Medienmitteilung-- July 22, 2004

Aon and CSC Sign $600 Million IT Outsourcing Agreement

Computer Sciences Corporation (NYSE: CSC) announced today that it has signed a seven-year contract worth approximately $600 million to provide Aon Corporation's (NYSE: AOC) U.S. operations with information technology (IT) infrastructure support services.

Under the agreement, CSC will operate and manage Aon's U.S. telecommunications and data networks, desktop support, related help desk services and various IT support functions. Aon will retain responsibility for IT strategy and leadership, architecture and application development, and
maintenance.

"CSC is pleased to enter into this definitive agreement with Aon," said CSC Chairman and Chief Executive Officer Van B. Honeycutt. "CSC's experience in managing enterprise IT infrastructures and our understanding of the risk management industry make us well suited to this role. We look forward to helping Aon achieve its business goals."

Approximately 600 Aon IT employees and contractors currently manage the company's technical infrastructure. Under the agreement, the majority are expected to transition to CSC in late August.