LONDON, 3 October 2006 - Aon, a leading insurance broker and risk management consultant, today announced the appointment of Clive James to Group Managing Director of Aon Insurance Managers (AIM) Global, the captive management division of Aon Captive Services Group (ACSG).

Clive is charged with continuing to oversee the growth and development of Aon Insurance Managers as the world’s largest captive management operation. AIM is the world leader in captive management provision with over 1,350 captives, 250 cells and an expert staff base of 500, managing an annual premium income of $20 billion and assets of $50 billion.

Clive was previously responsible for AIM's operations in Europe and Asia and has 18 years’ experience within captive management at Aon. He has helped drive expansion of the business from 10 offices to 29 locations and grown the client base ten fold, from 150 to 1500. Clive has been part of the team that has established Aon’s presence in nearly half of the sixty captive jurisdictions that exist globally.

Commenting on the latest appointment to the group, Stephen Cross, CEO of Aon Captives Services Group said, “We are delighted to have Clive James at the helm of our operations for Aon Insurance Managers. We have seen tremendous growth over the last five years, particularly in some of the emerging markets in Asia and the Middle East which has established AIM as the market leader in captive management. We will be looking to Clive’s deep understanding and experience in this space to leverage our position in the global market.”

Speaking in his new capacity, Clive James said: “I am delighted to have been appointed as Group Managing Director of AIM globally. The captives market is in a state of evolution, particularly in the light of emerging market growth in countries such as China. This is an exciting market in which to be operating today and I am grateful for the opportunity to continue the successful growth of Aon in this area.”

Notes to editor:

About Aon

Aon Corporation 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.

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.