MORGAN STANLEY DEAN WITTER & CO
424B3, 1999-08-06
FINANCE SERVICES
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PROSPECTUS Dated May 5, 1999                        Pricing Supplement No. 22 to
PROSPECTUS SUPPLEMENT                       Registration Statement No. 333-75289
Dated May 6, 1999                                           Dated August 3, 1999
                                                                  Rule 424(b)(3)


                                   $5,000,000
                        Morgan Stanley Dean Witter & Co.
                           MEDIUM-TERM NOTES, SERIES C
                             Senior Fixed Rate Notes

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

                      Exchangeable Notes due August 6, 2006
                   Exchangeable for Shares of Common Stock of
                              QUALCOMM INCORPORATED

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

The notes will not pay any interest but will be issued at a discount and thus
have a minimum yield to maturity of 0.25%. Beginning November 6, 1999, you
will be able to exchange your notes for a number of shares of QUALCOMM common
stock, subject to our right to call all of the notes on or after August 6,
2001.

o  The price of each note is $982.66 (98.266% of the $1,000 principal amount
   at maturity). This issue price represents a yield to maturity of 0.25% per
   year compounded semi-annually.

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

o  Beginning November 6, 1999, you will have the right to exchange each note
   for 5.59283 shares of QUALCOMM common stock.  If you exchange, we will have
   the right to deliver either the actual shares or the cash value of such
   shares to you.  You will not receive any accrued original issue discount.

o  Beginning August 6, 2001, we have the right to call all of the notes and
   pay to you the call price, which will be an amount per note equal to the
   issue price of $982.66 plus accrued original issue discount, or OID, to the
   call date.  However, if the market value of 5.59283 shares of QUALCOMM
   common stock on the last trading day before we send our call notice is
   equal to or greater than the call price, we will deliver to you 5.59283
   shares of QUALCOMM common stock per note instead.

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

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

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

o  We will apply to list the notes to trade under the proposed symbol "MSQCOM
   ZR06" on the New York Stock Exchange, Inc.

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

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

                               -------------------
                                  PRICE 98.266%
                               -------------------

              Price to Public    Agent's Commissions    Proceeds to Company
              ---------------    -------------------    -------------------
Per Note...       98.266%               0.25%                 98.016%
Total......     $4,913,300             $12,500              $4,900,800



                           MORGAN STANLEY DEAN WITTER



                      (This page intentionally left blank)



                          SUMMARY OF PRICING SUPPLEMENT

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


                                  The Notes

Each note costs $982.66           We, Morgan Stanley Dean Witter & Co., are
                                  offering you Exchangeable Notes due August 6,
                                  2006, which you may exchange for QUALCOMM
                                  Incorporated common stock beginning on
                                  November 6, 1999. The price of each note is
                                  $982.66 (98.266% of the $1,000 principal
                                  amount at maturity). We refer to QUALCOMM
                                  Incorporated common stock as QCOM Stock. We
                                  will not pay interest on the notes. If you
                                  hold the notes to maturity, which is August 6,
                                  2006, we will pay $1,000 per note to you. This
                                  payment represents the $982.66 issue price
                                  plus a yield to maturity of 0.25% per year
                                  compounded semi-annually.

                                  Your Exchange Right

The exchange ratio                Beginning November 6, 1999, you may exchange
is 5.59283                        each note for a number of shares of QCOM Stock
                                  equal to the exchange ratio. The exchange
                                  ratio is 5.59283 shares of QCOM Stock per
                                  note, subject to adjustment for certain
                                  corporate events relating to QUALCOMM
                                  Incorporated, which we refer to as QUALCOMM.
                                  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 you will receive based on the principal
                                  amount of the notes you exchange and the
                                  exchange ratio as it may have been adjusted
                                  through the time of the exchange.

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

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

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

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

                                  If you give us your Official Notice of
                                  Exchange after 11:00 a.m. (New York City time)
                                  on any day or 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
you cash or QCOM Stock            business days after you give us your Official
if you elect to exchange          Notice of Exchange, either:
your notes
                                  o  shares of QCOM Stock, or

                                  o  the cash value of such shares.

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

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

Our Call Right                    Beginning August 6, 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 QCOM 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 for         On the last trading day before the date of our
stock or cash, depending          call notice, the calculation agent will
on the price of QCOM Stock        determine the value of the shares of QCOM
                                  Stock that a noteholder would receive upon
                                  exchange of a note. That value is referred to
                                  as parity. If parity is less than the call
                                  price (the sum of the issue price of $982.66
                                  plus the yield that will have accrued on the
                                  note to the call date), then we will pay the
                                  call price to you in cash. If we notify you
                                  that we will give you cash on the call date,
                                  you will no longer be able to exercise your
                                  exchange right.

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

QCOM Stock is                     The last reported sales price of QCOM Stock on
currently $140 a share            the Nasdaq National Market on the date of this
                                  pricing supplement was $140. You can review
                                  the publicly- reported prices of QCOM Stock
                                  for the last three years in the "Historical
                                  Information" section of this pricing
                                  supplement.

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

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

More Information                  The notes are senior notes issued as part of
on the Notes                      our Series C medium-term note program. You can
                                  find a general description of our Series C
                                  medium-term note program in the accompanying
                                  prospectus supplement dated 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).



                                  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 have a yield to maturity of
Interest on Ordinary Notes        0.25% per year based on the issue price of
                                  $982.66 and computed on a semi-annual
                                  bond-equivalent basis. This yield to maturity
                                  is lower than the rate of interest that we
                                  would pay on non-exchangeable senior notes
                                  maturing at the same time as the notes. If you
                                  exchange your notes for QCOM Stock, you will
                                  not receive accrued original issue discount.

Notes May Not Be                  There may be little or no secondary market for
Actively Traded                   the notes. Although we will apply to list the
                                  notes on the New York 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 QCOM Stock

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

                                  o  the dividend rate on the QCOM Stock

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

                                  o  interest and yield rates in the market

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

                                  o  our creditworthiness

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

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

No Affiliation with               We are not affiliated with QUALCOMM.  We or
QUALCOMM                          our affiliates may presently or from time to
                                  time engage in business with QUALCOMM,
                                  including extending loans to, or making equity
                                  investments in, QUALCOMM or its affiliates or
                                  subsidiaries or providing investment advisory
                                  services to QUALCOMM, including merger and
                                  acquisition advisory services. In the course
                                  of our business, we or our affiliates may
                                  acquire non-public information about QUALCOMM.
                                  Moreover, we have no ability to control or
                                  predict the actions of QUALCOMM, including any
                                  corporate actions of the type that would
                                  require the calculation agent to adjust the
                                  exchange ratio. QUALCOMM is not involved in
                                  the offering of the notes in any way and has
                                  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 QUALCOMM.

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

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

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

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


                              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 $982.66 issue
price of our Exchangeable Notes due August 6, 2006 (Exchangeable for Shares of
Common Stock of QUALCOMM Incorporated). In this pricing supplement, the terms
"MSDW," "we," "us" and "our" refer to Morgan Stanley Dean Witter & Co.

Principal Amount..............   $5,000,000

Maturity Date.................   August 6, 2006

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

Issue Price...................   $982.66 (98.266% of the principal amount at
                                 maturity)

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

Original Issue Date
(Settlement Date).............   August 6, 1999

CUSIP.........................   617446DM8

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

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 5.59283 shares (the
                                 "Exchange Ratio") of QCOM Stock, subject to
                                 adjustment as described under "--Antidilution
                                 Adjustments" below.  You will not, however,
                                 be entitled to exchange your Notes if we have
                                 previously called the Notes for the cash Call
                                 Price as described under "--Company Call
                                 Right" below.

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

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

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

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

Exchange Ratio ...............   5.59283, subject to adjustment for certain
                                 corporate events relating to QUALCOMM.  See
                                 "--Antidilution Adjustments" below.

Exchange Date.................   Any Trading Day that falls during the period
                                 beginning November 6, 1999 and ending on the
                                 day prior to the earliest of (i) the Maturity
                                 Date, (ii) the Call Date and (iii) in the
                                 event of a call for the cash Call Price as
                                 described under "--Company Call Right" below,
                                 the Company Notice Date.

Company Call Right ...........   On or after August 6, 2001, we may call the
                                 Notes, in whole but not in part, for
                                 mandatory exchange into QCOM Stock at the
                                 Exchange Ratio; provided that, if Parity on
                                 the Trading Day immediately preceding the
                                 Company Notice Date, as determined by the
                                 Calculation Agent, is less than the
                                 applicable Call Price for the Call Date
                                 specified in our Notice of mandatory
                                 exchange, we will (under those circumstances
                                 only) pay such applicable Call Price in cash
                                 on the Call Date.  If we call the Notes for
                                 mandatory exchange, then, unless you
                                 subsequently exercise the Exchange Right (the
                                 exercise of which will not be available to
                                 you following a call for cash in an amount
                                 equal to the Call Price), the QCOM Stock or
                                 (in the event of a call for cash, as
                                 described above) cash to be delivered to you
                                 will be delivered on the Call Date fixed by
                                 us and set forth in our notice of mandatory
                                 exchange, upon delivery of your Notes to the
                                 Trustee.  We will, or will cause the
                                 Calculation Agent to, deliver such shares of
                                 QCOM Stock or cash to the Trustee for
                                 delivery to you.

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

                                 On or after the Company Notice Date (other
                                 than with respect to a call of the Notes for
                                 the cash Call Price by 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 August
                                 6, 2001 specified by us in our notice of
                                 mandatory exchange on which we will deliver
                                 QCOM Stock or cash to holders of the Notes
                                 for mandatory exchange.

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

Call Price....................   The table below shows indicative Call Prices
                                 for each $1,000 principal amount of Notes on
                                 August 6, 2001 and at each August 6
                                 thereafter to and including the Maturity
                                 Date.  The Call Price for each $1,000
                                 principal amount of Notes called for mandatory
                                 exchange on Call Dates between such
                                 indicative dates would include an additional
                                 amount reflecting Stated OID accrued from the
                                 next preceding date in the table through the
                                 applicable Call Date at a rate of 0.25% per
                                 annum.  Such additional accreted amount of
                                 Stated OID will be determined by the
                                 Calculation Agent and will be calculated on a
                                 semiannual bond-equivalent basis based on the
                                 Call Price for the immediately preceding Call
                                 Date indicated in the table below.

                                 Call Date                       Call Price
                                 ---------                       ----------
                                 August 6, 2001................  $  987.59
                                 August 6, 2002................  $  990.06
                                 August 6, 2003................  $  992.53
                                 August 6, 2004................  $  995.02
                                 August 6, 2005................  $  997.50
                                 Maturity......................  $1,000.00

Market Price..................   If QCOM 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 QCOM 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 QCOM 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 QCOM Stock (or
                                 other such security) is listed or admitted to
                                 trading on such securities exchange), 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 by the Calculation Agent, of the bid
                                 prices for QCOM 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
                                 Ratio or other antidilution adjustments or
                                 determining the Market Price or whether a
                                 Market Disruption Event has occurred.  See
                                 "Antidilution Adjustments" and "Market
                                 Disruption Event" below.  MS & Co. is
                                 obligated to carry out its duties and
                                 functions as Calculation Agent in good faith
                                 and using its reasonable judgment.

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

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

                                 2. If QCOM Stock is subject (i) to a stock
                                 dividend (issuance of additional shares of
                                 QCOM Stock) that is given ratably to all
                                 holders of shares of QCOM Stock or (ii) to a
                                 distribution of QCOM Stock as a result of the
                                 triggering of any provision of the corporate
                                 charter of QUALCOMM, then once the dividend
                                 has become effective and QCOM Stock is
                                 trading ex-dividend, the Exchange Ratio will
                                 be adjusted so that the new Exchange Ratio
                                 shall equal the prior Exchange Ratio plus the
                                 product of (i) the number of shares issued
                                 with respect to one share of QCOM Stock and
                                 (ii) the prior Exchange Ratio.

                                 3. There will be no adjustments to the Exchange
                                 Ratio to reflect cash dividends or other
                                 distributions paid with respect to QCOM Stock
                                 other than distributions described in paragraph
                                 6 below and Extraordinary Dividends as
                                 described below. A cash dividend or other
                                 distribution with respect to QCOM Stock will be
                                 deemed to be an "Extraordinary Dividend" if
                                 such dividend or other distribution exceeds the
                                 immediately preceding non-Extraordinary
                                 Dividend for QCOM 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 QCOM 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 QCOM Stock, the
                                 Exchange Ratio with respect to QCOM 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 QCOM 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 QCOM Stock or
                                 (ii) in the case of cash dividends or other
                                 distributions that do not constitute quarterly
                                 dividends, the amount per share of such
                                 Extraordinary Dividend. To the extent an
                                 Extraordinary Dividend is not paid in cash, the
                                 value of the non-cash component will be
                                 determined by the Calculation Agent, whose
                                 determination shall be conclusive. A
                                 distribution on the QCOM Stock described in
                                 paragraph 6 below that also constitutes an
                                 Extraordinary Dividend shall only cause an
                                 adjustment to the Exchange Ratio pursuant to
                                 paragraph 6.

                                 4. If QUALCOMM 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 QCOM Stock so long as a Market Price for
                                 QCOM Stock is available.  If a Market Price
                                 is no longer available for QCOM Stock for
                                 whatever reason, including the liquidation of
                                 QUALCOMM or the subjection of QUALCOMM to a
                                 proceeding under any applicable bankruptcy,
                                 insolvency or other similar law, then the
                                 value of QCOM Stock will equal zero for so
                                 long as no Market Price is available.

                                 5. If there occurs any reclassification or
                                 change of QCOM Stock, including, without
                                 limitation, as a result of the issuance of
                                 tracking stock by QUALCOMM, or if QUALCOMM
                                 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 QUALCOMM as an entirety or
                                 substantially as an entirety, in each case as
                                 a result of which the holders of QCOM Stock
                                 shall be entitled to receive stock, other
                                 securities or other property or assets
                                 (including, without limitation, cash or other
                                 classes of stock of QUALCOMM) ("Exchange
                                 Property") with respect to or in exchange for
                                 such QCOM Stock, then the holders of the Notes
                                 then outstanding will be entitled thereafter
                                 to exchange such Notes into the kind and
                                 amount of Exchange Property that they would
                                 have owned or been entitled to receive upon
                                 such reclassification, change, merger,
                                 combination, consolidation, sale or
                                 conveyance had such holders exchanged such
                                 Notes at the then current Exchange Ratio for
                                 QCOM Stock immediately prior to any such
                                 corporate event, but without interest
                                 thereon.

                                 6. If QUALCOMM issues to all of its
                                 shareholders equity securities of an issuer
                                 other than QUALCOMM (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 QCOM 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 QCOM Stock.

                                 7. No adjustments to the Exchange Ratio will
                                 be required other than those specified above.
                                 However, we may, at our sole discretion,
                                 cause the Calculation Agent to make
                                 additional changes to the Exchange Ratio upon
                                 the occurrence of corporate or other similar
                                 events that affect or could potentially
                                 affect market prices of, or shareholders'
                                 rights in, the QCOM Stock (or other Exchange
                                 Property) but only to reflect such changes,
                                 and not with the aim of changing relative
                                 investment risk.

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

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

                                 The Calculation Agent shall be solely
                                 responsible for the determination and
                                 calculation of any adjustments to the Exchange
                                 Ratio and of any related determinations and
                                 calculations with respect to any
                                 distributions of stock, other securities or
                                 other property or assets (including cash) in
                                 connection with any corporate event described
                                 in paragraph 5 or 6 above, and its
                                 determinations and calculations with respect
                                 thereto shall be conclusive.

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

Market Disruption Event.......   "Market Disruption Event" means, with respect
                                 to QCOM 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 QCOM Stock on the
                                    primary market for QCOM 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 QCOM Stock as a result of which the
                                    reported trading prices for QCOM 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 QCOM 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 the
                                    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 QCOM 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 QCOM Stock and
                                 (5) a suspension, absence or material
                                 limitation of trading on the primary
                                 securities market on which options contracts
                                 related to QCOM Stock are traded will not
                                 include any time when such securities market
                                 is itself closed for trading under ordinary
                                 circumstances.

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

QCOM Stock;
Public Information............   QUALCOMM is a provider of digital wireless
                                 communications products, technologies and
                                 services.  QCOM Stock is registered under the
                                 Exchange Act.  Companies with securities
                                 registered under the Exchange Act are
                                 required to file periodically certain
                                 financial and other information specified by
                                 the Securities and Exchange Commission (the
                                 "Commission").  Information provided to or
                                 filed with the Commission can be inspected
                                 and copied at the public reference facilities
                                 maintained by the Commission at Room 1024,
                                 450 Fifth Street, N.W., Washington, D.C.
                                 20549 or at its Regional Offices located at
                                 Suite 1400, Citicorp Center, 500 West Madison
                                 Street, Chicago, Illinois 60661 and at Seven
                                 World Trade Center, 13th Floor, New York, New
                                 York 10048, and copies of such material can
                                 be obtained from the Public Reference Section
                                 of the Commission, 450 Fifth Street, N.W.,
                                 Washington, D.C. 20549, at prescribed rates.
                                 In addition, information provided to or filed
                                 with the Commission electronically can be
                                 accessed through a website maintained by the
                                 Commission.  The address of the Commission's
                                 website is http://www.sec.gov.  Information
                                 provided to or filed with the Commission by
                                 QUALCOMM pursuant to the Exchange Act can be
                                 located by reference to Commission file
                                 number 0-19528.  In addition, information
                                 regarding QUALCOMM 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.

                                 This pricing supplement relates only to the
                                 Notes offered hereby and does not relate to
                                 QCOM Stock or other securities of QUALCOMM.
                                 We have derived all disclosures contained in
                                 this pricing supplement regarding QUALCOMM
                                 from the publicly available documents
                                 described in the preceding paragraph.
                                 Neither we nor the Agent has participated in
                                 the preparation of such documents or made any
                                 due diligence inquiry with respect to
                                 QUALCOMM 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 QUALCOMM 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 in the preceding
                                 paragraph) that would affect the trading
                                 price of QCOM Stock (and therefore the
                                 Exchange Ratio) have been publicly disclosed.
                                 Subsequent disclosure of any such events or
                                 the disclosure of or failure to disclose
                                 material future events concerning QUALCOMM
                                 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 QCOM Stock.

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

Historical Information........   The following table sets forth the published
                                 high and low Market Price during 1996, 1997,
                                 1998 and during 1999 through August 3, 1999.
                                 The Market Price on August 3, 1999 was $140.
                                 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 QCOM
                                 Stock as an indication of future performance.
                                 We cannot give any assurance that the price
                                 of QCOM Stock will increase sufficiently to
                                 cause the beneficial owners of the Notes to
                                 receive an amount in excess of the principal
                                 amount on any Exchange Date or Call Date.


                                      QCOM Stock              High        Low
                                      ----------              ----        ---
                             (CUSIP 747525103)
                             1996
                             First Quarter................  23 29/32    17 35/64
                             Second Quarter...............  26 5/8      14 63/64
                             Third Quarter................  25 39/64    18 37/64
                             Fourth Quarter...............  22 1/2      17 47/64
                             1997
                             First Quarter................  30 7/8      19 1/4
                             Second Quarter...............  29 13/32    20 23/32
                             Third Quarter................  31 9/64     21 27/64
                             Fourth Quarter...............  34 23/32    22 13/32
                             1998
                             First Quarter................  27 29/32    22 1/2
                             Second Quarter...............  29 7/32     22 55/64
                             Third Quarter................  32 53/64    20 13/16
                             Fourth Quarter...............  29 5/32     19 9/16
                             1999
                             First Quarter................  62 3/16     27 23/32
                             Second Quarter............... 143 1/2      62 5/16
                             Third Quarter
                               (through August 3, 1999)... 162 15/16   139 7/16

                                 Historical prices have been adjusted for a
                                 spinoff effected by QUALCOMM in the third
                                 quarter of 1998 and a 2 for 1 stock split of
                                 QCOM Stock, which became effective in the
                                 second quarter of 1999.

                                 We make no representation as to the amount of
                                 dividends, if any, that QUALCOMM 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
                                 QCOM Stock.

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

                                 On or prior to the date of this pricing
                                 supplement, we, through our subsidiaries and
                                 others, hedged our anticipated exposure in
                                 connection with the Notes by taking positions
                                 in QCOM Stock and positions in other
                                 instruments in connection with such hedging.
                                 Such hedging was carried out in a manner
                                 designed to minimize any impact on the price
                                 of QCOM Stock.  Our purchase activity could
                                 potentially have increased the price of QCOM
                                 Stock, and therefore effectively have
                                 increased the level to which QCOM Stock must
                                 rise before you would receive an amount of
                                 QCOM Stock worth as much or more than the
                                 accreted principal amount of your Notes on any
                                 Exchange Date or Call Date.  Through our
                                 subsidiaries, we are likely to modify our
                                 hedge position throughout the life of the
                                 Notes by purchasing and selling QCOM Stock,
                                 options contracts on QCOM Stock listed on
                                 major securities markets or positions in other
                                 securities or instruments that we may wish to
                                 use in connection with such hedging.
                                 Although we have no reason to believe that our
                                 hedging activity or other trading activities
                                 that we, or any of our affiliates, engaged in
                                 or may engage in has had or will have a
                                 material impact on the price of QCOM Stock,
                                 we cannot give any assurance that we have not
                                 or will not affect such price as a result of
                                 our hedging or trading activities.

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

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

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

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

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

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

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

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

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

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

                                 Under ERISA, assets of a pension or other
                                 employee benefit plan may include assets held
                                 in the general account of an insurance
                                 company which has issued an insurance policy
                                 to such plan or assets of an entity in which
                                 the plan has invested.  In addition 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 QCOM Stock.  Thus,
                                 any insurance company, pension or employee
                                 benefit plan or entity holding assets of such
                                 a plan proposing to invest in the Notes should
                                 consult with its legal counsel prior to such
                                 investment.

United States
Federal Taxation..............   The Notes are Optionally Exchangeable Notes
                                 and investors should refer to the discussion
                                 under "United States Federal
                                 Taxation--Notes--Optionally Exchangeable
                                 Notes" in the accompanying prospectus
                                 supplement.  In connection with the
                                 discussion thereunder, we have determined
                                 that the "comparable yield" is an annual rate
                                 of 7.08%, compounded semi-annually.  Based on
                                 our determination of the comparable yield,
                                 the "projected payment schedule" for a Note
                                 (assuming a par amount of $1,000 or with
                                 respect to each integral multiple thereof)
                                 consists of a projected amount due at
                                 maturity, equal to $1,599.25.

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



                                                                         ANNEX A

                           OFFICIAL NOTICE OF EXCHANGE

                                          Dated:  [On or after November 6, 1999]

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

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

Dear Sirs:

      The undersigned holder of the Medium Term Notes, Series C, Senior Fixed
Rate Notes, Exchangeable Notes due August 6, 2006 (Exchangeable for Shares of
Common Stock of QUALCOMM Incorporated) of Morgan Stanley Dean Witter & Co.
(CUSIP No. 617446DM8) (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)
August 6, 2006, (ii) the Call Date and (iii) in the event of a call for cash,
the Company Notice Date, the Exchange Right as described in Pricing Supplement
No. 22 dated August 3, 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 common stock of QUALCOMM
Incorporated 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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