X0202 3 2007-07-20 0 0000315293 AON CORP AOC 0001407939 Besio Gregory J C/O AON CORPORATE LAW DEPT 200 EAST RANDOLPH STREET, 8TH FL CHICAGO IL 60601 0 1 0 0 SVP/Head of Global Stgy Common Stock 0 D Restricted Stock Unit Award (Right to Receive) 2012-05-17 Common Stock 18000 D Employee Stock Option (Right to Buy) 43.64 2013-05-17 Common Stock 17186 D Awards will vest in accordance with the Aon Stock Incentive Plan as follows: one-third of the awards will vest on each of the third through fifth anniversaries of the date of grant. The date of grant was May 17, 2007. The restricted stock unit award converts to shares of common stock on a 1-for-1 basis. Vesting will occur in accordance with the Aon Stock Incentive Plan as follows: one-third of the options will vest on each of the first through third anniversaries of the date of grant. The date of grant was May 17, 2007. /s/ Jennifer L. Kraft - by Jennifer L. Kraft pursuant to a power of attorney from Gregory J. Besio 2007-07-30