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ATLANTA--(BUSINESS WIRE)--Dec. 17, 2001

S1 Corporation (Nasdaq: SONE), a leading global provider of Enterprise eFinance solutions, today announced that S1 Corporate Banking is powering CIBC's newly launched Internet business banking service, CIBC Business Banking.

CIBC is the first Canadian bank to deliver a complete transactional business banking Website, which offers cash management services that provide sophisticated functionality and state-of-the-art security within an intuitive and user-friendly environment. S1 Corporate Banking enables CIBC to retain its business clients while offering enhanced services that simplify its clients' financial processes and makes their businesses more competitive.

"S1 has helped CIBC to realize its vision and be first-to-market in Canada with a robust transactional business banking Web solution," said Steve Webster, vice president of Business Deposits & Payments at CIBC. "By implementing CIBC Business Banking, CIBC was able to streamline its back-end systems, replace several legacy applications with one integrated solution and automate many back-office procedures that were formerly executed manually. CIBC is now able to offer its business customers one web-based service to satisfy all cash management needs."

CIBC Business Banking provides clients with point-and-click access to balance transaction reports, electronic payments and an automated process for file uploads and downloads. By offering corporate treasurers secure online access to financial records and transactions in real time, CIBC is empowering its business clients with state-of-the-art technology that enables them to keep finances current. Security controls, including user log-on, audit logs, payment authorization and administrative control of end-user access and functions, are a core component of CIBC Business Banking.

Built on an advanced and flexible system architecture, S1 Corporate Banking delivers a sophisticated, high-performance cash management offering that provides multilingual, multi-currency and multi-delivery channel capabilities on a global scale. S1 Corporate Banking delivers CIBC Business Banking customers the capability to report on multi-currency transactions in both French and English. Information reporting, global payments, file services and customer administration including quick customer setup are some of the key features CIBC will be using with the S1 Corporate Banking product.

"CIBC joins more than 500 financial service providers across the globe that rely on S1 for corporate banking solutions that deliver a significant competitive advantage," said Jeffrey W. Lunsford, president and general manager of S1 Corporation's Americas Region. "Partnering with S1 has given CIBC the definitive edge in serving corporate clients across Canada, and the launch of CIBC Business Banking proves that the Internet remains a growing channel for delivering financial services to businesses."

About CIBC

CIBC is a leading North American financial institution with more than eight million personal banking and business customers. CIBC offers a full range of products and services through its comprehensive electronic banking network, branches and offices across Canada, the United States and around the world. You can find other news releases and information about CIBC in their Media Centre on the Internet at www.cibc.com.

About S1 Corporation

S1 (Nasdaq: SONE) is a leading global provider to more than 2,600 banks, credit unions, insurance providers, and investment firms of enterprise software solutions that turn customer interactions into profits. S1's Enterprise eFinance solutions deliver a transactionable, customer-centric view across all delivery channels, resulting in a more compelling experience for the customers and a more profitable relationship for the financial institution. S1 is the only eFinance provider with the proven experience, breadth of products, and financial strength to empower financial services companies' Enterprise eFinance strategy. Additional information about S1 is available at www.s1.com.

Forward-Looking Statements

This press release contains forward-looking statements relating to results of operations; benefits of certain programs; product benefits; market penetration and market strategies. Such statements are made based on management's beliefs as well as assumptions made by, and information currently available to, management, pursuant to "safe-harbor" provisions of the Private Securities Litigation Reform Act of 1995. While these statements reflect our best judgment, they are subject to risks and uncertainties that could cause a change in focus and direction. A discussion of certain risk factors that may cause actual results to differ from these forward-looking statements can be found in S1's Annual Report on Form 10-K for the period ended December 31, 2000, on file with the SEC.