Aon Consulting Acquires London-based Market Intelligence Firm Z/Yen Limited

Chicago - March 13 2007

Aon Consulting, the human capital consulting organization of Aon Corporation (NYSE: AOC), announced today that its subsidiary, McLagan Partners, has completed the acquisition of Z/Yen Limited, a London-based market intelligence firm. Z/Yen Limited is a subsidiary of the Z/Yen Group, and all other work undertaken by the Z/Yen Group such as management consultancy, research and predictive software, are unaffected by this change. The terms of the transaction are not disclosed.

McLagan Partners, a leading pay and performance organization, offers proprietary market studies and consulting services to firms in the financial services industry. The acquisition of Z/Yen Limited will complement McLagan’s existing services by providing cost per trade analysis and customer perception studies for the capital markets.

“The acquisition of Z/Yen Limited will provide tremendous value to our clients through significant enhancement of our services,” said Andrew Appel, chief executive officer of Aon Consulting Worldwide. “We are looking forward to expanding our global business opportunities in the financial services market with the addition of these capabilities.”

“Since 1999, Z/Yen Limited has measured cost per trade and operational efficiency across the capital markets industry and worked with over 30 major banks,” said Jeremy Smith, head of Z/Yen Limited. “We believe that integration with McLagan Partners will enable us to extend our reach globally and provide a more comprehensive analytical service to our clients.”

“The sale of Z/Yen Limited makes strategic and operational sense for all parties, and we are jointly delighted with this outcome,” said Michael Mainelli, executive chairman of the Z/Yen Group.

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