MORGAN STANLEY DEAN WITTER & CO
424B3, 1999-05-19
FINANCE SERVICES
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PROSPECTUS Dated May 5, 1999                       Pricing Supplement No. 6 to
PROSPECTUS SUPPLEMENT                     Registration Statement No. 333-75289
Dated May 6, 1999                                           Dated May 14, 1999
                                                                Rule 424(b)(3)


                                $31,750,000
                     Morgan Stanley Dean Witter & Co.
                        MEDIUM-TERM NOTES, SERIES C
                          Senior Fixed Rate Notes

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

                    Exchangeable Notes due May 30, 2006
                Exchangeable for Shares of Common Stock of
                          SUN MICROSYSTEMS, 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 August 14, 1999, you will
be able to exchange your notes for a number of shares of Sun Microsystems
common stock, subject to our right to call all of the notes on or after May
19, 2001.

o   The price of each note is $982.59 (98.259% 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 August 14, 1999, you will have the right to exchange each Note
    for 12.09176 shares of Sun Microsystems 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 May 19, 2001, 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 $982.59 plus accrued original issue discount, or OID, to the call
    date.  However, if the market value of 12.09176 shares of Sun Microsystems
    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 12.09176
    shares of Sun Microsystems 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 Sun Microsystems 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   Sun Microsystems is not involved in this offering of the notes in any way
    and will have no financial obligation with respect to the notes.

o   We will apply to list the notes to trade under the proposed symbol "MSSUNW
    ZR06" on the New York Stock Exchange, Inc., but it is not possible to
    predict whether the notes will meet the NYSE listing requirements.

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 98.259%
                                -----------------


              Price to Public    Agent's Commissions    Proceeds to Company
              ---------------    -------------------    -------------------
Per Note....      98.259%               0.25%                 98.009%
Total.......  $31,197,232.50         $79,375.00           $31,117,857.50


                           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 $982.59         We, Morgan Stanley Dean Witter & Co., are
                                offering you Exchangeable Notes due May 30,
                                2006, which you may exchange for Sun
                                Microsystems, Inc. common stock ("Sun
                                Microsystems Stock") beginning on August 14,
                                1999. The price of each note is $982.59 (98.259%
                                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 May 30, 2006, we
                                will pay you $1,000 per note. This payment
                                represents the $982.59 issue price plus a yield
                                to maturity of 0.25% per year compounded
                                semi-annually.

                                Your Exchange Right

The exchange ratio              Beginning August 14, 1999, you may exchange each
is 12.09176                     note for a number of shares of Sun Microsystems
                                Stock equal to the exchange ratio. The exchange
                                ratio is 12.09176 shares of Sun Microsystems
                                Stock per note, subject to adjustment for
                                certain corporate events relating to Sun
                                Microsystems, Inc. ("Sun Microsystems"). 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 cash   We will pay you, at our option, within 3
or Sun Microsystems Stock if    business days after you give us your Official
you elect to exchange your      Notice of Exchange, either:
notes
                                o  shares of Sun Microsystems 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 May 19, 2001, 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
                                   Sun Microsystems 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        call notice, the calculation agent will
on the price of                 determine the value of the shares of Sun
Sun Microsystems Stock          Microsystems 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
                                $982.59 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 Sun Microsystems Stock
                                instead. In that case, you will still have the
                                right to exercise your exchange right on any day
                                prior to the call date.

Sun Microsystems Stock is       The last reported sales price on the New York
currently $64 5/8 a share       Stock Exchange of Sun Microsystems Stock on the
                                date of this Pricing Supplement was $64(5)/(8).
                                You can review the publicly-reported prices of
                                Sun Microsystems 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 Sun Microsystems 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 Sun Microsystems
                                Stock and that we describe in the section called
                                "Description of Notes--Antidilution Adjustments"
                                in this Pricing Supplement.

No Affilation with              Sun Microsystems is not an affiliate of ours and
Sun Microsystems                is not involved with this offering in any way.
                                The notes are obligations of Morgan Stanley Dean
                                Witter & Co. and not of Sun Microsystems.

More Information                The notes are senior notes issued as part of
on the Notes                    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 0.25%
Interest on Ordinary Notes      per year based on the issue price of $982.59 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 Sun
                                Microsystems Stock, you will not receive accrued
                                original issue discount.

Notes May Not Be                There may be little or no secondary market for
Actively Traded                 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 our
Influenced by Many              control, will influence the value of the notes,
Unpredictable Factors           including:

                                o  the market price of Sun Microsystems Stock

                                o  the volatility (frequency and magnitude of
                                   changes in price) of the Sun Microsystems
                                   Stock

                                o  the dividend rate on the Sun Microsystems
                                   Stock

                                o  economic, financial, political and regulatory
                                   or judicial events that affect stock markets
                                   generally and which may affect the market
                                   price of the Sun Microsystems 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 Sun
                                Microsystems Stock is at, below or not
                                sufficiently above the price of Sun Microsystems
                                Stock at pricing.

                                You cannot predict the future performance of Sun
                                Microsystems Stock based on its historical
                                performance.

No Affiliation with             We are not affiliated with Sun Microsystems.
Sun Microsystems                We do not have any non-public information about
                                Sun Microsystems as of the date of this Pricing
                                Supplement, although we or our affiliates may
                                presently or from time to time engage in
                                business with Sun Microsystems, including
                                extending loans to, or making equity investments
                                in, Sun Microsystems or providing investment
                                advisory services to Sun Microsystems, including
                                merger and acquisition advisory services.
                                Moreover, we have no ability to control or
                                predict the actions of Sun Microsystems,
                                including any corporate actions of the type that
                                would require the calculation agent to adjust
                                the exchange ratio. Sun Microsystems 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 Sun Microsystems.


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

Limited Antidilution            MS & Co., as calculation agent, will adjust the
Adjustments                     exchange ratio for certain events affecting the
                                Sun Microsystems Stock, such as stock splits and
                                stock dividends, and certain other corporate
                                actions involving Sun Microsystems, such as
                                mergers. However, the calculation agent is not
                                required to make an adjustment for every
                                corporate event that can affect Sun Microsystems
                                Stock. For example, the calculation agent is not
                                required to make any adjustments if Sun
                                Microsystems or anyone else makes a partial
                                tender offer or a partial exchange offer for Sun
                                Microsystems 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, but is not
                                required to, make adjustments for corporate
                                events that can affect the Sun Microsystems
                                Stock other than those contemplated in this
                                pricing supplement. Such adjustments will be
                                made to reflect the consequences of events but
                                not with the aim of changing relative investment
                                risk. The determination by the calculation agent
                                to adjust, or not to adjust, the exchange ratio
                                may materially and adversely affect the market
                                price of the notes.

Potential Conflicts of          As calculation agent, MS & Co. will calculate
Interest between You and        how many shares of Sun Microsystems Stock you
the Calculation Agent and       will receive in exchange for your notes and what
Other Affiliates of Ours        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 Sun Microsystems Stock as
                                well as in other instruments related to Sun
                                Microsystems Stock. MS & Co. and some of our
                                subsidiaries also trade Sun Microsystems 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
                                Sun Microsystems Stock and, thereby, the value
                                of the Sun Microsystems 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..............   $31,750,000

Maturity Date.................   May 30, 2006

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

Issue Price...................   $982.59 (98.259% 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).............   May 19, 1999

CUSIP.........................   617446DJ5

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

Initial Sun Microsystems Price   $64 5/8 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 May 30, 2006
                                 (Exchangeable for Shares of Common Stock of
                                 Sun Microsystems, Inc.) (the "Notes") for
                                 12.09176 shares (the "Exchange Ratio") of Sun
                                 Microsystems 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 Sun
                                 Microsystems Stock or pay an amount in cash
                                 equal to the Exchange Ratio times the Market
                                 Price of Sun Microsystems 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 Sun Microsystems 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 Sun Microsystems
                                 Stock or cash to the Trustee for delivery to
                                 you.

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

Exchange Ratio ...............   12.09176, subject to adjustment for certain
                                 corporate events relating to Sun
                                 Microsystems, Inc.  See "--Antidilution
                                 Adjustments" below.

Exchange Date.................   Any Trading Day that falls during the period
                                 beginning August 14, 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 May 19, 2001, we may call the
                                 Notes, in whole but not in part, for
                                 mandatory exchange into Sun Microsystems
                                 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 Sun Microsystems
                                 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
                                 Sun Microsystems Stock or cash to the Trustee
                                 for delivery to you.

                                 Upon an exchange by us (whether payment is to
                                 be made in Sun Microsystems 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 Sun
                                 Microsystems 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 May 19,
                                 2001 specified by us in our notice of
                                 mandatory exchange on which we will deliver
                                 Sun Microsystems 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 Sun Microsystems
                                 Stock on such Trading Day.

Call Price....................   The table below shows indicative Call Prices
                                 for each $1,000 principal amount of Notes on
                                 May 19, 2001 and at each May 19 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
                                   ---------                       ----------
                                   May 19, 2001.................    $  987.51
                                   May 19, 2002.................    $  989.98
                                   May 19, 2003.................    $  992.46
                                   May 19, 2004.................    $  994.94
                                   May 19, 2005.................    $  997.43
                                   May 19, 2006.................    $  999.93
                                   Maturity.....................    $1,000.00

Market Price..................   If Sun Microsystems 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
                                 Sun Microsystems 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 Sun Microsystems 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 Sun Microsystems 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 Sun Microsystems 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 Sun
                                 Microsystems Stock.

                                 2. If Sun Microsystems Stock is subject (i)
                                 to a stock dividend (issuance of additional
                                 shares of Sun Microsystems Stock) that is
                                 given ratably to all holders of shares of Sun
                                 Microsystems Stock or (ii) to a distribution
                                 of Sun Microsystems Stock as a result of the
                                 triggering of any provision of the corporate
                                 charter of Sun Microsystems, then once the
                                 dividend has become effective and Sun
                                 Microsystems 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 Sun Microsystems 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 Sun
                                 Microsystems Stock other than distributions
                                 described in paragraph 6 below and
                                 Extraordinary Dividends as described below. A
                                 cash dividend or other distribution with
                                 respect to Sun Microsystems Stock will be
                                 deemed to be an "Extraordinary Dividend" if
                                 such dividend or other distribution exceeds the
                                 immediately preceding non-Extraordinary
                                 Dividend for Sun Microsystems 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 Sun Microsystems 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 Sun
                                 Microsystems Stock, the Exchange Ratio with
                                 respect to Sun Microsystems 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 Sun Microsystems
                                 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 Sun
                                 Microsystems 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 Sun Microsystems 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 Sun Microsystems 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 Sun Microsystems Stock so
                                 long as a Market Price for Sun Microsystems
                                 Stock is available.  If a Market Price is no
                                 longer available for Sun Microsystems Stock
                                 for whatever reason, including the liquidation
                                 of Sun Microsystems or the subjection of Sun
                                 Microsystems to a proceeding under any
                                 applicable bankruptcy, insolvency or other
                                 similar law, then the value of Sun
                                 Microsystems Stock will equal zero for so
                                 long as no Market Price is available.

                                 5. If there occurs any reclassification or
                                 change of Sun Microsystems Stock, including,
                                 without limitation, as a result of the
                                 issuance of tracking stock by Sun
                                 Microsystems, or if Sun Microsystems 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 Sun Microsystems as an
                                 entirety or substantially as an entirety, in
                                 each case as a result of which the holders of
                                 Sun Microsystems Stock shall be entitled to
                                 receive stock, other securities or other
                                 property or assets (including, without
                                 limitation, cash or other classes of stock of
                                 Sun Microsystems) ("Exchange Property") with
                                 respect to or in exchange for such Sun
                                 Microsystems 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 Sun Microsystems 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 Sun Microsystems issues to all of its
                                 shareholders equity securities of an issuer
                                 other than Sun Microsystems (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 Sun
                                 Microsystems 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 Sun Microsystems 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 upon
                                 the occurrence of corporate or other similar
                                 events that affect or could potentially
                                 affect market prices of, or sharesholders'
                                 rights in, the Sun Microsystems Stock (or
                                 other Exchange Property) but only to reflect
                                 such changes, and not with the aim of
                                 changing relative 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 Sun Microsystems Stock:

                                    (i) a suspension, absence or material
                                    limitation of trading of Sun Microsystems
                                    Stock on the primary market for Sun
                                    Microsystems 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 Sun Microsystems
                                    Stock as a result of which the reported
                                    trading prices for Sun Microsystems 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 Sun Microsystems
                                    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 Sun
                                 Microsystems 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 Sun Microsystems Stock
                                 and (5) a suspension, absence or material
                                 limitation of trading on the primary
                                 securities market on which options contracts
                                 related to Sun Microsystems 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 Sun
                                 Microsystems 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.

Sun Microsystems Stock;
Public Information............   Sun Microsystems is a leading supplier of
                                 enterprise network computing products
                                 including desktop systems, servers, storage
                                 subsystems, network switches, software,
                                 microprocessors, and a full range of services
                                 and support.  Sun Microsystems 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
                                 Sun Microsystems pursuant to the Exchange Act
                                 of 1934 can be located by reference to
                                 Commission file number 0-15086.  In addition,
                                 information regarding Sun Microsystems 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
                                 Sun Microsystems Stock or other securities
                                 of Sun Microsystems.  We have derived all
                                 disclosures contained in this pricing
                                 supplement regarding Sun Microsystems 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 Sun Microsystems 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 Sun Microsystems 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 Sun Microsystems Stock
                                 (and therefore the Initial Sun Microsystems
                                 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 Sun Microsystems 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 Sun Microsystems Stock.

                                 We or our affiliates may presently or from
                                 time to time engage in business with Sun
                                 Microsystems, including extending loans to, or
                                 making equity investments in, Sun
                                 Microsystems or providing advisory services
                                 to Sun Microsystems, including merger and
                                 acquisition advisory services.  In the course
                                 of such business, we or our affiliates may
                                 acquire non-public information with respect
                                 to Sun Microsystems and, in addition, one or
                                 more of our affiliates may publish research
                                 reports with respect to Sun Microsystems.  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
                                 Sun Microsystems as in your judgment is
                                 appropriate to make an informed decision with
                                 respect to an investment in Sun Microsystems
                                 Stock.

Historical Information........   The following table sets forth the published
                                 high and low Market Price during 1996, 1997,
                                 1998 and during 1999 through May 14, 1999.
                                 The Market Price on May 14, 1999 was
                                 $64(5)/(8).  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 Sun Microsystems Stock as an
                                 indication of future performance.  We cannot
                                 give any assurance that the price of Sun
                                 Microsystems 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

                                 Sun Microsystems            High         Low
                                 ----------------            ----         ---
                         (CUSIP 866810104)
                         1996
                         First Quarter....................  14 1/32     9 11/32
                         Second Quarter...................  16 21/32   11 13/32
                         Third Quarter....................  16 1/4     11 31/32
                         Fourth Quarter...................  17 1/2     12 27/32
                         1997
                         First Quarter....................  17 1/2      13 5/32
                         Second Quarter...................  18 31/32    13 7/16
                         Third Quarter....................  26 21/32    18 9/32
                         Fourth Quarter...................  23 3/8      15 7/8
                         1998
                         First Quarter....................  24 15/16    18 57/64
                         Second Quarter...................  22 9/16     19 13/32
                         Third Quarter....................  26 3/8      19 13/16
                         Fourth Quarter...................  43 7/16     20
                         1999
                         First Quarter....................  62 31/32    44 27/32
                         Second Quarter
                           (through May 14, 1999).........  71 1/2      50 1/8


                                 Historical prices have been adjusted for two
                                 2 for 1 stock splits of Sun Microsystems
                                 Stock, which became effective in the fourth
                                 quarter of 1996 and the second quarter of
                                 1999, respectively.

                                 We make no representation as to the amount of
                                 dividends, if any, that Sun Microsystems 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 Sun Microsystems 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 Sun Microsystems 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 Sun Microsystems Stock.  Our
                                 purchase activity could potentially have
                                 increased the price of Sun Microsystems
                                 Stock, and therefore effectively have
                                 increased the level to which Sun Microsystems
                                 Stock must rise before you would receive an
                                 amount of Sun Microsystems 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 Sun Microsystems
                                 Stock, options contracts on Sun Microsystems
                                 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 Sun Microsystems 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 Sun Microsystems
                                 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 Sun Microsystems
                                 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 Sun
                                 Microsystems 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 6.18%, 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 $1507.34.

                                 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.

                                                                         ANNEX A

                           OFFICIAL NOTICE OF EXCHANGE

                                            Dated: [On or after August 14, 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 May 30, 2006 (Exchangeable for Shares of
Common Stock of Sun Microsystems, Inc.) of Morgan Stanley Dean Witter & Co.
(CUSIP No. 617446DJ5) (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)
May 30, 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. 6
dated May 14, 1999 (the "Pricing Supplement") to the Prospectus Supplement dated
May 6, 1999 and the Prospectus dated May 5, 1999 related to Registration
Statement No. 333-75289. 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 Sun Microsystems, 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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