MMC TO HOLD INVESTOR DAY ON DECEMBER 7, 2006

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NEW YORK, NEW YORK, November 30, 2006 — As previously announced, Marsh & McLennan Companies, Inc. (MMC) will hold an Investor Day on Thursday, December 7, 2006. MMC's senior management will discuss the company's strategic outlook, financial performance, and growth initiatives.

The event will be hosted by Michael G. Cherkasky, president and chief executive officer of MMC, and include presentations by senior executives of MMC and its operating companies.

Due to space constraints, attendance has been limited to invited members of the investment community. The live audio webcast of the event and accompanying slide presentations, which will begin at 8:00 a.m. ET and conclude at approximately 2:00 p.m., may be accessed from MMC's website at www.mmc.com. The webcast and slide presentations will be archived following the event at the same web address.

MMC is a global professional services firm with annual revenues of approximately $12 billion. It is the parent company of Marsh, the world's leading risk and insurance services firm; Guy Carpenter, the world's leading risk and reinsurance specialist; Kroll, the world's leading risk consulting company; Mercer, a major global provider of human resource and specialty consulting services; and Putnam Investments, one of the largest investment management companies in the United States. Approximately 55,000 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.