AOC Aon Corp.

CHICAGO, Oct. 16 /PRNewswire-FirstCall/ -- Aon Corporation (NYSE:AOC) plans to announce third quarter 2009 results on Friday, October 30, 2009 in a news release to be issued before the market opens. Greg Case, president and CEO will host a conference call at 7:30 am Central Time on Friday, October 30, 2009. The conference call will be broadcast live through Aon's website at http://www.aon.com/. Windows Media Player is required to listen to this webcast. A replay will be available shortly after the live webcast. The earnings release will be available on Aon's web site at http://www.aon.com/. About Aon Aon Corporation (NYSE:AOC) is the leading global provider of risk management services, insurance and reinsurance brokerage, and human capital consulting. Through its more than 37,000 colleagues worldwide, Aon readily delivers distinctive client value via innovative and effective risk management and workforce productivity solutions. Aon's industry-leading global resources and technical expertise are delivered locally through more than 500 offices in more than 120 countries. Named the world's best broker by Euromoney magazine's 2008 and 2009 Insurance Survey, Aon also ranked highest on Business Insurance's listing of the world's largest insurance brokers based on commercial retail, wholesale, reinsurance and personal lines brokerage revenues in 2008 and 2009. A.M. Best deemed Aon the number one insurance broker based on brokerage revenues in 2007, 2008, and 2009, and Aon was voted best insurance intermediary, best reinsurance intermediary and best employee benefits consulting firm in 2007 and 2008 by the readers of Business Insurance. For more information on Aon, log onto http://www.aon.com/. Investor Contact: Media Contact: Scott Malchow David Prosperi Vice President, Vice President, Investor Relations Global Public Relations 312-381-3983 312-381-2485 DATASOURCE: Aon Corporation CONTACT: Investors, Scott Malchow, Vice President, Investor Relations, +1-312-381-3983, or Media, David Prosperi, Vice President, Global Public Relations, +1-312-381-2485, both of Aon Corporation Web Site: http://www.aon.com/

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