MMC TO HOLD CONFERENCE CALL ON OCTOBER 27 TO DISCUSS THIRD QUARTER 2004 RESULTS

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NEW YORK, NEW YORK, October 13, 2004 - Marsh & McLennan Companies, Inc. (MMC) plans to announce third quarter results on Wednesday, October 27, 2004 in a news release that will be issued before the market opens. The release will also be available on MMC's website at www.mmc.com.

Jeffrey W. Greenberg, chairman and chief executive officer of MMC, and Sandra S. Wijnberg, senior vice president and chief financial officer, will lead a discussion on financial results, including a question and answer period, at 11 a.m. EDT on October 27.

To participate in the live teleconference, please dial (888) 578-6632. Callers from outside the United States should dial (719) 955-1565. The live audio webcast (which will be listen-only) may be accessed at www.mmc.com/cc.html. A replay of the webcast will be available beginning approximately two hours after the event.

A continuous telephone replay will be available beginning at 2 p.m. EDT, Wednesday, October 27 and continuing through 11 p.m. EST, Wednesday, November 3. To listen to the replay, please dial (888) 203-1112. Callers from outside the United States may listen to the replay by dialing (719) 457-0820. The access code for both numbers is 980653.

MMC is a global professional services firm with annual revenues exceeding $11 billion. It is the parent company of Marsh Inc., the world's leading risk and insurance services firm; Putnam Investments, one of the largest investment management companies in the United States; and Mercer Inc., a major global provider of consulting services. More than 63,000 employees provide analysis, advice, and transactional capabilities to clients in over 100 countries. Its stock (ticker symbol: MMC) is listed on the New York, Chicago, Pacific, and London stock exchanges. MMC's website address is www.mmc.com.