom Stock are traded will not
                                   include any time when such securities
                                   market is itself closed for trading
                                   under ordinary circumstances.

Alternate Exchange
Calculation in case of an
Event of Default..............     In case an Event of Default with respect
                                   to the Notes shall have occurred and be 
                                   continuing, the amount declared due and 
                                   payable upon any acceleration of any
                                   Note shall be determined by MS & Co., as
                                   Calculation Agent, and shall be equal to
                                   the Issue Price of a Note plus the
                                   accrued Stated OID to but not including
                                   the date of acceleration; provided that
                                   if (x) the holder of a Note has
                                   submitted an Official Notice of Exchange
                                   to the Company in accordance with the
                                   Exchange Right or (y) the Company has
                                   called the Notes, other than a call for
                                   the cash Call Price, in accordance with
                                   the Company Call Right, the amount
                                   declared due and payable upon any such
                                   acceleration shall be an amount in cash
                                   for each $1,000 principal amount of a
                                   Note equal to the Exchange Ratio times
                                   the Market Price of one share of MCI
                                   WorldCom Stock, determined by the
                                   Calculation Agent as of the Exchange
                                   Date or as of the date of acceleration,
                                   respectively, and shall not include any
                                   accrued Stated OID thereon; provided
                                   further that if the Issuer has called
                                   the Notes for cash in an amount equal to
                                   the Call Price, in accordance with the
                                   Company Call Right, the amount declared
                                   due and payable upon any such
                                   acceleration shall be an amount in cash
                                   for each $1,000 principal amount of a
                                   Note equal to the applicable Call Price.
                                   See "--Call Price" above.

MCI WorldCom Stock;
Public Information............     MCI WorldCom is one of the largest
                                   telecommunications companies in the
                                   United States, serving local, long
                                   distance and Internet customers
                                   domestically and internationally. MCI
                                   WorldCom Stock is registered under the
                                   Exchange Act. Companies with securities
                                   registered under the Exchange Act are
                                   required to file periodically certain
                                   financial and other information
                                   specified by the Securities and Exchange
                                   Commission (the "Commission").
                                   Information provided to or filed with
                                   the Commission can be inspected and
                                   copied at the public reference
                                   facilities maintained by the Commission
                                   at Room 1024, 450 Fifth Street, N.W.,
                                   Washington, D.C. 20549 or at its
                                   Regional Offices located at Suite 1400,
                                   Citicorp Center, 500 West Madison
                                   Street, Chicago, Illinois 60661 and at
                                   Seven World Trade Center, 13th Floor,
                                   New York, New York 10048, and copies of
                                   such material can be obtained from the
                                   Public Reference Section of the
                                   Commission, 450 Fifth Street, N.W.,
                                   Washington, D.C. 20549, at prescribed
                                   rates. In addition, information provided
                                   to or filed with the Commission
                                   electronically can be accessed through a
                                   Website maintained by the Commission.
                                   The address of the Commission's Website
                                   is http://www.sec.gov. Information
                                   provided to or filed with the Commission
                                   by MCI WorldCom pursuant to the Exchange
                                   Act of 1934 can be located by reference
                                   to Commission file number 0-11258. In
                                   addition,



                                   PS-16

<PAGE>



                                   information regarding MCI WorldCom may
                                   be obtained from other sources
                                   including, but not limited to, press
                                   releases, newspaper articles and other
                                   publicly disseminated documents. We make
                                   no representation or warranty as to the
                                   accuracy or completeness of such
                                   reports.

                                   This pricing supplement relates only to
                                   the Notes offered hereby and does not
                                   relate to MCI WorldCom Stock or other
                                   securities of MCI WorldCom. We have
                                   derived all disclosures contained in
                                   this pricing supplement regarding MCI
                                   WorldCom from the publicly available
                                   documents described in the preceding
                                   paragraph. Neither we nor the Agent has
                                   participated in the preparation of such
                                   documents or made any due diligence
                                   inquiry with respect to MCI WorldCom in
                                   connection with the offering of the
                                   Notes. Neither we nor the Agent makes
                                   any representation that such publicly
                                   available documents or any other
                                   publicly available information regarding
                                   MCI WorldCom are accurate or complete.
                                   Furthermore, we cannot give any
                                   assurance that all events occurring
                                   prior to the date hereof (including
                                   events that would affect the accuracy or
                                   completeness of the publicly available
                                   documents described in the preceding
                                   paragraph) that would affect the trading
                                   price of MCI WorldCom Stock (and
                                   therefore the Initial MCI WorldCom Price
                                   and the Exchange Ratio) have been
                                   publicly disclosed. Subsequent
                                   disclosure of any such events or the
                                   disclosure of or failure to disclose
                                   material future events concerning MCI
                                   WorldCom could affect the value received
                                   on any Exchange Date or Call Date with
                                   respect to the Notes and therefore the
                                   trading prices of the Notes.

                                   Neither we nor any of our affiliates
                                   makes any representation to you as to
                                   the performance of MCI WorldCom Stock.

                                   We or our affiliates may presently or
                                   from time to time engage in business
                                   with MCI WorldCom, including extending
                                   loans to, or making equity investments
                                   in, MCI WorldCom or providing advisory
                                   services to MCI WorldCom, including
                                   merger and acquisition advisory
                                   services. In the course of such
                                   business, we or our affiliates may
                                   acquire non-public information with
                                   respect to MCI WorldCom and, in
                                   addition, one or more of our affiliates
                                   may publish research reports with
                                   respect to MCI WorldCom. The statement
                                   in the preceding sentence is not
                                   intended to affect the rights of holders
                                   of the Notes under the securities laws.
                                   As a prospective purchaser of a Note,
                                   you should undertake such independent
                                   investigation of MCI WorldCom as in your
                                   judgment is appropriate to make an
                                   informed decision with respect to an
                                   investment in MCI WorldCom Stock.

Historical Information........     The following table sets forth the
                                   published high and low Market Price
                                   during 1996, 1997, 1998 and during 1999
                                   through March 18, 1999. The Market Price
                                   on March 18, 1999 was $93.75. We
                                   obtained the Market Prices listed below
                                   from Bloomberg Financial



                                   PS-17

<PAGE>



                                   Markets and we believe such information
                                   to be accurate. You should not take the
                                   historical prices of MCI WorldCom Stock
                                   as an indication of future performance.
                                   We cannot give any assurance that the
                                   price of MCI WorldCom Stock will
                                   increase sufficiently to cause the
                                   beneficial owners of the Notes to
                                   receive an amount in excess of the
                                   principal amount on any Exchange Date or
                                   Call Date.

                                   MCI WorldCom             High       Low
                                   ------------             ----       ---
                                   (CUSIP 55268B106)
                                   1996
                                   First Quarter.........    23         16 1/2
                                   Second Quarter........    27 11/16   21 3/4
                                   Third Quarter.........    28         18 5/8
                                   Fourth Quarter........    26 1/16    21 5/8
                                   1997
                                   First Quarter.........    27 1/2     22
                                   Second Quarter........    32         21 7/8
                                   Third Quarter.........    37         29 15/16
                                   Fourth Quarter........    38 1/16    28 15/16
                                   1998
                                   First Quarter.........    44 7/16    28 13/16
                                   Second Quarter........    48 7/16    42 1/4
                                   Third Quarter.........    56 7/8     40 15/16
                                   Fourth Quarter........    74 1/4     43 1/8
                                   1999
                                   First Quarter (through
                                    March 18, 1999)......    93 3/4     69 7/8


                                   Historical prices have been adjusted for
                                   a 2 for 1 stock split of MCI WorldCom
                                   Stock, which became effective in the
                                   third quarter of 1996.

                                   MCI WorldCom has not paid cash dividends
                                   on the MCI WorldCom Stock to date. We
                                   make no representation as to the amount
                                   of dividends, if any, that MCI WorldCom
                                   will pay in the future. In any event, as
                                   a holder of a Note, you will not be
                                   entitled to receive dividends, if any,
                                   that may be payable on MCI WorldCom
                                   Stock.

Use of Proceeds and Hedging...     The net proceeds we receive from the sale
                                   of the Notes will be used for general
                                   corporate purposes and, in part, by us
                                   or one or more of our affiliates in
                                   connection with hedging our obligations
                                   under the Notes. See also "Use of
                                   Proceeds" in the accompanying
                                   Prospectus.

                                   On or prior to the date of this Pricing
                                   Supplement, we, through our subsidiaries
                                   and others, hedged our anticipated
                                   exposure in connection with the Notes by
                                   taking positions in MCI WorldCom Stock
                                   and positions in other instruments in
                                   connection with such hedging. Such
                                   hedging was carried out in a manner
                                   designed to minimize any impact on the
                                   price of MCI WorldCom Stock. Our
                                   purchase activity could potentially have
                                   increased the price of MCI WorldCom
                                   Stock, and therefore effectively have
                                   increased the level to which MCI
                                   WorldCom Stock must rise before you
                                   would receive an amount of MCI WorldCom
                                   Stock worth as much or more than the



                                   PS-18

<PAGE>



                                   accreted principal amount of your Notes
                                   on any Exchange Date or Call Date.
                                   Through our subsidiaries, we are likely
                                   to modify our hedge position throughout
                                   the life of the Notes by purchasing and
                                   selling MCI WorldCom Stock, options
                                   contracts on MCI WorldCom Stock listed
                                   on major securities markets or positions
                                   in other securities or instruments that
                                   we may wish to use in connection with
                                   such hedging. Although we have no reason
                                   to believe that our hedging activity or
                                   other trading activities that we, or any
                                   of our affiliates, engaged in or may
                                   engage in has had or will have a
                                   material impact on the price of MCI
                                   WorldCom Stock, we cannot give any
                                   assurance that we have not or will not
                                   affect such price as a result of our
                                   hedging or trading activities.

Supplemental Information           
Concerning Plan of                 
Distribution..................     In order to facilitate the offering of
                                   the Notes, the Agent may engage in
                                   transactions that stabilize, maintain or
                                   otherwise affect the price of the Notes
                                   or the MCI WorldCom Stock. Specifically,
                                   the Agent may overallot in connection
                                   with the offering, creating a short
                                   position in the Notes for its own
                                   account. In addition, to cover
                                   allotments or to stabilize the price of
                                   the Notes, the Agent may bid for, and
                                   purchase, the Notes or the MCI WorldCom
                                   Stock in the open market. See "Use of
                                   Proceeds and Hedging" above.

                                   We have agreed to indemnify the Agent
                                   against certain liabilities under the
                                   Securities Act of 1933, as amended.

ERISA Matters for Pension          
Plans And Insurance                
Companies.....................     We and certain of our affiliates, 
                                   including MS & Co. and Dean Witter
                                   Reynolds Inc. ("DWR"), may each be
                                   considered a "party in interest" within
                                   the meaning of the Employee Retirement
                                   Income Security Act of 1974, as amended
                                   ("ERISA"), or a "disqualified person"
                                   within the meaning of the Internal
                                   Revenue Code of 1986, as amended (the
                                   "Code") with respect to many employee
                                   benefit plans. Prohibited transactions
                                   within the meaning of ERISA or the Code
                                   may arise, for example, if the Notes are
                                   acquired by or with the assets of a
                                   pension or other employee benefit plan
                                   with respect to which MS & Co., DWR or
                                   any of their affiliates is a service
                                   provider, unless the Notes are acquired
                                   pursuant to an exemption from the
                                   prohibited transaction rules.

                                   The acquisition of the Notes may be
                                   eligible for one of the exemptions noted
                                   below if such acquisition:

                                   (a) (i) is made solely with the assets
                                   of a bank collective investment fund and
                                   (ii) satisfies the requirements and
                                   conditions of Prohibited Transaction
                                   Class Exemption ("PTCE") 91-38 issued by
                                   the Department of Labor ("DOL");

                                   (b) (i) is made solely with assets of an
                                   insurance company pooled separate
                                   account and (ii) satisfies the
                                   requirements and conditions of PTCE 90-1
                                   issued by the DOL;




                                   PS-19

<PAGE>



                                   (c) (i) is made solely with assets
                                   managed by a qualified professional
                                   asset manager and (ii) satisfies the
                                   requirements and conditions of PTCE
                                   84-14 issued by the DOL;

                                   (d) is made solely with assets of a
                                   governmental plan (as defined in Section
                                   3(32) of ERISA) which is not subject to
                                   the provisions of Section 401 of the
                                   Code;

                                   (e) (i) is made solely with assets of an
                                   insurance company general account and
                                   (ii) satisfies the requirements and
                                   conditions of PTCE 95-60 issued by the
                                   DOL; or

                                   (f) (i) is made solely with assets
                                   managed by an in-house asset manager and
                                   (ii) satisfies the requirements and
                                   conditions of PTCE 96-23 issued by the
                                   DOL.

                                   Under ERISA, assets of a pension or
                                   other employee benefit plan may include
                                   assets held in the general account of an
                                   insurance company which has issued an
                                   insurance policy to such plan or assets
                                   of an entity in which the plan has
                                   invested. In addition, employee benefit
                                   plans subject to ERISA (or insurance
                                   companies deemed to be investing ERISA
                                   plan assets) purchasing the Notes should
                                   consider the possible implications of
                                   owning the MCI WorldCom Stock. Thus, any
                                   insurance company, pension or employee
                                   benefit plan or entity holding assets of
                                   such a plan proposing to invest in the
                                   Notes should consult with its legal
                                   counsel prior to such investment.

United States Federal              
Taxation......................     The Notes are Optionally Exchangeable
                                   Notes and investors should refer to the
                                   discussion under "United States Federal
                                   Taxation--Notes--Optionally Exchangeable
                                   Notes" in the accompanying Prospectus
                                   Supplement. In connection with the
                                   discussion thereunder, we have
                                   determined that the "comparable yield"
                                   is an annual rate of 5.93%, compounded
                                   semi-annually. Based on our
                                   determination of the comparable yield,
                                   the "projected payment schedule" for a
                                   Note (assuming a par amount of $1,000 or
                                   with respect to each integral multiple
                                   thereof) consists of a projected amount
                                   due at maturity, equal to $1,472.85.

                                   The comparable yield and the projected
                                   payment schedule are not provided for
                                   any purpose other than the determination
                                   of United States Holders' interest
                                   accruals and adjustments in respect of
                                   the Notes, and we make no representation
                                   regarding the actual amounts of the
                                   payments on a Note.

                                   In addition, the effective date of the
                                   New Regulations (as defined in "United
                                   States Federal Taxation -- Backup
                                   Withholding" in the accompanying
                                   Prospectus Supplement) has been changed
                                   so that the New Regulations will apply
                                   to payments made after December 31,
                                   1999.




                                   PS-20

<PAGE>


                                                                        ANNEX A

                        OFFICIAL NOTICE OF EXCHANGE

                                               Dated: [On or after May 25, 1999]

Morgan Stanley Dean Witter & Co.
1585 Broadway
New York, New York 10036

Morgan Stanley & Co. Incorporated, as
  Calculation Agent
1585 Broadway
New York, New York 10036
Fax No.: (212) 761-0674
(Attn: Lily Lam)

Dear Sirs:

     The undersigned holder of the Medium Term Notes, Series C, Senior Fixed
Rate Notes, Exchangeable Notes due March 2, 2006 (Exchangeable for Shares of
Common Stock of MCI WorldCom, Inc.) of Morgan Stanley Dean Witter & Co. (CUSIP
No. 617446DH9) (the "Notes") hereby irrevocably elects to exercise with respect
to the principal amount of the Notes indicated below, as of the date hereof (or,
if this letter is received after 11:00 a.m. on any Trading Day, as of the next
Trading Day), provided that such day is prior to the earliest of (i) March 2,
2006, (ii) the Call Date and (iii) in the event of a call for cash, the Company
Notice Date, the Exchange Right as described in Pricing Supplement No. 64 dated
March 18, 1999 (the "Pricing Supplement") to the Prospectus Supplement dated
March 26, 1998 and the Prospectus dated March 26, 1998 related to Registration
Statement No. 333-46935. Capitalized terms not defined herein have the meanings
given to such terms in the Pricing Supplement. Please date and acknowledge
receipt of this notice in the place provided below on the date of receipt, and
fax a copy to the fax number indicated, whereupon the Company will deliver, at
its sole option, shares of the Common Stock of MCI WorldCom, Inc. or cash 3
Business Days after the Exchange Date in accordance with the terms of the Notes,
as described in the Pricing Supplement.

                                         Very truly yours,


                                         --------------------------------------
                                         [Name of Holder]


                                         By:
                                            -----------------------------------
                                            [Title]


                                         --------------------------------------
                                         [Fax No.]


                                         $
                                          -------------------------------------
                                         Principal Amount of Notes surrendered
                                           for exchange
Receipt of the above Official
Notice of Exchange is hereby
acknowledged

MORGAN STANLEY DEAN WITTER & CO., as Issuer

MORGAN STANLEY & CO. INCORPORATED, as Calculation Agent

By MORGAN STANLEY & CO. INCORPORATED, as Calculation Agent


By:
   -------------------------------------------------
   Title:

Date and time of acknowledgment
                               ---------------------




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