AOC Aon Corp.

CHICAGO, June 21 /PRNewswire-FirstCall/ -- Aon Corporation (NYSE:AOC) announced today that Gregory C. Case, President and CEO of Aon Corporation, will present at the 26th Annual William Blair Growth Stock Conference in Chicago on Tuesday, June 27, 2006 from 11:10 to 11:40 A.M. Central Time. Mr. Case's presentation will be webcast live at the following web address: http://www.wsw.com/webcast/blair6/aoc/ Aon Corporation ( http://www.aon.com/ ) is a leading provider of risk management services, insurance and reinsurance brokerage, human capital and management consulting, and specialty insurance underwriting. There are 46,000 employees working in Aon's 500 offices in more than 120 countries. Backed by broad resources, industry knowledge and technical expertise, Aon professionals help a wide range of clients develop effective risk management and workforce productivity solutions. It should be noted that Mr. Case's remarks may contain forward-looking statements. Please refer to the Aon Annual Report on Form 10-K for the year ended December 31, 2005 and its past and future filings and reports filed with the Securities and Exchange Commission for a description of the business environment in which Aon operates and the important factors that may affect its business. Aon is not under any obligation to (and expressly disclaims any such obligation to) update or alter its forward-looking statements whether as a result of new information, future events or otherwise. Investor Contact: Julie Ann Kotowski Investor Relations 312.381.3318 Media Contact: Al Orendorff Director, Public Relations 312.381.3153 DATASOURCE: Aon Corporation CONTACT: Investors, Julie Ann Kotowski, Investor Relations, +1-312-381-3318, or Media, Al Orendorff, Director, Public Relations, +1-312-381-3153, both of Aon Corporation Web site: http://www.aon.com/ http://www.wsw.com/webcast/blair6/aoc

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