AOC Aon Corp.

Companies Selected Best Reinsurance Intermediary, Best Employee Benefit Consulting Firm CHICAGO, Aug. 21 /PRNewswire-FirstCall/ -- Aon Corporation (NYSE:AOC) today announced readers of Business Insurance magazine have named Aon Re Global the world's best reinsurance intermediary, and Aon Consulting Worldwide the best employee benefit consulting firm. (Logo: http://www.newscom.com/cgi-bin/prnh/20041215/CGW049LOGO ) Business Insurance invited subscribers to select companies they believe offer the best service, value, quality and innovation. The full list of awardees is published in the magazine's Aug. 21 edition. "Our colleagues with Aon Re Global and Aon Consulting Worldwide, consistent with Aon overall, strive to deliver the most client-focused, distinctive reinsurance brokerage and human capital consulting services in the world," said Aon Corporation President and Chief Executive Officer Greg Case. "This recognition by the readers of Business Insurance is an additional incentive to keep aiming higher and delivering more on behalf of our clients." In July, a Business Insurance ranking of revenues earned in 2005 from commercial retail, wholesale, reinsurance and personal lines brokerage showed Aon as largest in the world. While Business Insurance did not count consulting revenues in its ranking, Aon continues to lead the industry when consulting revenues are included. Business Insurance's ranking was based on information supplied by each company. Business Insurance is published weekly by Crain Communications Inc. About Aon Aon Re Global is the reinsurance and captive services subsidiary of Aon Corporation, providing brokerage and consultancy services to insurance companies and captives through its network of offices throughout the world. Aon Consulting is among the top global human capital consulting firms, with 2005 revenues of $1.255 billion and 6,800 professionals in 117 offices worldwide. Aon Consulting delivers integrated consulting solutions to help clients with employee benefits, human resources outsourcing, compensation, communication and management consulting. 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. For more information, contact: Rahsaan Johnson, Aon Corporation/Aon Re Global 312.381.2684 Joe Micucci, Aon Corporation/Aon Consulting Worldwide 312.381.4786 Al Orendorff, Aon Corporation/Aon Risk Services 312.381.3153 This press release contains certain statements related to future results, or states our intentions, beliefs and expectations or predictions for the future which are forward-looking statements as that term is defined in the Private Securities Litigation Reform Act of 1995. These forward-looking statements are subject to certain risks and uncertainties that could cause actual results to differ materially from either historical or anticipated results depending on a variety of factors. Potential factors that could impact results include: general economic conditions in different countries in which we do business around the world, changes in global equity and fixed income markets that could affect the return on invested assets, fluctuations in exchange and interest rates that could influence revenue and expense, rating agency actions that could affect our ability to borrow funds, funding of our various pension plans, changes in the competitive environment, our ability to implement restructuring initiatives and other initiatives intended to yield cost savings, our ability to execute the stock repurchase program, changes in commercial property and casualty markets and commercial premium rates that could impact revenues, changes in revenues and earnings due to the elimination of contingent commissions, other uncertainties surrounding a new compensation model, the impact of investigations brought by state attorneys general, state insurance regulators, federal prosecutors, and federal regulators, the impact of class actions and individual lawsuits including client class actions, securities class actions, derivative actions, and ERISA class actions, the cost of resolution of other contingent liabilities and loss contingencies, and the difference in ultimate paid claims in our underwriting companies from actuarial estimates. Further information concerning the Company and its business, including factors that potentially could materially affect the Company's financial results, is contained in the Company's filings with the Securities and Exchange Commission. http://www.newscom.com/cgi-bin/prnh/20041215/CGW049LOGO http://photoarchive.ap.org/ DATASOURCE: Aon Corporation CONTACT: Rahsaan Johnson, Aon Corporation, Aon Re Global, +1-312-381-2684, or , or Joe Micucci, Aon Corporation, Aon Consulting Worldwide, +1-312-381-4786, or , or Al Orendorff, Aon Corporation, Aon Risk Services, +1-312-381-3153, or Web site: http://www.aon.com/

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