MORGAN STANLEY DEAN WITTER & CO
424B3, 1999-03-02
FINANCE SERVICES
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PROSPECTUS Dated March 26, 1998                   Pricing Supplement No. 58 to
PROSPECTUS SUPPLEMENT                     Registration Statement No. 333-46935
Dated March 26, 1998                                   Dated February 25, 1999
                                                                Rule 424(b)(3)


                                  $39,575,000
                       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 $982.66 (98.266% 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 $982.66 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 ZR06."

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 98.266% PER NOTE

                                   ----------

<TABLE>
<CAPTION>
              Price to Public    Agent's Commissions    Proceeds to Company
              ---------------    -------------------    -------------------
<S>           <C>                <C>                    <C>
Per Note.         98.266%               0.25%                 98.016%
Total.....    $38,888,769.50         $98,937.50           $38,789,832.00
</TABLE>

                           MORGAN STANLEY DEAN WITTER

                     (This page intentionally left blank)



                         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 $982.66       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 $982.66 (98.266% 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 $982.66
                              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 each
is 9.25                       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 business
cash or MCI WorldCom          days after you give us your Official Notice of
Stock if you elect to         Exchange, either:
exchange your notes
                              o shares of MCI WorldCom Stock, or

                              o the cash value of such shares.

                              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 of our
stock or cash, depending on   call notice, the calculation agent will determine
the price of MCI WorldCom     the value of the shares of MCI WorldCom Stock
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 $982.66 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 York 
currently $85.875 a share     Stock Exchange of MCI WorldCom Stock on the date 
                              of this Pricing Supplement was $85.875.  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.

                              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).



                                 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 $982.66 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 beyond
Influenced by Many                    our control, will influence the value of
Unpredictable Factors                 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 $85.875.

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

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 WorldCom
the Calculation Agent and             Stock you will receive in exchange for
Other Affiliates of Ours              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.

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.




                             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..............  $39,575,000

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

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

Issue Price...................  $982.66 (98.266% 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 2, 1999

CUSIP.........................  617446DG1

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

Initial MCI WorldCom Price....  $85.875 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.

                                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.

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.

                                <TABLE>
                                <S>                             <C>
                                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
                                </TABLE>


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 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 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.

                                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
                                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 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, 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 February 25, 1999.
                                The Market Price on February 25, 1999 was
                                $85.875.  We obtained the Market Prices listed
                                below from Bloomberg Financial 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.


                                <TABLE>
                                <CAPTION>
                                            MCI WorldCom                High        Low
                                            ------------                ----        ---
                                (CUSIP 55268B106)
                                <S>                                     <C>         <C>
                                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 February 25, 1999).......      85 7/8      69 7/8
                                </TABLE>


                                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 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;

                                (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 5.96%, 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 $1,482.33.

                                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.


                                                                       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. 617446DG1) (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. 58 dated February 25, 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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