AOC Aon Corp.

CHICAGO, March 13 /PRNewswire-FirstCall/ -- Aon Consulting, the human capital consulting organization of Aon Corporation (NYSE:AOC), announced today that its subsidiary, McLagan Partners, has completed the acquisition of Z/Yen Limited, a London-based market intelligence firm. Z/Yen Limited is a subsidiary of the Z/Yen Group, and all other work undertaken by the Z/Yen Group such as management consultancy, research and predictive software, are unaffected by this change. The terms of the transaction are not disclosed. (Logo: http://www.newscom.com/cgi-bin/prnh/20041215/CGW049LOGO ) McLagan Partners, a leading pay and performance organization, offers proprietary market studies and consulting services to firms in the financial services industry. The acquisition of Z/Yen Limited will complement McLagan's existing services by providing cost per trade analysis and customer perception studies for the capital markets. "The acquisition of Z/Yen Limited will provide tremendous value to our clients through significant enhancement of our services," said Andrew Appel, chief executive officer of Aon Consulting Worldwide. "We are looking forward to expanding our global business opportunities in the financial services market with the addition of these capabilities." "Since 1999, Z/Yen Limited has measured cost per trade and operational efficiency across the capital markets industry and worked with over 30 major banks," said Jeremy Smith, head of Z/Yen Limited. "We believe that integration with McLagan Partners will enable us to extend our reach globally and provide a more comprehensive analytical service to our clients." "The sale of Z/Yen Limited makes strategic and operational sense for all parties, and we are jointly delighted with this outcome," said Michael Mainelli, executive chairman of the Z/Yen Group. For more information contact: Sara Carlson 312-381-5045 About Aon 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 43,000 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. Aon Consulting Worldwide ( http://www.aon.com/hcc ) is among the top global human capital consulting firms, with 2006 revenues of $1.282 billion and 6,500 professionals in 117 offices worldwide. Aon Consulting is reshaping the workplace of the future through benefits, talent management and rewards strategies and solutions. In August 2006, Aon Consulting was named the best employee benefit consulting firm by the readers of Business Insurance magazine. 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, our ability to obtain regulatory or legislative changes to permit continuous sales of our supplemental Medicare health product, 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, ERISA class actions, the impact of the analysis of practices relating to stock options, 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: Sara Carlson of Aon Corporation, +1-312-381-5045, or Web site: http://www.aon.com/ http://www.aon.com/hcc

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