Floating Rate Subordinated Note (2002)Full Document 

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     Unless this certificate is presented by an authorized representative of
The Depository Trust Company (55 Water Street, New York, New York) to the
issuer or its agent for registration of transfer, exchange or payment, and any
certificate issued is registered in the name of Cede & Co. or such other name
as requested by an authorized representative of The Depository Trust Company
and any payment is made to Cede & Co., ANY TRANSFER, PLEDGE OR OTHER USE HEREOF
FOR VALUE OR OTHERWISE BY OR TO ANY PERSON IS WRONGFUL since the registered
owner hereof, Cede & Co., has an interest herein.(1)

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     (1) Applies only if this Note is a Registered Global Security.


<PAGE>


                        MORGAN STANLEY DEAN WITTER & CO.
                 SUBORDINATED GLOBAL MEDIUM-TERM NOTE, SERIES C
                                (Floating Rate)

<TABLE>
-----------------------------------------------------------------------------------------------------
<S>                              <C>                                 <C>
BASE RATE:                       ORIGINAL ISSUE DATE:                MATURITY DATE:
-----------------------------------------------------------------------------------------------------
INDEX MATURITY:                  INTEREST ACCRUAL DATE:              INTEREST PAYMENT DATE(S):
-----------------------------------------------------------------------------------------------------
SPREAD (PLUS OR MINUS):          INITIAL INTEREST RATE:              INTEREST PAYMENT PERIOD:
-----------------------------------------------------------------------------------------------------
SPREAD MULTIPLIER:               INITIAL INTEREST RESET              INTEREST RESET PERIOD:
                                    DATE:
-----------------------------------------------------------------------------------------------------
REPORTING SERVICE:               MAXIMUM INTEREST RATE:              INTEREST RESET DATE(S):
-----------------------------------------------------------------------------------------------------
INDEX CURRENCY:                  MINIMUM INTEREST RATE:              CALCULATION AGENT:
-----------------------------------------------------------------------------------------------------
EXCHANGE RATE AGENT:             INITIAL REDEMPTION DATE:            SPECIFIED CURRENCY:
-----------------------------------------------------------------------------------------------------
                                 INITIAL REDEMPTION                  IF SPECIFIED CURRENCY
                                    PERCENTAGE:                         OTHER THAN U.S. DOLLARS,
                                                                        OPTION TO ELECT PAYMENT
                                                                        IN U.S. DOLLARS:  [YES](2)
-----------------------------------------------------------------------------------------------------
                                 ANNUAL REDEMPTION                   DESIGNATED CMT TELERATE
                                    PERCENTAGE REDUCTION:               PAGE:
-----------------------------------------------------------------------------------------------------
                                 OPTIONAL REPAYMENT                  DESIGNATED CMT MATURITY
                                    DATE(S):                            INDEX:
-----------------------------------------------------------------------------------------------------
OTHER PROVISIONS:                REDEMPTION NOTICE PERIOD:(3)
-----------------------------------------------------------------------------------------------------
                                 TAX REDEMPTION AND
                                 PAYMENT OF ADDITIONAL
                                 AMOUNTS: NO(4)
-----------------------------------------------------------------------------------------------------
                                 IF YES, STATE INITIAL
                                 OFFERING DATE: N/A
=====================================================================================================
</TABLE>

     Morgan Stanley Dean Witter & Co., a Delaware corporation (together with
its successors and assigns, the "Issuer"), for value received, hereby promises
to pay to,                    or registered


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     (2) Applies if this is a Registered Global Security, unless new
arrangements are made with DTC outside of existing Letters of Representations.

     (3) Applicable if other than 30-60 calendar days. If this is a Registered
Global Security, minimum notice period is [20] calendar days [current DTC
limitation].

     (4) Default provision in NO. Indicate YES only for certain notes issued on
a global basis if specified in pricing supplement.


                                       2
<PAGE>


assignees, the principal [sum of ](5) [amount specified in Schedule A hereto](6)
on the Maturity Date specified above (except to the extent redeemed or repaid
prior to maturity) and to pay interest thereon from and including the Interest
Accrual Date specified above at a rate per annum equal to the Initial Interest
Rate specified above until the Initial Interest Reset Date specified above, and
thereafter at a rate per annum determined in accordance with the provisions
specified on the reverse hereof until the principal hereof is paid or duly made
available for payment. The Issuer will pay interest in arrears weekly, monthly,
quarterly, semiannually or annually as specified above as the Interest Payment
Period on each Interest Payment Date (as specified above), commencing with the
first Interest Payment Date next succeeding the Interest Accrual Date specified
above, and on the Maturity Date (or any redemption or repayment date);
provided, however, that if the Interest Accrual Date occurs between a Record
Date, as defined below, and the next succeeding Interest Payment Date, interest
payments will commence on the second Interest Payment Date succeeding the
Interest Accrual Date to the registered holder of this Note on the Record Date
with respect to such second Interest Payment Date; and provided, further, that
if an Interest Payment Date (other than the Maturity Date or redemption or
repayment date) would fall on a day that is not a Business Day, as defined on
the reverse hereof, such Interest Payment Date shall be the following day that
is a Business Day, except that if the Base Rate specified above is LIBOR or
EURIBOR and such next Business Day falls in the next calendar month, such
Interest Payment Date shall be the immediately preceding day that is a Business
Day; and provided, further, that if the Maturity Date or redemption or
repayment date would fall on a day that is not a Business Day, such payment
shall be made on the following day that is a Business Day and no interest shall
accrue for the period from and after such Maturity Date or redemption or
repayment date.

     Interest on this Note will accrue from and including the most recent date
to which interest has been paid or duly provided for, or, if no interest has
been paid or duly provided for, from and including the Interest Accrual Date,
until but excluding the date the principal hereof has been paid or duly made
available for payment. The interest so payable, and punctually paid or duly
provided for, on any Interest Payment Date will, subject to certain exceptions

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