Aon Corporation (NYSE: AOC) today announced the formation of Aon Affinity Worldwide, a new business unit dedicated to serving people and businesses that have common interests and needs for specialized insurance protection.

(Logo: http://www.newscom.com/cgi-bin/prnh/20041215/CGW049LOGO )

Aon has been providing clients in the U.S., Europe, Latin America and Asia with industry-leading affinity solutions for more than 20 years. In establishing Aon Affinity Worldwide, the company formalizes its internal structure, and enhances its global reach and client service. The Aon Affinity Global Practice Group will be incorporated into this new unit.

Said Greg Case, president and chief executive officer of Aon Corporation: "Aon is widely regarded as best in class in the affinity market. Establishing a worldwide effort to build upon our affinity capability will further strengthen our ability to serve clients distinctively."

Said Kevin Garvin, chief executive officer of Aon Affinity Worldwide: "We will become more efficient through economies of scale and skill, as we drive client value locally, while leveraging our infrastructure and best practices globally. At the same time, by developing Aon Affinity Worldwide, we are expanding the career paths of our more than 3,000 worldwide affinity practitioners."

  For more information, contact:
  Al Orendorff, Aon Corporation, 1.312.381.3153, Al.Orendorff@aon.com

  About Aon

Aon Corporation ( http://www.aon.com/ ) is a leading provider of risk management services, insurance and reinsurance brokerage, human capital and management consulting, and specialty insurance underwriting. There are 47,000 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, our ability to consummate the pending sale of the Aon Warranty Group, 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.

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SOURCE: Aon Corporation

CONTACT: Al Orendorff of Aon Corporation, +1-312-381-3153,
Al.Orendorff@aon.com

Web site: http://www.aon.com/