Aon Consulting, the human capital and management consulting organization of Aon Corporation (NYSE: AOC), announced today that Robert Middleton has been appointed chief executive of Aon Consulting in the U.K., taking over from Ron Amy, who will remain chairman of Aon Consulting U.K., and assume greater responsibilities in providing global leadership. Additionally, Baljit (Bal) Dail has been named global chief administrative officer, a newly-created position within the organization. Both Amy and Dail will continue to report to Andrew Appel, chief executive officer of Aon Consulting.

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"Achieving Aon Consulting's goals relies on our ability to deliver on a number of key priorities worldwide," said Appel. "Robert, Ron and Bal are charged with developing strategies to enhance client service, attract and retain unmatched talent, pursue operational excellence, and build innovation and thought leadership on a global basis."

Middleton is currently managing director of Aon Consulting in the U.K., a leading pension, benefits and HR consulting firm. He has been with Aon for 10 years, and in his current role since 2003. Middleton led the U.K. consulting business through a period of significant change, resulting in increased profitability and sales.

Middleton succeeds Ron Amy, who has been with Aon since 1996. In addition to continuing in his current role as chairman of Aon Consulting U.K., Amy will build a team designed to provide global benefit services to multinational organizations. He also remains a leader in Aon Consulting's efforts to partner with global large corporations, and continues to serve as chairman and chief executive of Aon Asset Management Ltd., and as a member of the Aon U.K. Board of Directors.

Dail becomes global chief administrative officer, moving from his current role as executive vice president of global strategy, a position he held since joining the organization from McKinsey & Company in 2005. Dail will continue to lead the Aon Consulting global strategy team, while also heading the newly established global program management office, which is focused on driving execution of the overall strategy. In addition, Dail will be responsible for Aon Consulting's global technology, marketing, talent management and communication functions.

"These three gentlemen have each made an exceptional impact on our organization," said Appel. "I look forward to continuing to work with them, as they take on their new roles in helping us achieve even greater success globally."

  For more information, contact:
  Nessa Kearney, Aon Press Office London, + 44 207 882 0067,
  Nessa.Kearney@aon.co.uk

  -or-

  Joe Micucci, Aon Consulting, 312-381-4786, joe_micucci@aon.com

  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 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.

Aon Consulting is among the top global human resources consulting firms, with 2005 revenues of $1.255 billion and 7,000 professionals in 120 offices throughout the world. Aon Consulting delivers integrated consulting solutions to help clients with employee benefits, human resources outsourcing, compensation, communication and management consulting.

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.

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SOURCE: Aon Corporation

CONTACT: Nessa Kearney of Aon Press Office London, + 44 207 882 0067,
Nessa.Kearney@aon.co.uk , or Joe Micucci of Aon Consulting, +1-312-381-4786,
joe_micucci@aon.com

Web site: http://www.aon.com/