Aon Re Global, the world's leading provider of reinsurance brokerage and integrated capital solutions and services, was named best reinsurance broker by readers of Reinsurance magazine.

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

The company also was recognized for best use of the Internet, and Michael Bungert, president and chief executive officer of Aon Re Americas, was named individual broker of the year. The awards are published in the magazine's December/January edition.

"By being innovative, proactive and responsive, my colleagues continue to deliver impactful results and distinctive value for our clients," said Michael D. O'Halleran, chairman and chief executive officer of Aon Re Global. "The endorsement from the readers of Reinsurance is both a source of pride and a challenge to us to continue to listen harder, work smarter and deliver more to our clients."

The magazine said readers, in selecting Aon Re as best reinsurance broker, "praised Aon's customer service, innovation, technology and global reach." Readers also praised Aon Re's Web site and Internet-based client service capabilities. The magazine said Bungert "faced fierce competition" among other individual broker of the year nominees, but won the award "because of his personality and leadership skills."

"It is great to see the Aon Re team honored after so many years of hard work as advocates for our clients," said Michael Bungert, president and chief executive officer of Aon Re Americas. "We will continue to invest in the resources that help our clients differentiate themselves and grow their business."

In August, readers of Business Insurance named Aon Re best reinsurance intermediary. In October, Aon Re executive vice president Kelly Smith was ranked by Business Insurance as a Woman to Watch. Additionally, Aon Re outperformed its peers in a London's Best Brokers survey conducted by Reactions.

About Aon

Aon Corporation (NYSE: AOC) is a leading provider of risk management services, insurance and reinsurance brokerage, human capital and management consulting, and specialty insurance underwriting. Aon has 45,000 employees in 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 obtain regulatory or legislative changes to permit continuous sales of our supplemental Medicare health product, 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.

  For more information contact:
  Rahsaan Johnson
  312.381.2684
  Rahsaan_Johnson@aon.com

First Call Analyst:
FCMN Contact: rahsaan.johnson@aon.com

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SOURCE: Aon Corporation

CONTACT: Rahsaan Johnson of Aon Corporation, +1-312-381-2684, or
Rahsaan_Johnson@aon.com

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