United States
                       Securities and Exchange Commission
                             Washington, D.C. 20549


                                  SCHEDULE 14A
                                 (Rule 14a-101)

                     INFORMATION REQUIRED IN PROXY STATEMENT
                            SCHEDULE 14A INFORMATION

           Proxy Statement Pursuant to Section 14(a) of the Securities
                              Exchange Act of 1934


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                        Marsh & McLennan Companies, Inc.
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                (Name of Registrant as Specified In Its Charter)

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Attached  hereto is a letter to employees from Michael A. Petrullo,  senior vice
president and chief administrative officer  of  Marsh & McLennan Companies, Inc.
("MMC")  relating to a proposal to be considered by  stockholders  of MMC at the
2005 Annual Meeting of Stockholders to be held on May 19, 2005 (the "2005 Annual
Meeting").  The proposal  concerns  amendments to certain employee stock benefit
plans  that  would  permit  MMC to make an offer to its  employee  optionholders
(other than it's most senior executive officers)  to tender  certain outstanding
stock  options in  exchange  for  stock options to  purchase a lesser  number of
shares of MMC common stock.


MMC has not commenced the exchange offer referred to in this communication. When
the exchange offer is commenced,  MMC will provide eligible  optionholders  with
written materials explaining the terms and conditions and timing of the exchange
offer.  The tender offer  materials and the proxy  statement for the 2005 Annual
Meeting will contain  important  information for optionholders and stockholders,
respectively, and should be read carefully by them prior to tendering or voting.
The  proxy statement  has been filed  by MMC  with the Securities  and  Exchange
Commission.  The tender offer materials will be filed by MMC with the Securities
and Exchange Commission.  These written  materials  and  other  documents may be
obtained free of charge from the Securities and Exchange Commission's website at
www.sec.gov.

MMC  stockholders  may obtain a written copy of the proxy statement and eligible
MMC  optionholders  may obtain free of charge a written copy of the tender offer
statement,  when  available,  by contacting  MMC Corporate  Development at (212)
345-5475.



Attachment:

(1) Letter  to  Employees  from  Michael A. Petrullo,  senior vice president and
chief administrative officer of MMC.





                                                                  Attachment (1)



                                                Michael A. Petrullo
[GRAPHIC OMITTED]

                                                Marsh & McLennan Companies, Inc.
                                                1166 Avenue of the Americas
                                                New York, New York 10036
                                                212 345 1436  Fax  212 345 1978
                                                Michael.Petrullo@MMC.com
                                                www.mmc.com




April 13, 2005



To All MMC Optionholders:


On March 1, 2005,  MMC  announced  its proposal to offer a stock option exchange
program for certain outstanding  options held by active employees.  The proposal
is described in detail in the 2005 MMC Proxy Statement.  In short,  options that
are 25% or more "underwater" will be eligible for exchange.  Pending shareholder
approval  at  the  2005  Annual  Meeting,  which  is  being  held on  May 19, we
anticipate  communicating  the specifics of the offer to those active  employees
holding eligible  options within a few days of the meeting.  Holders of eligible
options will receive specific  information on the exchange process, the exchange
timeframe,  the tax  implications of the exchange,  the options eligible for the
exchange  and the  exchange  ratios.  If your  options  do not  qualify  for the
exchange,  you will not  receive  this  information.  In any case,  no action is
required on your part at this time.

The intent of the proposed  exchange is to ensure that outstanding stock options
serve as motivation  and retention  tools to employees  whom the Company and its
shareholders  rely upon to move the Company  forward.  We believe a stock option
exchange program to replace eligible  options on a  value-for-value  basis is in
the interests of optionholders, shareholders and our Company.

To recap,  some key  points  about the stock  option  exchange  proposal  are as
follows:

       o      MMC's most senior executive officers are excluded from the
              exchange program.
       o      Only stock options underwater by 25% or more would be eligible for
              the exchange program. (For example, options with an exercise price
              of $46.14 will be eligible for exchange if the market price of MMC
              stock is $34.605 or less at the selected date.)
       o      Exchange ratios would be set with the intention that optionholders
              receive new stock options that have a value that is equal to 90%
              of the value of the exchanged stock options.
       o      The exercise price of new options will be equal to the fair market
              value of MMC common stock at the time of the exchange.





[GRAPHIC OMITTED]

Page 2
April 13, 2005




Thank you for your continuing contributions to our Company's success.

Michael A. Petrullo
Senior Vice President & Chief Administrative Officer
Marsh & McLennan Companies, Inc.


MMC has not commenced the exchange offer referred to in this communication. When
the exchange offer is commenced,  MMC will provide eligible  optionholders  with
written materials explaining the terms and conditions and timing of the exchange
offer.  The tender offer  materials and the proxy  statement for the 2005 Annual
Meeting will contain  important  information for optionholders and stockholders,
respectively, and should be read carefully by them prior to tendering or voting.
The  proxy statement  has been filed  by  MMC with  the  Securities and Exchange
Commission.  The tender offer materials will be filed by MMC with the Securities
and  Exchange Commission.  These  written materials  and  other documents may be
obtained free of charge from the Securities and Exchange Commission's website at
www.sec.gov.

MMC  stockholders  may obtain a written copy of the proxy statement and eligible
MMC  optionholders  may obtain free of charge a written copy of the tender offer
statement,  when  available,  by contacting  MMC Corporate  Development at (212)
345-5475.