Bank One Corp. said on Wednesday that it is extending two major contracts -- a $1.4 billion, six-year deal for networking and data center outsourcing that it signed last year with AT&T and a $420 million, seven-year pact with International Business Machines Corp. -- to include operations of the former First Chicago NBD.

The contract expansion gives AT&T an additional $465 million to convert First Chicago's data and voice networking infrastructure. It gives IBM's global services division another $168 million to consolidate the former First Chicago's data center operations and help-desk support with Bank One's. The companies merged in October to form the nation's fifth-largest banking company.

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