Underscoring their focus on client service and providing innovative, customized solutions, nine members of the Aon Re Global team were recognized as "Reinsurance Power Brokers" by Risk & Insurance in the magazine's April 1 issue.

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

The reinsurance power brokers were recognized for their service and advocacy on behalf of their clients. The magazine selected individuals based largely on feedback from insurers and reinsurers.

"Each and every day, our focus is on providing the best for our clients and markets," said Michael D. O'Halleran, chairman and CEO of Aon Re Global. "The expertise of our people, across a broad range of categories, is the reason we are able to deliver long term value to our clients in their terms. We congratulate our winners and thank our clients and reinsurers for this wonderful recognition."

Aon Re Global's Marine team was described as "in a class by itself" and its Casualty and Retro teams were cited as being important players. Individuals recognized from Aon Re Global, the world's leading provider of reinsurance brokerage and integrated capital solutions and services, were:

   Property
   -- Scott Clark, executive vice president, managing director and head of
      the property practice
   -- Kelly Smith, executive vice president

   Casualty
   -- Michael Amatrudo, senior vice president

   Retrocession
   -- John Demeusy, senior vice president and managing director
   -- Steve Binet, executive vice president

   Facultative
   -- Bill Kasbeer, chairman and chief executive officer-Aon Specialty Re

   Marine
   -- Graeme Moore, chief executive officer-marine and energy practice

   Professional Liability
   -- Wayne de Nazarie, executive vice president
   -- Dan Dolan, executive vice president and head of the directors and
      officers practice

This is the first time Risk and Insurance magazine has recognized Power Brokers in reinsurance. Because of the increasingly analytical nature of the business, applying reinsurers typically mentioned a team of brokers from a particular firm. So, in contrast to the commercial insurance Power Broker listings, the reinsurance Power Brokers also highlighted the strengths of the brokerage firms in those categories. Risk and Insurance interviewed 37 reinsurance companies and 18 of the largest cedents over a 3 month period to determine the 2007 result.

The publication evaluated six areas: property reinsurance, casualty reinsurance, professional liability reinsurance, retrocession reinsurance, facultative reinsurance and marine reinsurance. Risk and Insurance interviewed both cedents and reinsurers and asked them to identify individual brokers who they thought were the best.

"Each and every day, our focus is on providing the best for our clients and markets," said Michael D. O'Halleran, chairman and CEO of Aon Re Global. "The expertise of our people, across a broad range of categories, is the reason we are able to deliver long term value to our clients, in their terms. We congratulate our winners and thank our clients and reinsurers for this wonderful recognition."

About Aon

Aon Corporation (NYSE: AOC)( 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 43,000 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 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, ERISA class actions, the impact of the analysis of practices relating to stock options, 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.

  Media Contacts

  Chicago:                           London:
  Al Orendorff                       Reuben Aitchison
  312.381.3153                       +44 (0)20 7086 7201
  Al_Orendorff@aon.com               Reuben.Aitchison@aon.co.uk

First Call Analyst:
FCMN Contact: Al_Orendorff@asc.aon.com

Photo: http://www.newscom.com/cgi-bin/prnh/20041215/CGW049LOGO
AP Archive: http://photoarchive.ap.org/
PRN Photo Desk, photodesk@prnewswire.com

SOURCE: Aon Corporation

CONTACT: Chicago, Al Orendorff, +1-312-381-3153, Al_Orendorff@aon.com ,
or London, Reuben Aitchison, +44 (0)20 7086 7201, Reuben.Aitchison@aon.co.uk ,
both for Aon Corporation

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