Aon Worksite Solutions Wins Third Consecutive Quality Award for Professional Employer Outsourcing Capabilities.

Business Editors

CHICAGO--(BUSINESS WIRE)--Nov. 19, 2001

Aon announced today that the ProEmp Journal, the premier publication for the professional employer outsourcing industry, has selected Aon Worksite Solutions for the third consecutive year as one of the distinguished recipients of its Vendor Excellence Awards, or "Vendies." According to the November 2001 issue, the winners have displayed a "dedicated attitude, culture and loyalty to the professional employer outsourcing industry."

"Our client-focused approach has helped us deliver the right products and services for our markets," commented John Gilmore, National Managing Director, Aon Worksite Solutions PEO Division. "We've gained a lot of ground since our inception five years ago. We attribute our growth to the ease of implementation for employers and to a strong reception by client companies and their employees. We are becoming the voluntary benefits provider of choice."

"We're proud of the fact that for the third consecutive year we've won this quality award," said Ron Agpyt, Senior Vice President & National Sales Manager for Aon Worksite Solutions. "We will continue to focus on helping our clients by anticipating their needs and building the first ever nationally controlled distribution, service and enrollment company in North America."

Aon's acceptance of this award confirms a commitment to quality service and product development. "The net advantage of Worksite Solutions' services to professional employer outsourcing is that they help increase employee morale, lower employee turnover, improve participation in core benefits, and positively affect a client's bottom line," remarks an article in the November 2001 issue of the ProEmp Journal, "Worksite Solutions is dedicated to product development and is always bringing new products and services on stream to enhance an employee's comfort and convenience."

Aon's persistent, focused efforts to build strategic partnerships in the PEO marketplace is yielding further industry notice. The Journal continues, "The Company's many strategic alliances and partnerships are spreading awareness of its value-added services throughout the outsourcing industry," and "among Worksite Solutions' 203 clients, 78 are professional employer organizations (PEOs) and administrative service organizations (ASOs)."

Aon Corporation (www.aon.com) is a holding company that is comprised of a family of insurance brokerage, consulting and insurance underwriting subsidiaries. Aon's common stock is listed on the New York, Chicago, Frankfurt and London stock exchanges.

This press release 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. 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.