AOC Aon Corp.

CHICAGO, Jan. 16 /PRNewswire-FirstCall/ -- Aon Corporation (NYSE:AOC) will report its fourth quarter results after the market closes on Thursday, February 9, 2006. The earnings release will be available on Aon's web site at http://www.aon.com/ . Gregory C. Case, president and CEO, will host a webcast discussion of the quarter's results on Friday, February 10, 2006 at 10:00 AM Central Time, which 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. 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 47,000 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. Investor Contact: Craig Streem Corporate Vice President, Investor Relations 312.381.3983 Media Contact: Al Orendorff Director, Public Relations 312.381.3153 First Call Analyst: FCMN Contact: elena_sioson@aon.com DATASOURCE: Aon Corporation CONTACT: Investors, Craig Streem, Corporate Vice President, Investor Relations, +1-312-381-3983, or Media, Al Orendorff, Director, Public Relations, +1-312-381-3153, both of Aon Corporation Web site: http://www.aon.com/

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