LONDON, 9 June 2006 – Aon’s electronic document repository (DocEx), launched in January 2003 to allow all parties in the insurance process to access electronic claims documentation simultaneously, has passed the 100,000 mark in electronic claims files (ECF’s) created.

As a major driver behind the London Market ECF evolution, DocEx currently has 3,500 documents viewed every month by 70 reinsurers and insurers worldwide, helping to greatly reduce the time and effort behind the processing of a claim. DocEx is also being used in other parts of the insurance process including accounting and settlement and can potentially be also used to support the placing of insurance policies.

Ian Summers, director of change strategy at Aon, said: “Our 100,000^th ECF is a major milestone and finally belies the myth that electronic trading in the London and international insurance markets is a pipe dream. It is here, and it is now.

“We are working very closely with all our insurance markets, including Lloyd’s, where Docex will integrate electronically with their Insurers’ Market Repository allowing automatic download of documentation and eliminating any duplication of effort. We now have the infrastructure in place to work with any system worldwide provided they conform to ACORD standards and while document repositories are only one stage in the transition to full electronic trading we are seeing tremendous progress being made.”

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.