Wells Fargo & Co. and American Express Co. have revealed their choices for electronic bill presentment software, underscoring the importance financial institutions are attaching to billing retail customers over the Internet.

Wells, the seventh-largest banking company, chose the latest version of BillCast software from Just In Time Solutions Inc. of San Francisco to send electronic bills from its own, internal businesses. Just In Time announced Wells' decision Monday, several days after American Express said it had licensed software from edocs Inc. of Wayland, Mass. American Express also took a minority stake in edocs, for an undisclosed sum.

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