Aon to Webcast Stockholder Meeting Today

Aon Corporation Executive Chairman, Patrick G. Ryan, will host the company’s annual stockholders’ meeting today Friday, May 19, 2006 at 10:00 a.m. Central Time.

A Webcast of the presentation and questions by stockholders attending the meeting in Chicago will be available via the Internet.

The listen-only Webcast can be accessed by going to the home page of Aon’s web site at http://www.aon.com. The Webcast will be archived for two weeks.