PROSPECTUS Dated May 5, 1999 Pricing Supplement No. 42 to
PROSPECTUS SUPPLEMENT Registration Statement No. 333-75289
Dated May 6, 1999 March 7, 2000
Rule 424(b)(3)
Morgan Stanley Dean Witter & Co.
MEDIUM-TERM NOTES, SERIES C
Senior Floating Rate Notes
-----------------------
We will not redeem these Medium-Term Notes, Series C (Senior Floating Rate
Notes) prior to the maturity date. We describe the basic features of this type
of note in the section called "Description of Notes--Floating Rate Notes" in
the accompanying prospectus supplement, subject to and as modified by the
provisions described below.
Principal Amount: $50,000,000
Maturity Date: September 14, 2001
Interest Accrual
Date: March 14, 2000
Interest Payment
Dates: Each March 14, June
14, September 14, and
December 14,
commencing June 14,
2000
Initial Interest Rate: To be determined two
London banking days
prior to the Original
Issue Date
Base Rate: LIBOR
Index Maturity: 3 Months
Spread
(Plus or Minus): Plus 0.04% per annum
Index Currency: U.S. Dollars
Interest Payment
Period: Quarterly
Specified Currency: U.S. Dollars
Issue Price: 100%
Settlement Date
(Original Issue Date): March 14, 2000
Initial Interest Reset
Date: June 14, 2000
Interest Reset Dates: Same as Interest
Payment Dates
Interest Reset Period: Quarterly
Interest Determination
Dates: Two London banking
days prior to each
Interest Reset Date
Reporting Service: Telerate (Page 3750)
Book Entry Note or
Certificated Note: Book Entry Note
Senior Note or
Subordinated Note: Senior Note
Agent: Morgan Stanley &
Co. Incorporated
Calculation Agent: The Chase
Manhattan Bank
Minimum Denomination: $1,000
CUSIP: 61745EPB1
Terms not defined above have the meanings given to such terms in the
accompanying prospectus supplement.
MORGAN STANLEY DEAN WITTER
