Aon Capital Markets Places Industry’s First Transaction Utilizing WindX Parametric Index Solution

CHICAGO, Sept. 22 2008 — Aon Capital Markets today announced it has placed the industry’s first transaction utilizing the WindX™ parametric index solution. The transaction provides coverage from named storms based on wind speed data at several wind stations in Florida.

WindX is a proprietary parametric index solution designed to support the transfer and trading of catastrophic hurricane risk in the capital markets. This solution is based on location-specific wind speed measurements, either through direct reference to wind speed parameters or as a base input for derived indices. WindX supports a wide range of financial structures including over-the-counter derivative contracts, catastrophe bonds, and industry loss warranties.

“Aon Capital Markets has once again established itself as a leader in providing alternative risk solutions for our clients,” said Paul Schultz, president of Aon Capital Markets.

WindX is driven by the WeatherFlow Hurricane Mesonet, a network of hurricane-hardened weather stations specifically designed to measure and record hurricane-force winds. Stations in this new network are strategically sited to accurately capture hurricane events and support the transfer of hurricane risk. The wind speed data is valuable to others including emergency managers, modelers, insurers, and investors.

Market development for WindX is a joint effort between WeatherFlow Inc, a leading provider of proprietary weather data and Risk Management Solutions, a leading catastrophe risk management company.

About Aon Capital Markets

Aon Capital Markets is Aon Re Global’s boutique investment bank, providing clients with strategic advice and access to all forms of capital, and financial advisory services. Aon Capital Markets is one of the primary innovators of insurance-linked securities and recently completed the largest insurance-linked securitization in history. Since bringing the first ILS deal to the market in 1994, Aon Capital Markets has brought more than 50 deals to market.

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 2008, 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. In 2008, Aon ranked highest on the Business Insurance ranking of the world’s largest insurance brokers based on commercial retail, wholesale, reinsurance and personal lines brokerage revenues. Aon also was ranked by A.M. Best as the number one insurance broker based on brokerage revenues in 2007 and 2008, and was voted best insurance intermediary, best reinsurance intermediary, and best employee benefits consulting firm in 2007 and 2008 by the readers of Business Insurance.