CHICAGO, April 14 /PRNewswire-FirstCall/ -- Aon Corporation (NYSE: AOC), the world's leading risk advisor and insurance broker, has been named the world's best insurance broker by the respondents of Euromoney magazine's first-ever insurance survey.

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

Aon also was named "best broker" in Western Europe, Asia and Latin America, with specific recognition in 12 countries, including China and India.

Euromoney polled over 250 risk managers, treasurers and chief financial officers at the top companies in 31 countries. Respondents were asked to rank the best insurers, brokers and also the best companies working in alternative market mechanisms. The poll was conducted from October 29-December 21, 2007, and the results were released the week of April 7th.

"Aon is honored to be recognized as the world's best insurance broker by the respondents to the Euromoney survey," said Greg Case, Aon president and chief executive officer. "Misunderstanding risk is now more than ever a potentially fatal mistake for businesses, and Aon's ability to offer our clients distinctive value, unmatched talent and operational excellence has allowed us to establish our position as a leading client service firm."

Euromoney magazine was created in 1969 to cover the re-emergence of the international cross-border capital markets. The euromarket, after which the magazine is named, grew exponentially as national capital restrictions were liberalized throughout the 1970s and 1980s, creating today's mainstream global capital markets. Euromoney reported on, and championed, this market and its growth, in the process becoming the prime magazine of the wholesale financial world, its institutions and its users.

About Aon

Aon Corporation (NYSE: AOC) is the leading global provider of risk management services, insurance and reinsurance brokerage, human capital and management consulting. Through its 36,000 colleagues worldwide, Aon readily delivers distinctive client value via innovative and effective risk management and workforce productivity solutions. Our industry-leading global resources, technical expertise and industry knowledge are delivered locally through more than 500 offices in more than 120 countries. Aon was ranked by A.M. Best as the number one global insurance brokerage in 2007 based on brokerage revenues, and voted best insurance intermediary, best reinsurance intermediary, and best employee benefits consulting firm in 2007 by the readers of Business Insurance. For more information on Aon, log onto http://www.aon.com/

   For more information, contact:
   David Prosperi
   312-381-2485
   David_prosperi@aon.com

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SOURCE: Aon Corporation

CONTACT: David Prosperi of Aon Corporation, +1-312-381-2485,
David_prosperi@aon.com

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