MORGAN STANLEY DEAN WITTER & CO
424B3, 1999-06-04
FINANCE SERVICES
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PROSPECTUS Dated May 5, 1999                      Pricing Supplement No. 11 to
PROSPECTUS SUPPLEMENT                     Registration Statement No. 333-75289
Dated May 6, 1999                                           Dated May 27, 1999
                                                                Rule 424(b)(3)


                                   $15,900,000
                        Morgan Stanley Dean Witter & Co.
                           MEDIUM-TERM NOTES, SERIES C
                             Senior Fixed Rate Notes

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

                       Exchangeable Notes due June 5, 2006
                   Exchangeable for Shares of Common Stock of
                               CISCO SYSTEMS, INC.

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

The notes will not pay any interest but will be issued at a discount and thus
have a minimum yield to maturity of 0.25%. Beginning September 4, 1999, you
will be able to exchange your notes for a number of shares of Cisco common
stock, subject to our right to call all of the notes on or after June 4, 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 September 4, 1999, you will have the right to exchange each note
    for 7.3895 shares of Cisco 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 June 4, 2001, we have the right to call all of the notes and pay
    you the call price, which will be an amount per note equal to the issue
    price of $982.66 plus accrued original issue discount, or OID, to the call
    date.  However, if the market value of 7.3895 shares of Cisco 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 7.3895 shares of Cisco
    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 Cisco common stock on the
    call date, rather than the cash call price, you will still be able to
    exercise your exchange right on any day prior to the call date.

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

o   Cisco 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 "MSCSCO
    ZR06" on the New York Stock Exchange, Inc., subject to the NYSE listing
    requirements and approval.

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.........      $15,624,294            $39,750              $15,584,544



                           MORGAN STANLEY DEAN WITTER




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                          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 June 5,
                                 2006, which you may exchange for Cisco Systems,
                                 Inc. common stock ("Cisco Stock") beginning on
                                 September 4, 1999. The price of each note is
                                 $982.66 (98.266% of the $1,000 principal amount
                                 at maturity). We will not pay interest on the
                                 notes. If you hold the notes to maturity, which
                                 is June 5, 2006, we will pay you $1,000 per
                                 note. This payment represents the $982.66 issue
                                 price plus a yield to maturity of 0.25% per
                                 year compounded semi-annually.

                                 Your Exchange Right

The exchange ratio               Beginning September 4, 1999, you may exchange
is 7.3895                        each note for a number of shares of Cisco Stock
                                 equal to the exchange ratio. The exchange ratio
                                 is 7.3895 shares of Cisco Stock per note,
                                 subject to adjustment for certain corporate
                                 events relating to Cisco Systems, Inc.
                                 ("Cisco"). When you exchange your notes, Morgan
                                 Stanley & Co. Incorporated ("MS & Co."), acting
                                 as calculation agent, will determine the exact
                                 number of shares you will receive based on the
                                 principal amount of the notes you exchange and
                                 the exchange ratio as it may have been adjusted
                                 through the time of the exchange.

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

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

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

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

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

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

                                 o shares of Cisco 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 June 4, 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
                                   Cisco Stock or the cash call price that we
                                   will pay you in exchange for each note, as
                                   explained in the next paragraph.

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

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

Cisco Stock is currently         The last reported sales price of Cisco Stock on
$108 a share                     the Nasdaq National Market on the date of this
                                 Pricing Supplement was $108. You can review the
                                 publicly-reported prices of Cisco 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
                                 Cisco 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 Cisco
                                 Stock and that we describe in the section
                                 called "Description of Notes--Antidilution
                                 Adjustments" in this Pricing Supplement.

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

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. You
                                 should also read about some of the risks
                                 involved in investing in the notes in the
                                 section called "Risk Factors."

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


                                  RISK FACTORS

               The notes are not secured and are riskier 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 0.25%
Interest on Ordinary Notes       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 Cisco 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., we
                                 may not meet the requirements for listing. Even
                                 if there is a secondary market, it may not
                                 provide enough liquidity to allow you to trade
                                 or sell the notes easily. MS & Co. currently
                                 intends to act as a market maker for the notes,
                                 but is not required to do so.

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

                                 o the market price of Cisco Stock

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

                                 o the dividend rate on the Cisco Stock

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

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

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

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

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

Potential Conflicts of           As calculation agent, MS & Co. will calculate
Interest between You and         how many shares of Cisco Stock you will receive
the Calculation Agent and        in exchange for your notes and what adjustments
Other Affiliates of Ours         should be made to the exchange ratio to reflect
                                 certain corporate and other events. MS & Co.
                                 and other affiliates may carry out hedging
                                 activities related to the notes or to other
                                 instruments, including trading in Cisco Stock
                                 as well as in other instruments related to
                                 Cisco Stock. MS & Co. and some of our
                                 subsidiaries also trade Cisco 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
                                 Cisco Stock and, thereby, the value of the
                                 Cisco Stock or cash you will receive upon
                                 exchange or redemption.

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



                             DESCRIPTION OF NOTES

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

Principal Amount..............   $15,900,000

Maturity Date.................   June 5, 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).............   June 4, 1999

CUSIP.........................   617446DK2

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

Initial Cisco Stock Price.....   $108 per share

Exchange Right................   On any Exchange Date, you will be entitled
                                 upon (i) your completion and delivery to us
                                 and the Calculation Agent of an Official
                                 Notice of Exchange (in the form of Annex A
                                 attached hereto) prior to 11:00 a.m. New York
                                 City time on such date and (ii) delivery on
                                 such date of such notes to the Trustee, to
                                 exchange each $1,000 principal amount of the
                                 Exchangeable Notes due June 5, 2006
                                 (Exchangeable for Shares of Common Stock of
                                 Cisco Systems, Inc.) (the "Notes") for 7.3895
                                 shares (the "Exchange Ratio") of Cisco 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 Cisco
                                 Stock or pay an amount in cash equal to the
                                 Exchange Ratio times the Market Price of
                                 Cisco Stock on the Exchange Date, as
                                 determined by the Calculation Agent, in lieu
                                 of such shares.  Such delivery or payment
                                 will be made 3 Business Days after any
                                 Exchange Date, subject to delivery of such
                                 Notes to the Trustee on the Exchange Date.

                                 Upon any exercise of the Exchange Right, you
                                 will not be entitled to receive any cash
                                 payment representing any accrued Stated OID.
                                 Such accrued Stated OID will be deemed paid
                                 by the Cisco 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 Cisco Stock or
                                 cash to the Trustee for delivery to you.

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

Exchange Ratio ...............   7.3895, subject to adjustment for certain
                                 corporate events relating to Cisco Systems,
                                 Inc.  See "--Antidilution Adjustments" below.

Exchange Date.................   Any Trading Day that falls during the period
                                 beginning September 4, 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 June 4, 2001, we may call the
                                 Notes, in whole but not in part, for
                                 mandatory exchange into Cisco 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 Cisco 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
                                 Cisco Stock or cash to the Trustee for
                                 delivery to you.

                                 Upon an exchange by us (whether payment is to
                                 be made in Cisco 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 Cisco Stock or cash.

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

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

Call Date.....................   The scheduled Trading Day on or after June 4,
                                 2001 specified by us in our notice of
                                 mandatory exchange on which we will deliver
                                 Cisco 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 Cisco Stock on
                                 such Trading Day.

Call Price....................   The table below shows indicative Call Prices
                                 for each $1,000 principal amount of Notes on
                                 June 4, 2001 and at each June 4 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
                                 ---------                         ----------
                                 June 4, 2001.................     $   987.58
                                 June 4, 2002.................     $   990.05
                                 June 4, 2003.................     $   992.53
                                 June 4, 2004.................     $   995.01
                                 June 4, 2005.................     $   997.50
                                 June 4, 2006.................     $   999.99
                                 Maturity.....................     $ 1,000.00


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

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

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

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

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

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

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

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

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

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

                                 1. If Cisco 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 Cisco
                                 Stock.

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

                                 5. If there occurs any reclassification or
                                 change of Cisco Stock, including, without
                                 limitation, as a result of the issuance of
                                 tracking stock by Cisco, or if Cisco 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 Cisco as an entirety
                                 or substantially as an entirety, in each case
                                 as a result of which the holders of Cisco
                                 Stock shall be entitled to receive stock,
                                 other securities or other property or assets
                                 (including, without limitation, cash or other
                                 classes of stock of Cisco) ("Exchange
                                 Property") with respect to or in exchange for
                                 such Cisco Stock, then the holders of the
                                 Notes then outstanding will be entitled
                                 thereafter to exchange such Notes into the
                                 kind and amount of Exchange Property that
                                 they would have owned or been entitled to
                                 receive upon such reclassification, change,
                                 merger, combination, consolidation, sale or
                                 conveyance had such holders exchanged such
                                 Notes for Cisco Stock immediately prior to
                                 any such corporate event, but without
                                 interest thereon.  At such time, no
                                 adjustment will be made to the Exchange Ratio.

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

                                    (i) a suspension, absence or material
                                    limitation of trading of Cisco Stock on
                                    the primary market for Cisco 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 Cisco Stock as a result of which the
                                    reported trading prices for Cisco 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 Cisco Stock, if
                                    available, during the one-half hour period
                                    preceding the close of trading in the
                                    applicable market, in each case as
                                    determined by the Calculation Agent in its
                                    sole discretion; and

                                    (ii) a determination by the Calculation
                                    Agent in its sole discretion that the
                                    event described in clause (i) above
                                    materially interfered with the ability of
                                    the Company or any of our affiliates to
                                    unwind all or a material portion of the
                                    hedge with respect to the Notes.

                                 For purposes of determining whether a Market
                                 Disruption Event has occurred: (1) a
                                 limitation on the hours or number of days of
                                 trading will not constitute a Market
                                 Disruption Event if it results from an
                                 announced change in the regular business
                                 hours of the relevant exchange, (2) a
                                 decision to permanently discontinue trading
                                 in the relevant option contract will not
                                 constitute a Market Disruption Event, (3)
                                 limitations pursuant to 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 Cisco 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 Cisco Stock and
                                 (5) a suspension, absence or material
                                 limitation of trading on the primary
                                 securities market on which options contracts
                                 related to Cisco Stock are traded will not
                                 include any time when such securities market
                                 is itself closed for trading under ordinary
                                 circumstances.

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

Cisco Stock;
Public Information............   Cisco Systems, Inc. and its subsidiaries, is
                                 a leader in networking for the Internet and
                                 creates hardware and software solutions that
                                 link computer networks so that people have
                                 easy access to information without regard to
                                 differences in time, place or type of computer
                                 system.  Cisco 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
                                 Cisco pursuant to the Exchange Act can be
                                 located by reference to Commission file
                                 number 0-18225.  In addition, information
                                 regarding Cisco may be obtained from other
                                 sources including, but not limited to, press
                                 releases, newspaper articles and other
                                 publicly disseminated documents.  We make no
                                 representation or warranty as to the accuracy
                                 or completeness of such reports.

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

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

Historical Information........   The following table sets forth the published
                                 high and low Market Price during 1996, 1997,
                                 1998 and during 1999 through May 27, 1999.
                                 The Market Price on May 27, 1999 was $108.
                                 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
                                 Cisco Stock as an indication of future
                                 performance.  We cannot give any assurance
                                 that the price of Cisco 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

                                       Cisco                  High        Low
                                       -----                  ----        ---
                           (CUSIP 17275R102)
                           1996
                           First Quarter.................   22 7/32     14 17/32
                           Second Quarter................   25 7/16     19 11/16
                           Third Quarter.................   28 11/64    20 15/16
                           Fourth Quarter................   30 1/2      25 39/64
                           1997
                           First Quarter.................   33 9/32     20 15/16
                           Second Quarter................   31 27/64    20 39/64
                           Third Quarter.................   36 27/64    30 23/64
                           Fourth Quarter................   40 3/16     32 23/64
                           1998
                           First Quarter.................   46 3/8      36 11/64
                           Second Quarter................   61 3/8      44 21/64
                           Third Quarter.................   69 19/64    54 37/64
                           Fourth Quarter................   96 1/2      43 7/8
                           1999
                           First Quarter.................  115          95 1/8
                           Second Quarter
                             (through May 27, 1999)......  118 3/4     100

                                 Historical prices have been adjusted for a 2
                                 for 1 stock split of Cisco Stock, which
                                 became effective in the first quarter of
                                 1996, and two 3 for 2 stock splits of Cisco
                                 Stock, which became effective in the fourth
                                 quarter of 1997 and the third quarter of
                                 1998, respectively.  A 2 for 1 stock split of
                                 Cisco Stock, which was declared in the second
                                 quarter of 1999, is expected to become
                                 effective in the second quarter of 1999
                                 subsequent to the date of this pricing
                                 supplement.

                                 We make no representation as to the amount of
                                 dividends, if any, that Cisco will pay in the
                                 future.  In any event, as a holder of a Note,
                                 you will not be entitled to receive
                                 dividends, if any, that may be payable on
                                 Cisco 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 Cisco 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 Cisco Stock.  Our purchase activity could
                                 potentially have increased the price of Cisco
                                 Stock, and therefore effectively have
                                 increased the level to which Cisco Stock must
                                 rise before you would receive an amount of
                                 Cisco 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 Cisco Stock,
                                 options contracts on Cisco 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 Cisco
                                 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 Cisco 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 Cisco 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 Cisco Stock.
                                 Thus, any insurance company, pension or
                                 employee benefit plan or entity holding
                                 assets of such a plan proposing to invest in
                                 the Notes should consult with its legal
                                 counsel prior to such investment.

United States Federal
Taxation......................   The Notes are Optionally Exchangeable Notes
                                 and investors should refer to the discussion
                                 under "United States Federal
                                 Taxation--Notes--Optionally Exchangeable
                                 Notes" in the accompanying Prospectus
                                 Supplement.  In connection with the
                                 discussion thereunder, we have determined
                                 that the "comparable yield" is an annual rate
                                 of 6.42%, 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 $1529.62.

                                 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 September 4, 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 June 5, 2006 (Exchangeable for
Shares of Common Stock of Cisco Systems, Inc.) of Morgan Stanley Dean Witter &
Co. (CUSIP No. 617446DK2) (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) June 5, 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. 11 dated May 27, 1999 (the "Pricing Supplement") to the
Prospectus Supplement dated May 6, 1999 and the Prospectus dated May 5, 1999
related to Registration Statement No. 333-75289.  Capitalized terms not
defined herein have the meanings given to such terms in the Pricing
Supplement.  Please date and acknowledge receipt of this notice in the place
provided below on the date of receipt, and fax a copy to the fax number
indicated, whereupon the Company will deliver, at its sole option, shares of
the Common Stock of Cisco Systems, Inc. or cash 3 Business Days after the
Exchange Date in accordance with the terms of the Notes, as described in the
Pricing Supplement.

                                    Very truly yours,


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


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


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


                                    $
                                      ------------------------------------------
                                      Principal Amount of Notes surrendered
                                      for exchange

Receipt of the above Official
Notice of Exchange is hereby acknowledged

MORGAN STANLEY DEAN WITTER & CO., as Issuer

MORGAN STANLEY & CO. INCORPORATED, as Calculation Agent

By MORGAN STANLEY & CO. INCORPORATED, as Calculation Agent


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

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


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