London/Chicago – 9 February 2005 – Aon Corporation announced today that it has entered into an agreement with Le Foyer and Kredietbank to transfer the business of Gecalux S.A. Luxembourg, Gecalux Switzerland A.G. and Gecasuisse A.G. The Gecalux business, which represents in excess of 40 captive clients and a number of consulting clients, will be managed by Aon’s specialist captive management and consulting arm, Aon Captive Services Group (ACSG). Gecalux’s 28 employees will also join Aon as part of the deal.

Stephen Cross, CEO of Aon Captive Services Group, said: “This is an important step for Aon’s continuing development as a center of excellence in the captive management and risk financing arena. Our existing Luxembourg operation will be combined with the Gecalux business and will represent the first Aon operation to deliver captive management, risk management, and risk finance consulting services from one location."

“The deal will significantly expand our rate of growth and better enable us to service clients throughout continental Europe,” Cross added.

Notes to Editors

About Aon

Aon Corporation (www.aon.com) is a leading provider of risk management services, insurance and reinsurance brokerage, human capital and management consulting, and specialty insurance underwriting. The company employs approximately 52,000 professionals in its 600 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.

About Aon Captive Services

Aon Captive Services Group (a division of Aon’s UK arm) provides captive and risk financing solutions. With more than 500 staff and offices worldwide, the division is split into two businesses: Aon Insurance Managers, which provides captive management services; and IRMG, which provides risk finance, captive and ART consulting;

Aon Insurance Managers

AIM is a world leader in captive management with over 1,230 clients and roots dating back to the beginning of the captive movement in the 1960s. The organization works in virtually every recognized domicile worldwide and employs over 500 experts from a variety of backgrounds. AIM takes pride in developing long-term relationships with clients, and passing on the benefits of cost-effective management using the latest technology and expertise. Today, the vast majority of captives are managed by specialized organizations, and Aon Insurance Managers manages more than anyone else.

IRMG

IRMG is a global leader in delivering independent advice and solutions for complex risk problems. With more than 25 years of proven experience, IRMG’s services enable clients to identify, assess, mitigate and finance complex risks. Consultants experienced in a range of disciplines ensure that clients reduce their risk exposure through creative solutions that are not only cost-effective, but incorporate creative use of capital and other resources such as access to reinsurance markets and specialized insurance vehicles.

Gecalux

Gecalux was founded in 1984 growing to become one of Europe’s leading independent companies in the field of risk financing.

This press release contains certain statements relating to future results, 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 the general economic conditions in different countries around the world, fluctuations in global equity and fixed income markets, exchange rates, rating agency actions, resolution of regulatory issues, including those related to compensation arrangements with underwriters, pension funding, ultimate paid claims may be different from actuarial estimates and actuarial estimates may change over time, changes in commercial property and casualty markets and commercial premium rates, the competitive environment, the actual costs of resolution of contingent liabilities and other loss contingencies, and the heightened level of potential errors and omissions liability arising from placements of complex policies and sophisticated reinsurance arrangements in an insurance market in which insurer reserves are under pressure.  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.

Aon Limited is authorised and regulated by the Financial Services Authority in respect of insurance mediation activities only.