AOC Aon Corp.

CHICAGO, May 4 /PRNewswire-FirstCall/ -- Aon Corporation (NYSE:AOC) today announced that Greg Case, President and CEO, will present at the Barclays Capital Financial Services Conference in London on Wednesday, May 6, 2009 at 10:05 a.m. London Time. Interested parties may access an audio webcast of the presentation at http://www.aon.com/. A replay of the webcast will be available within 24 hours of the presentation. 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. A.M. Best deemed Aon the number one insurance broker based on brokerage revenues in 2007 and 2008, 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, Investor Vice President, Global Public Relations 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 Web Site: http://www.aon.com/

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