MORGAN STANLEY DEAN WITTER & CO
424B3, 1999-12-13
FINANCE SERVICES
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PROSPECTUS Dated May 5, 1999                        Pricing Supplement No. 30 to
PROSPECTUS SUPPLEMENT                       Registration Statement No. 333-75289
Dated May 6, 1999                                         Dated December 8, 1999
                                                                  Rule 424(b)(3)

                                   $65,000,000
                        Morgan Stanley Dean Witter & Co.
                           MEDIUM-TERM NOTES, SERIES C
                             Senior Fixed Rate Notes

                                   -----------

                 0.50% Exchangeable Notes due December 13, 2004
                   Exchangeable for Shares of Common Stock of
                                 Three Companies

                                   -----------

Beginning January 13, 2000, you will be able to exchange your notes for a
basket of shares of the common stock of three companies, which we refer to as
the basket stocks, subject to our right to call all of the notes on or after
December 13, 2001.

o   The principal amount and issue price of each note is $1,000.

o   We will pay interest at the rate of 0.50% per year on the $1,000 principal
    amount of each note. Interest will be paid semi- annually on each June 13
    and December 13, beginning June 13, 2000.

o   The basket consists of a fixed number of shares of each basket stock, which
    we refer to as the exchange ratio. The exchange ratio for each basket stock
    is calculated so that the value of that basket stock is an equally-weighted
    percentage of the initial basket value at the time we priced the notes on
    December 8, 1999. The exchange ratio of any basket stock will remain
    constant for the term of the notes unless adjusted for certain corporate
    events. The initial basket value is $855.615, based on the market prices of
    the basket stocks at the time we priced the notes on December 8, 1999.

o   Beginning January 13, 2000, you will have the right to exchange each note
    for the number of shares of each of the basket stocks as provided by the
    exchange ratio for that basket stock. If you exchange, we will have the
    right to deliver to you either the actual shares of the basket stocks or the
    cash value of such shares. You will not be entitled to any accrued but
    unpaid interest.

o   Beginning December 13, 2001, we have the right to call all of the notes and
    pay to you the call price of $1,000. However, if the sum of the products of
    the market price of each basket stock and its exchange ratio 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 shares of each basket stock equal to its
    exchange ratio 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 the basket stocks 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 $1,000 per note to you.

o   The issuers of the basket stocks are 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 notes on the American Stock Exchange, Inc., subject to
    official notice of issuance. The AMEX symbol for the notes is "YEC.A."

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 100%
                                 ---------------

              Price to Public    Agent's Commissions    Proceeds to Company
              ---------------    -------------------    -------------------
Per Note....       100%                 0.25%                 99.75%
Total.......    $65,000,000           $162,500              $64,837,500


                           MORGAN STANLEY DEAN WITTER

<PAGE>

                      (This page intentionally left blank)




                                      PS-2

<PAGE>


                          SUMMARY OF PRICING SUPPLEMENT

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



                            The Notes

Each note costs $1,000      We, Morgan Stanley Dean Witter & Co., are offering
                            you 0.50% Exchangeable Notes due December 13, 2004,
                            which you may exchange for a basket of shares of
                            common stock of three companies beginning on January
                            13, 2000. We refer to the shares of common stock of
                            the three companies as the basket stocks. The
                            principal amount and issue price of each note is
                            $1,000. If you hold the notes to maturity, which is
                            December 13, 2004, we will pay $1,000 per note to
                            you.

0.50% interest on the       We will pay interest on the notes, at the rate of
principal amount            0.50% of the principal amount per year,
                            semi-annually on each June 13 and December 13,
                            beginning June 13, 2000.

                            Your Exchange Right

The initial basket          Beginning January 13, 2000, you may exchange each
value is $855.615           note for a number of shares of each basket stock
                            equal to its exchange ratio. The exchange ratio for
                            each basket stock is calculated so that the value of
                            that basket stock is an equally-weighted percentage
                            of the initial basket value at the time we priced
                            the notes on December 8, 1999. The exchange ratio
                            with respect to each basket stock will remain
                            constant for the term of the notes unless adjusted
                            for certain corporate events relating to the issuer
                            of that basket stock. The initial basket value is
                            $855.615, based on the market prices of the basket
                            stocks at the time we priced the notes on December
                            8, 1999.

                            When you exchange your notes, Morgan Stanley & Co.
                            Incorporated or its successors, which we refer to as
                            MS & Co., acting as calculation agent, will
                            determine the exact number of shares of each of the
                            basket stocks you will receive based on the
                            principal amount of the notes you exchange and the
                            exchange ratio of each basket stock 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.

                                      PS-3

<PAGE>


                            If you give us your Official Notice of Exchange
                            after 11:00 a.m. (New York City time) on any day or
                            at any time 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 to     We will pay to you, at our option, within 3 business
you cash or shares          days after you give us your Official Notice of
if you elect to exchange    Exchange, either:
your notes
                            o shares of the basket stocks, or

                            o the cash value of such shares.

                            We will not pay any accrued but unpaid interest 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 December 13, 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
                                each basket stock or the cash call price that we
                                will pay to you in exchange for each note, as
                                explained in the next paragraph.

We may call the notes       On the last trading day before the date of our call
for stock or cash,          notice, the calculation agent will determine the
depending on the price      aggregate value of the shares of the basket stocks
of the basket stocks        that a noteholder would receive upon exchange of a
                            note. The sum of those values is referred to as the
                            basket value. If the basket value is less than the
                            call price of $1,000, 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, the basket value as so determined is
                            equal to or greater than the call price, then we
                            will deliver the shares of the basket stocks instead
                            on the call date. In that case, you will still have
                            the right to exercise your exchange right on any day
                            prior to the call date.

Basket Stocks               The following table sets forth the basket stocks,
                            the ticker symbol of each basket stock on the New
                            York Stock Exchange, Inc., the percentage of the
                            initial basket value represented by each basket
                            stock, the initial market price of each basket stock
                            at the time we priced the notes on December 8, 1999,
                            the exchange ratio of each basket stock and the
                            initial value of the aggregate shares of each basket
                            stock contained in the basket at that time:

                                       Percent
                                     Represented    Initial
                                      in Initial     Stock   Exchange    Initial
Issuer of Basket Stock      Ticker   Basket Value    Price     Ratio      Value
- ----------------------      ------   ------------    -----     -----      -----
Citigroup Inc.............     C       33.333%     $56.7938   5.02177   $285.205
EMC Corporation...........    EMC      33.333%     $94.7933   3.00871   $285.205
Tyco International Ltd....    TYC      33.333%     $35.9172   7.94062   $285.205

                                      PS-4

<PAGE>


                            The exchange ratio of each basket stock indicates
                            the number of shares of such basket stock, given the
                            market price of the basket stock, required to be
                            included in the calculation of the initial basket
                            value so that each basket stock represents an
                            equally-weighted percentage of the initial basket
                            value. The exchange ratios will remain constant for
                            the term of the notes unless adjusted for certain
                            corporate events. See "Adjustments to the Exchange
                            Ratios and the Basket."


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
                            number of shares of basket stocks 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 basket
                            stocks and that we describe in the section called
                            "Description of Notes--Adjustments to the Exchange
                            Ratios and the Basket" in this pricing supplement.


No Affiliation with         The issuers of the basket stocks are not affiliates
the Issuers of the          of ours and are not involved with this offering in
Basket Stocks               any way. The notes are obligations of Morgan Stanley
                            Dean Witter & Co. and not of the issuers of the
                            basket stocks.

More Information            The notes are senior notes issued as part of our
on the Notes                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 May 6, 1999. 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 for a detailed description
                            of the terms of the notes. You should also read
                            about some of the risks involved in investing in the
                            notes in the section called "Risk Factors." We urge
                            you to consult with your investment, legal,
                            accounting and other advisors with regards to any
                            investment in the notes.

How to reach us             You may contact us at our principal executive
                            offices at 1585 Broadway, New York, New York 10036
                            (telephone number (212) 761-4000).

                                      PS-5

<PAGE>


                                  RISK FACTORS

               The notes are not secured debt and are riskier than 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 pay interest at the rate of
Interest on Ordinary Notes         0.50% of the principal amount per year. This
                                   interest rate is lower than the interest rate
                                   that we would pay on non-exchangeable senior
                                   notes maturing at the same time as the notes.
                                   If you exchange your notes for the basket
                                   stocks, you will not receive any accrued but
                                   unpaid interest.

Notes May Not Be                   There may be little or no secondary market
Actively Traded                    for the notes. Although we will apply to list
                                   the notes on the American Stock Exchange,
                                   Inc., the listing has not been approved. 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
Unpredictable Factors              notes, including:

                                   o   the market price of the basket stocks

                                   o   the volatility (frequency and magnitude
                                       of changes in price) of each of the
                                       basket stocks

                                   o   the dividend rate on the basket stocks

                                   o   economic, financial, political and
                                       regulatory or judicial events that affect
                                       stock markets generally and which may
                                       affect the market price of any one of the
                                       basket stocks or of the basket as a whole

                                   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 prices of
                                   the basket stocks are at, below or not
                                   sufficiently above the price of the basket
                                   stocks at pricing.

                                   You cannot predict the future performance of
                                   any of the basket stocks or of the basket as
                                   a whole based on their historical
                                   performance.

                                      PS-6

<PAGE>


No Affiliation with                We are not affiliated with any of the issuers
the Issuers of the Basket          of the basket stocks. We or our subsidiaries
Stocks                             may presently or from time to time engage in
                                   business with one or more of the issuers of
                                   the basket stocks, including extending loans
                                   to, entering into loans with, or making
                                   equity investments in, one or more of the
                                   issuers of the basket stocks or their
                                   affiliates or subsidiaries or providing
                                   underwriting or investment advisory services
                                   to one or more of the issuers of the basket
                                   stocks, including merger and acquisition
                                   advisory services. In the course of our
                                   business, we or our affiliates may acquire
                                   non-public information about one or more of
                                   the issuers of the basket stocks. Moreover,
                                   we have no ability to control or predict the
                                   actions of the issuers of the basket stocks,
                                   including any corporate actions of the type
                                   that would require the calculation agent to
                                   adjust the exchange ratio. We or our
                                   affiliates from time to time have published
                                   and in the future may publish research
                                   reports with respect to the basket stocks.
                                   The basket was compiled independently of any
                                   research recommendations and may not be
                                   consistent with such recommendations. The
                                   issuers of the basket stocks are not involved
                                   in the offering of the notes in any way and
                                   have no obligation to consider your interest
                                   as an owner 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 the issuers of the
                                   basket stocks.

You Have No                        As an owner 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 the basket stocks.

Limited Adjustments                MS & Co., as calculation agent, will adjust
                                   any of the exchange ratios for certain events
                                   affecting the basket stocks, such as stock
                                   splits and stock dividends, and certain other
                                   corporate actions involving the issuers of
                                   the basket stocks, such as mergers. However,
                                   the calculation agent is not required to make
                                   an adjustment for every corporate event that
                                   can affect the basket stocks. For example,
                                   the calculation agent is not required to make
                                   any adjustments if the issuers of the basket
                                   stocks or anyone else makes a partial tender
                                   offer or a partial exchange offer for any
                                   basket 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
                                   basket stocks other than those contemplated
                                   in this pricing supplement. Such adjustments
                                   will be made to reflect the consequences of
                                   those corporate 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 ratios
                                   may materially and adversely affect the
                                   market price of the notes.

                                      PS-7

<PAGE>



Potential Conflicts of             As calculation agent, MS & Co. will calculate
Interest between You               the basket value, how many shares of the
and the Calculation                basket stocks you will receive in exchange
Agent and Other                    for your notes and what adjustments should be
Affiliates of Ours                 made to the exchange ratios to reflect
                                   certain corporate and other events. MS & Co.
                                   and other affiliates may carry out hedging
                                   activities related to the notes or to other
                                   instruments, including trading in the basket
                                   stocks as well as in other instruments
                                   related to the basket stocks. MS & Co. and
                                   some of our subsidiaries also trade the
                                   basket stocks on a regular basis as part of
                                   their general broker-dealer businesses. We or
                                   our subsidiaries may issue other securities
                                   linked to the basket stocks. 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 ratios, 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 the basket stocks and, thereby, the
                                   value of the basket stocks 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, which will be higher than
                                   the 0.50% interest rate you will receive on
                                   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 and the section
                                   "United States Federal
                                   Taxation--Notes--Optionally Exchangeable
                                   Notes" in the accompanying prospectus
                                   supplement.

                                      PS-8

<PAGE>


                              DESCRIPTION OF NOTES

     Terms not defined herein have the meanings given to such terms in the
accompanying prospectus supplement. The term "Note" refers to each $1,000
principal amount of our 0.50% Exchangeable Notes due December 13, 2004
(Exchangeable for Shares of Common Stock of Three Companies). In this pricing
supplement, the terms "MSDW," "we," "us" and "our" refer to Morgan Stanley Dean
Witter & Co.

Principal Amount..............   $65,000,000

Maturity Date.................   December 13, 2004

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

Issue Price...................   100%

Interest Rate.................   0.50% per annum

Interest Payment Dates........   June 13 and December 13, beginning June 13,
                                 2000

Original Issue Date
(Settlement Date).............   December 13, 1999

CUSIP.........................   617446DQ9

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


Initial Basket Value..........   $855.615.  Based on the market prices of the
                                 Basket Stocks at the time we priced the notes
                                 on December 8, 1999, the Exchange Ratios have
                                 been initially set so that the Basket Value
                                 on such date equals the Initial Basket Value.

Basket Value..................   The Basket Value, for any date, will equal
                                 the sum of the products of the Market Prices
                                 and the applicable Exchange Ratios for each
                                 Basket Stock, each determined as of such date
                                 by the Calculation Agent.

Basket .......................   The basket is a weighted portfolio of the
                                 three Basket Stocks.  See "Basket Stocks"
                                 below.

Basket Stocks.................   The following table sets forth the Basket
                                 Stocks, the ticker symbol of the Basket
                                 Stocks on the New York Stock Exchange, Inc.,
                                 the percentage of the Initial Basket Value
                                 represented by each Basket Stock, the initial
                                 Market Price of each Basket Stock at the time
                                 we priced the notes on December 8, 1999, the
                                 Exchange Ratio of each Basket Stock and the
                                 initial value of the aggregate shares of each
                                 Basket Stock contained in the Basket at that
                                 time:

<TABLE>
                                                    Percent
                                                  Represented     Initial
                                                   in Initial      Stock     Exchange    Initial
Issuer of Basket Stock                  Ticker    Basket Value     Price      Ratio       Value
- ----------------------                  ------    ------------     -----      -----       -----
<S>                                     <C>       <C>             <C>        <C>         <C>
Citigroup Inc. ("Citigroup")..........    C         33.333%       $56.7938   5.02177     $285.205
EMC Corporation ("EMC")...............   EMC        33.333%       $94.7933   3.00871     $285.205
Tyco International Ltd. ("Tyco")......   TYC        33.333%       $35.9172   7.94062     $285.205
</TABLE>

                                      PS-9

<PAGE>


                                 The Exchange Ratio of each Basket Stock
                                 indicates the number of shares of such Basket
                                 Stock, given the Market Price of such Basket
                                 Stock, required to be included in the
                                 calculation of the Initial Basket Value so
                                 that each Basket Stock represents an
                                 equally-weighted percentage of the Initial
                                 Basket Value.  The respective Exchange Ratios
                                 will remain constant for the term of the
                                 Notes unless adjusted for certain corporate
                                 events.  See "Adjustments to the Exchange
                                 Ratios and the Basket."

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 your Notes to the Trustee, to
                                 exchange each Note for a number of shares of
                                 each Basket Stock equal to the Exchange Ratio
                                 for such Basket Stock, subject to adjustment
                                 as described under "-- Adjustments to the
                                 Exchange Ratios and the Basket" 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 Basket Stocks or
                                 pay an amount in cash equal to the Basket Value
                                 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 but unpaid
                                 interest on the Notes.  If you exchange your
                                 Notes after a record date for the payment of
                                 interest and prior to the next succeeding
                                 Interest Payment  Date, the Notes that you
                                 exchange must be accompanied by funds equal
                                 to the interest Payment Date on the principal
                                 amount that you exchange.

                                 We will, or will cause the Calculation Agent
                                 to, deliver such Basket Stocks or cash to the
                                 Trustee for delivery to you.

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

Exchange Ratio ...............   The Exchange Ratios set forth under "Basket
                                 Stocks" above are subject to adjustment for
                                 certain corporate events.  See "Adjustments
                                 to the Exchange Ratios and Basket" below.

Exchange Date.................   Any Trading Day that falls during the period
                                 beginning January 13, 2000 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.

                                      PS-10

<PAGE>


Company Call Right ...........   On or after December 13, 2001, we may call
                                 the Notes, in whole but not in part, for
                                 mandatory exchange into the Basket Stocks at
                                 the applicable Exchange Ratios provided that,
                                 if the Basket Value on the Trading Day
                                 immediately preceding the Company Notice
                                 Date, as determined by the Calculation Agent,
                                 is less than the Call Price, we will (under
                                 those circumstances only) pay the 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 Basket Stocks
                                 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 Basket
                                 Stocks or cash to the Trustee for delivery to
                                 you.  You will not be entitled to any accrued
                                 but unpaid interest on the Notes.

                                 On or after the Company Notice Date (other
                                 than with respect to a call of the Notes for
                                 the cash Call Price by us) 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
                                 December 13,  2001 specified by us in our
                                 notice of mandatory exchange on which we will
                                 deliver the Basket Stocks or cash to holders
                                 of the Notes for mandatory exchange.

Call Price....................   $1,000 per Note

Market Price..................   If a Basket Stock (or any other security for
                                 which a Market Price must be determined) is
                                 listed on a national securities exchange, is a
                                 security of the Nasdaq National Market 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 such Basket 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 United
                                 States securities exchange registered under
                                 the Securities Exchange Act of 1934, as
                                 modified (the "Exchange Act"), on which such
                                 Basket 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 (even if such
                                 Basket Stock  (or other such security) is
                                 listed or admitted to trading on such
                                 securities exchanges), the last reported sale
                                 price on the over-the-counter market as
                                 reported on the Nasdaq National Market 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 because of a Market Disruption Event
                                 or otherwise, the Market Price for any
                                 Trading Day shall be the mean, as determined

                                      PS-11

<PAGE>


                                 by the Calculation Agent, of the bid prices
                                 for such Basket 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 National
                                 Market" 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 National Market, 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.............   MS & Co.

Calculation Agent.............   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 an owner of the Notes, including with
                                 respect to certain determinations and
                                 judgments that the Calculation Agent must
                                 make in making adjustments to the Exchange
                                 Ratios or other adjustments or determining
                                 the Market Price or whether a Market
                                 Disruption Event has occurred.  See
                                 "Adjustments to the Exchange Ratios and the
                                 Basket" 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.

Adjustments to the Exchange
Ratios and the Basket.........   The Exchange Ratio with respect to any Basket
                                 Stock and the Basket will be adjusted as
                                 follows:

                                 1. If a Basket Stock is subject to a stock
                                 split or reverse stock split, then once such
                                 split has become effective, the Exchange
                                 Ratio of such Basket Stock 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 such Basket Stock.

                                      PS-12

<PAGE>


                                 2. If a Basket Stock is subject (i) to a stock
                                 dividend (issuance of additional shares of such
                                 Basket Stock) that is given ratably to all
                                 holders of shares of such Basket Stock or (ii)
                                 to a distribution of such Basket Stock as a
                                 result of the triggering of any provision of
                                 the corporate charter of the issuer of the
                                 Basket Stock, then once the dividend has become
                                 effective and such Basket Stock is trading ex-
                                 dividend, the Exchange Ratio of such Basket
                                 Stock 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 such Basket Stock
                                 and (ii) the prior Exchange Ratio of such
                                 Basket Stock.

                                 3. There will be no adjustments to any Exchange
                                 Ratio to reflect cash dividends or other
                                 distributions paid with respect to a Basket
                                 Stock other than distributions described in
                                 paragraph 6 below and Extraordinary Dividends
                                 as described below. A cash dividend or other
                                 distribution with respect to a Basket Stock
                                 will be deemed to be an "Extraordinary
                                 Dividend" if such dividend or other
                                 distribution exceeds the immediately preceding
                                 non-Extraordinary Dividend for such Basket
                                 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 such Basket 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 a Basket Stock, the
                                 Exchange Ratio with respect to such Basket
                                 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 a
                                 Basket 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 such Basket
                                 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 a Basket Stock described in
                                 paragraph 6 below that also constitutes an
                                 Extraordinary Dividend shall only cause an
                                 adjustment to the Exchange Ratio for such
                                 Basket Stock pursuant to paragraph 6.

                                 4. If the issuer of a Basket Stock 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 such Basket Stock so
                                 long as a Market Price for such Basket Stock
                                 is available.  If a Market Price is no longer
                                 available for such Basket Stock for whatever
                                 reason, including the liquidation of the
                                 issuer of

                                      PS-13

<PAGE>


                                 such Basket Stock or the subjection of the
                                 issuer of such Basket Stock to a proceeding
                                 under any applicable bankruptcy, insolvency or
                                 other similar law, then the value of such
                                 Basket Stock will equal zero for so long as no
                                 Market Price is available.

                                 5. If there occurs any reclassification or
                                 change of a Basket Stock, including, without
                                 limitation, as a result of the issuance of
                                 tracking stock by the issuer of such Basket
                                 Stock, or if the issuer of such Basket Stock
                                 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 the issuer of such
                                 Basket Stock as an entirety or substantially
                                 as an entirety, in each case as a result of
                                 which the holders of such Basket Stock shall
                                 be entitled to receive stock, other
                                 securities or other property or assets
                                 (including, without limitation, cash or other
                                 classes of stock of the issuer of such Basket
                                 Stock) ("Exchange Property") with respect to
                                 or in exchange for such Basket Stock, then,
                                 with respect to such Basket Stock, 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 at the then current Exchange Ratio for
                                 such Basket Stock immediately prior to any
                                 such corporate event, but without interest
                                 thereon.

                                 6. If the issuer of a Basket Stock issues to
                                 all of its shareholders equity securities of
                                 an issuer other than the issuer of such Basket
                                 Stock (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
                                 such Basket 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 such Basket
                                 Stock.

                                 7. No adjustments to any 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 any Exchange Ratio upon
                                 the occurrence of corporate or other similar
                                 events that affect or could potentially
                                 affect market prices of, or shareholders'
                                 rights in, a Basket Stock (or other Exchange
                                 Property) but only to reflect such changes,
                                 and not with the aim of changing relative
                                 investment risk.

                                 No adjustments to any 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 Calculation Agent shall be solely
                                 responsible for the determination and
                                 calculation of any adjustments to the Exchange

                                      PS-14

<PAGE>

                                 Ratios 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 any
                                 Exchange Ratio upon written request by any
                                 holder of the Notes.

Market Disruption Event.......   "Market Disruption Event" means, with respect
                                 to any Basket Stock, the occurrence or
                                 existence of any of the following events as
                                 determined by the Calculation Agent:

                                    (i) a suspension, absence or material
                                    limitation of trading of such Basket Stock
                                    on the primary market for such Basket 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 such Basket Stock as a result
                                    of which the reported trading prices for
                                    such Basket 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
                                    such Basket Stock, if available, during
                                    the one-half hour period preceding the
                                    close of trading in the applicable market;
                                    and

                                    (ii) a determination by the Calculation
                                    Agent in its sole discretion that any
                                    event described in clause (i) above
                                    materially interfered with the ability of
                                    MSDW or any of its 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 NYSE 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 any Basket
                                 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 such Basket Stock
                                 and (5) a suspension, absence or material
                                 limitation of

                                      PS-15

<PAGE>


                                 trading on the primary securities market on
                                 which options contracts related to any Basket
                                 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
                                 principal amount of the Note plus any accrued
                                 and unpaid interest at the Interest Rate  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 us
                                 in accordance with the Exchange Right or (y)
                                 we have 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
                                 Basket Value, determined by the Calculation
                                 Agent as of the Exchange Date or as of the
                                 date of acceleration, respectively, and shall
                                 not include any accrued and unpaid interest
                                 thereon; provided further that if we have
                                 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 Call
                                 Price.  See "--Call Price" above.

Basket Stocks;
Public Information............   Each of the three issuers of Basket Stocks 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
                                 each of the issuers pursuant to the Exchange
                                 Act can be located by reference to its
                                 respective Commission file number.  In
                                 addition, information regarding the issuers
                                 of the Basket Stocks 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 information.

                                      PS-16

<PAGE>


                                 Citigroup Inc. is a diversified holding
                                 company whose businesses provide a broad
                                 range of financial services to consumers and
                                 corporate customers around the world, and its
                                 Commission file number is 1-9924.

                                 EMC Corporation designs, manufacturers,
                                 markets and supports a wide range of
                                 hardware, software and service products for
                                 the enterprise storage markets, and its
                                 Commission file number is 1-9853.

                                 Tyco International Ltd. engages in the
                                 manufacture and distribution of disposable
                                 medical supplies and other specialty
                                 products, the design, manufacture,
                                 installation and service of fire detection and
                                 suppression systems and the manufacture and
                                 distribution of flow control products and
                                 electrical and electronic components, and its
                                 Commission file number is 0-16979.

                                 This pricing supplement relates only to the
                                 Notes offered hereby and does not relate to
                                 the Basket Stocks or other securities of the
                                 issuers of the Basket Stocks.  We have
                                 derived all disclosures contained in this
                                 pricing supplement regarding the issuers of
                                 the Basket Stocks from the publicly available
                                 documents described above.  Neither we nor
                                 the Agent has participated in the preparation
                                 of such documents or made any due diligence
                                 inquiry with respect to the issuers of the
                                 Basket Stocks in connection with the offering
                                 of the Notes.  Neither we nor the Agent makes
                                 any representation that such publicly
                                 available documents are or any other publicly
                                 available information regarding the issuers
                                 of the Basket Stocks is 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 above) that
                                 would affect the trading price of the Basket
                                 Stocks (and therefore the Initial Basket
                                 Value and the Exchange Ratios) have been
                                 publicly disclosed.  Subsequent disclosure of
                                 any such events or the disclosure of or
                                 failure to disclose material future events
                                 concerning the issuers of the Basket Stocks
                                 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 any of the Basket Stocks or the
                                 Basket as a whole.

                                 We and/or our subsidiaries may presently or
                                 from time to time engage in business with the
                                 issuers of the Basket Stocks, including
                                 extending loans to, entering into loans with,
                                 or making equity investments in, the issuers
                                 of the Basket Stocks or providing advisory
                                 services to the issuers of the Basket Stocks,
                                 including merger and acquisition advisory
                                 services.  In the course of such business, we
                                 and/or our subsidiaries may acquire
                                 non-public information with respect to the
                                 issuers of the Basket Stocks.  The statement
                                 in the preceding sentence is not intended to
                                 affect the rights of the holders

                                      PS-17

<PAGE>


                                 of the Notes under the securities laws. In
                                 addition, one or more of our affiliates may
                                 publish research reports with respect to the
                                 issuers of the Basket Stocks. The Basket was
                                 compiled independently of any research
                                 recommendations and may not be consistent with
                                 such recommendations. As a prospective
                                 purchaser of a Note, you should undertake such
                                 independent investigation of the issuers of the
                                 Basket Stocks as in your judgment is
                                 appropriate to make an informed decision with
                                 respect to an investment in the Basket Stocks.

Historical Information........   The following table sets forth the published
                                 high and low Market Price during 1996, 1997,
                                 1998 and during 1999 through December 8,
                                 1999.  The market price of each Basket Stock
                                 when we priced the notes on December 8, 1999
                                 is set forth in the table under "Basket
                                 Stocks" above.  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 the Basket Stocks as an indication
                                 of future performance.  We cannot give any
                                 assurance that the price of the Basket Stocks
                                 as a whole or any one or more of the Basket
                                 Stocks will increase sufficiently to cause the
                                 beneficial owners of the Notes to receive an
                                 amount in excess of the Issue Price on any
                                 Exchange Date or Call Date.


                                                                      Dividends
                           Citigroup             High        Low      per Share
                        ---------------          ----        ---      ---------
                 (CUSIP 172967101)
                 1996
                 First Quarter................  15 1/2     12 25/32     0.05
                 Second Quarter...............  15 13/64   12 2/3       0.05
                 Third Quarter................  16 3/8     13 29/64     0.05
                 Fourth Quarter...............  21 1/16    16 43/64     0.05
                 1997
                 First Quarter................  25 57/64   19 25/32     0.066
                 Second Quarter...............  29 21/64   20 39/64     0.066
                 Third Quarter................  32 9/64    28 7/32      0.066
                 Fourth Quarter...............  37 45/64   28 57/64     0.066
                 1998
                 First Quarter................     42      31 3/8       0.083
                 Second Quarter...............  48 43/64   39 37/64     0.083
                 Third Quarter................  48 27/64     25         0.083
                 Fourth Quarter...............  35 1/4     21 11/64     0.12
                 1999
                 First Quarter................     44      33 35/64     0.12
                 Second Quarter...............  50 7/8     41 9/16      0.14
                 Third Quarter................  49 1/16    42 1/8       0.14
                 Fourth Quarter
                   (through December 8, 1999).  58 1/8     52 1/8       0.14

                                Historical prices have been adjusted for three
                                separate 3-for-2 stock splits of the common
                                stock of Citigroup Inc., which became
                                effective in the second quarter of 1996, the
                                fourth quarter of 1997 and the second quarter
                                of 1999, respectively, and for a 4-for-3 stock
                                split, which became effective in the fourth
                                quarter of 1996.

                                      PS-18

<PAGE>


                                                                      Dividends
                             EMC                 High        Low      per Share
                           -------               ----        ---      ---------
                 (CUSIP 268648102)
                 1996
                 First Quarter................   5 1/2      3 29/32        -
                 Second Quarter...............   5 25/32    4 1/2          -
                 Third Quarter................   5 13/16    4 7/32         -
                 Fourth Quarter...............   8 5/8      5 9/16         -
                 1997
                 First Quarter................   9 13/16    8 1/32         -
                 Second Quarter...............   10 5/32    8 1/8          -
                 Third Quarter................   15 7/16    9 51/64        -
                 Fourth Quarter...............   16 1/4    11 13/16        -
                 1998
                 First Quarter................   19 13/32  12 19/32        -
                 Second Quarter...............   23 1/2    17 31/32        -
                 Third Quarter................   30 15/16  22 7/32         -
                 Fourth Quarter...............   42 1/2    22 19/32        -
                 1999
                 First Quarter................   64 15/16  43 1/2          -
                 Second Quarter...............   67 15/32  47 3/4          -
                 Third Quarter................   74 5/8    53 5/8          -
                 Fourth Quarter
                   (through December 8, 1999).   95 9/16   63              -


                                Historical prices have been adjusted for two
                                2-for-1 stock splits of the common stock of
                                EMC Corporation, which became effective in the
                                fourth quarter of 1997 and the second quarter
                                of 1999, respectively.

                                                                      Dividends
                             Tyco                High        Low      per Share
                            ------               ----        ---      ---------
                 (CUSIP 902124106)
                 1996
                 First Quarter................   9 11/16    8 3/6       0.0125
                 Second Quarter...............  10 5/16     8 15/16     0.0125
                 Third Quarter................  11 5/32     9 1/4       0.0125
                 Fourth Quarter...............  13 11/16   10 13/16     0.0125
                 1997
                 First Quarter................  15 7/16    13 1/8       0.0125
                 Second Quarter...............  17 55/64   13 19/32     0.0125
                 Third Quarter................  21 1/4     17 45/64     0.0125
                 Fourth Quarter...............  22 17/32   18 3/32      0.0125
                 1998
                 First Quarter................  28 5/16    21 1/2       0.0125
                 Second Quarter...............  31 1/2     25 25/32     0.0125
                 Third Quarter................  34 9/32    26 1/8       0.0125
                 Fourth Quarter...............  38 7/32    22 3/8       0.0125
                 1999
                 First Quarter................  39 19/32   34 4/16      0.0125
                 Second Quarter...............  47 3/8     35 19/32     0.0125
                 Third Quarter................  52 11/16   47 7/16
                 Fourth Quarter
                   (through December 8, 1999).  52 31/32   35           0.0125


                                 Historical prices have been adjusted for two
                                 2-for-1 stock splits of the common stock of
                                 Tyco International Ltd., which became
                                 effective in the fourth quarter of 1997 and
                                 the fourth quarter of 1999, respectively.

                                      PS-19

<PAGE>


                                 We make no representation as to the amount of
                                 dividends, if any, that the issuers of the
                                 Basket Stocks will pay in the future.  In any
                                 event, as an owner of a Note, you will not be
                                 entitled to receive dividends, if any, that
                                 may be payable on the Basket Stocks.

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 the Basket Stocks 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 the Basket Stocks.  Our purchase activity
                                 could potentially have increased the price of
                                 the Basket Stocks, and therefore effectively
                                 have increased the level to which the Basket
                                 Stocks must rise before you would receive an
                                 amount of the Basket Stocks 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 the
                                 Basket Stocks, options contracts on the
                                 Basket Stocks 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
                                 have, or any of our affiliates has, engaged
                                 in or may engage in has had or will have a
                                 material impact on the price of the Basket
                                 Stocks we cannot give any assurance that we
                                 have not or will not affect such prices 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 Basket Stocks.
                                 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 Basket Stocks 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 subsidiaries and
                                 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

                                      PS-20

<PAGE>


                                 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 to considering the
                                 consequences of holding the Notes, 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
                                 Basket Stocks.  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 6.95%, 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

                                      PS-21

<PAGE>


                                 to each integral multiple thereof) consists of
                                 the semi-annual coupons and an additional
                                 projected amount due at maturity, equal to
                                 $1,380.40.

                                 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.

                                      PS-22

<PAGE>


                                                                         ANNEX A

                           OFFICIAL NOTICE OF EXCHANGE

                                           Dated: [On or after January 13, 2000]

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, 0.50% Exchangeable Notes due December 13, 2004 (Exchangeable for
Shares of Common Stock of Three Companies (the "Basket Stocks")) of Morgan
Stanley Dean Witter & Co. (CUSIP No. 617446DQ9) (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) December 13, 2004, (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. 30 dated December 8, 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. 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 Morgan Stanley
Dean Witter & Co. will deliver, at its sole option, shares of the Basket Stocks
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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