Within six weeks of Integrion's announcement that it was turning over its Internet banking system from the service bureau to banks to run in-house, two of the utility's six clients have disclosed plans to switch to a new system.

One of them, Bank One Corp., was Integrion's first and largest customer, accounting late last year for half its end users. The Chicago bank has agreed to move by year's end to the Voyager system from Corillian Corp., lately the leading light in Internet banking. Bank One will use Beaverton, OR-based Corillian for www.bankone.com, its original Web site, but not for its WingspanBank.com subsidiary.

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