LONDON, 22 June 2006 – Aon UK has today announced that it will move to a full electronic trading capability during 2006 for its specialist insurance and reinsurance businesses.

In a phased approach, Aon will begin to transition its portfolio of specialist insurance and reinsurance business from physical to electronic distribution in July this year. This means that in the near future all contracts and endorsements distributed by Aon in London can be signed on-line, not on paper.

The implications for insurers and reinsurers are far reaching.  They will now be able to receive electronic notification of the incoming offers, agreed quotes and signed lines directly into their underwriting systems.  This will provide greater transparency and certainty around the contract, remove much of the re-keying associated with the current process and also significantly reduce the possible degradation of information provided to underwriters.

These greatly improved processes will give Aon’s clients around the world easier access to London underwriters.

Aon has developed its own technologies for preparing the electronic submission and will distribute risks from its Concert / Aon Broking Connections (ABC) platform using internationally compliant ACORD messaging.

“We have made significant progress developing agreed standards with the G6 group of underwriters and are now in a position to optimise the use of these standards. Our infrastructure gives insurers and reinsurers connectivity options suited to their own strategy,” explained Ian Summers, director of change strategy at Aon. “Aon's technology can talk either direct to insurers or reinsurers or via a service provider of their choice, all to the benefit of our clients.”

Aon is working with a number of hub providers and, in the case of the RI3K electronic market place, has simplified the interface and agreed a substantially reduced pricing tariff for underwriters to reflect the increased volumes Aon believes this will generate.

Aon’s initiative builds on its successful ABC programme which has already built post placement links to clients and markets, recently passing the 100,000 mark for presentation of electronic claims files to the market.

“The technology is now in place and Aon is ideally positioned to help the market make the transition from paper processes to the vastly more efficient electronically supported processes. We are proud to continue our leadership in the modernisation of the London market,” concluded Mr Summers.

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.