Aon Integrates Worldwide Risk and Insurance Brokerage Operations Into One Global, Client-Focused Business

Reinforcing our commitment to exceptional client service and delivery; Strengthening leadership talent of the firm; Continued focus on performance and momentum for the benefit of shareholders

CHICAGO, 07 February 2008 � Reinforcing its commitment to client service excellence, Aon Corporation (NYSE: AOC) is integrating its worldwide risk and insurance brokerage operations into a single global business, Aon Risk Services, with more than 26,000 colleagues in 120 countries and more than $5 billion in revenues.

“Everything we do is based on helping clients, or helping colleagues help our clients,” said Greg Case, Aon Corporation president and chief executive officer. “This is a significant and logical next step in aligning our incredible resources and talent around our clients, and follows on the success of our other core global businesses � Aon Re Global and Aon Consulting. To the full credit of Aon colleagues around the world, our progress to date has enabled us to make this strategic move one year sooner than we anticipated.”

Aon Risk Services will be led by Steve McGill, currently chief executive officer of Aon Risk Services Americas and Aon Global, and Ted T. Devine, currently chief executive officer of Aon Re Global. McGill will serve as chairman and chief executive officer and Devine as president of Aon Risk Services, and both will continue to be based in Chicago.

McGill, whose career spans three decades, has led Aon Risk Services Americas and Aon Global since 2006. Through his leadership with clients, markets and Aon colleagues, he has helped to drive industry-leading growth that has positioned Aon as the world�s largest insurance brokerage and risk management firm. Devine, who joined Aon in 2005, has served as chief executive officer of Aon Re Global, head of strategy for Aon Corporation, chief operating officer of Aon Risk Services Americas and chief operating officer of Aon Global. Devine has driven operational excellence throughout the firm and led the implementation of Aon�s company-wide initiative driving revenue growth across all businesses.

“In bringing all our Aon Risk Services operations together, we are enhancing the ability of our colleagues around the world to bring their deep knowledge of local needs, innovation and expertise to one global, client-focused business,” said McGill. “This will reinforce our ability to ensure that innovative solutions are delivered globally, and we will see to it that no hurdle � real or perceived � stands in the way of bringing the very best of Aon to our clients.”

�For Aon Risk Services to truly operate on a global scale, Steve and I will create a global leadership team of senior Aon professionals from around the world,� Devine said. �We have great leaders in every region, and by bringing them together to lead Aon Risk Services, we will further improve our client leadership capabilities and will position our firm to deliver even more value and impact for our clients.�

About Aon

Aon Corporation (NYSE: AOC), ranked by A.M. Best as the number one global insurance brokerage based on brokerage revenues and voted best insurance intermediary, best reinsurance intermediary and best employee benefits consulting firm by the readers of Business Insurance, 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.