LONDON, May 28, 2008 - Aon Re Global, the world’s largest reinsurance broker, was named best reinsurance intermediary in six categories in a London Market Leaders survey conducted recently by Global Broker & Underwriter magazine. Based on nearly 2,000 responses, Aon Re Global ranked highest in the brokerage of treaty, facultative, marine & energy, aviation, financial institutions and fine arts reinsurance brokerage.

Aon Re Global is a unit of Aon Corporation (NYSE: AOC). The results of the survey are published in the magazine's May/June 2008 issue, available at www.globalbrokermagazine.com.

"Our clients are increasingly telling us that the traditional 'off-the-shelf' solutions just don't meet their needs, so we are constantly challenging ourselves to deliver integrated capital solutions and services that are customized to each client," said Michael D. O'Halleran, founder and executive chairman of Aon Re Global, to Global Broker. "And every day we are searching for new ways to deliver value, better, faster and smarter than we did the day before. So we're thankful that readers of Global Broker have named Aon Re Global best, but we continue to challenge ourselves to do more."

Aon Re Global also has been recognized recently as market innovator of the year by readers of Reinsurance, and has been voted best reinsurance intermediary by readers of Business Insurance for each of the past two years.

About Aon Re Global
Aon Re Global provides clients with integrated capital solutions and services through a world-class network of experts in more than 35 countries. Clients are better able to differentiate and meet their business objectives with Aon Re Global's best-in-class treaty and facultative reinsurance placement services, capital markets expertise, and relevant analytics and technical expertise, including catastrophe management, actuarial and rating agency counsel. Aon Re Global was named best reinsurance broker in 2007 and 2006 by readers of Business Insurance.

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 named the world's "best broker" by Euromoney magazine's 2008 Insurance Survey. Aon also 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/.