Aon to Webcast Annual Stockholders' Meeting.

Business Editors

CHICAGO--(BUSINESS WIRE)--April 17, 2002

Aon Corporation (NYSE: AOC) Chairman and CEO, Patrick G. Ryan, will host the Company's Annual Stockholders' Meeting on Friday, April 19, 2002 beginning at 10:00 a.m. (CDT). A live webcast of the meeting will be available via the Internet. This listen-only webcast can be accessed by going to the home page of Aon's web site at www.aon.com.

Aon Corporation (www.aon.com) is a holding company that is comprised of a family of insurance brokerage, consulting and insurance underwriting subsidiaries.

The annual stockholders' meeting presentation may contain 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 historical results or those anticipated, depending on a variety of factors such as general economic conditions in different countries around the world, fluctuations in global equity and fixed income markets, changes in commercial property and casualty premium rates, the competitive environment, the actual cost of resolution of contingent liabilities, the final form of the business transformation plan, the ultimate cost and timing of the implementation thereof, the actual cost savings and other benefits resulting therefrom, whether the Company ultimately implements the proposed spin-off of its underwriting operations, and the timing and terms associated therewith, and events surrounding terrorists attacks of September 11, 2001, including the timing and resolution of related insurance and reinsurance issues. Further information concerning the Company and its business, including factors that potentially could materially affect the Company's financial results, are contained in the Company's filings with the Securities and Exchange Commission.