Aon Corporation ("Aon") is pleased to announce that it has obtained antitrust, competition and regulatory approvals and consents so as to enable it to complete the recommended cash acquisition of Benfield Group Limited by Aon Benfield (Bermuda) Ltd, an indirect wholly owned subsidiary of Aon, to be effected by means of an amalgamation under the Bermuda Companies Act.

Aon expects that the Acquisition Effective Date will be Friday 28 November 2008.

Unless the context otherwise requires, terms defined in the circular sent to shareholders on 19 September 2008 but not defined herein have the same meaning when used in this announcement.

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