TCF Bank Raises the Bar for Retail Banking with S1 Enterprise Solutions; Realizes Immediate Increase in Online Adoption and Bottom-Line Savings

Business Wire, June 10, 2003

Business Editors

ATLANTA--(BUSINESS WIRE)--June 10, 2003

S1 Corporation (Nasdaq: SONE), a leading global provider of Enterprise solutions for the financial services industry, today announced that TCF Bank has successfully deployed S1 Personal Banking and the S1 Customer Center to deliver more personalized, feature-rich services to its customers over the Internet. A wholly owned subsidiary of TCF Financial Corporation (NYSE:TCB), TCF Bank is utilizing the S1 Enterprise applications to further retain and expand its customer base, while significantly lowering lifecycle costs. The solutions are being hosted at S1's state-of-the-art data center in Atlanta, Ga.

In May, more than 45,000 customers were converted from a previous S1 product to S1 Personal Banking on the S1 Enterprise Platform, a J2EE-based, open architecture technology platform. By the end of July, TCF will complete the transition for the remaining 260,000 online customer accounts.

"Since we've been live with S1 Personal Banking, we have been able to offer customers competitive new features, and grow our online customer base," said Tim Doyle, senior vice president and director of online banking at TCF. "At the same time, we are significantly reducing online banking application lifecycle costs, including implementation, integration and ongoing support."

"TCF is firmly committed to being the most convenient bank in the markets we serve," adds Doyle. "This immediate success reaffirms our confidence in S1 as a valued extension of our team - one that is equipping us with the vast online banking expertise, state-of-the-art hosting capabilities and best-of-breed applications we need to deliver on our promises to our customers."

S1 Personal Banking is providing TCF customers with an easy-to-use interface that offers the full spectrum of personal finance management capabilities and brings deposit and loan accounts into one consolidated view. In addition to core features - online enrollment, 24-hour access to account activity, funds transfer and bill payment - TCF is now offering account balance alerts, account reminders and automatic transfer of funds services. TCF also has the flexibility to cost-effectively customize the application with the S1 Application Manager, an enriched bank administration tool that is an integrated component of the S1 Enterprise Platform.

Through S1 Customer Center, a database-driven portal technology, the bank has also created a branded Website from which its customers can perform a wide-range of functions, such as, tracking stocks, searching the Web and accessing everything from weather reports to breaking news.

"We are extremely pleased to help TCF further its leadership position as the bank that offers the utmost in customer convenience and personalized service. The implementation of the Enterprise applications is proof of the bank's dedication to providing the best service across all of its channels," said Jaime Ellertson, chief executive officer of S1 Corporation. "The expansion of our strong relationship with TCF is validation that we're offering the solutions financial institutions need to succeed in today's environment."

TCF joins the more than 80 financial services providers worldwide that have chosen the S1 Enterprise solutions to increase revenue opportunities, drive down operational costs and ultimately gain one view of their customers across channels.

About TCF

TCF (NYSE: TCB) is a Wayzata, Minnesota-based national financial holding company with $12 billion in assets. TCF has more than 390 banking offices in Minnesota, Illinois, Michigan, Wisconsin, Colorado and Indiana. Other TCF affiliates provide leasing and equipment finance, mortgage banking, discount brokerage, and investments and insurance sales.

About S1 Corporation

S1 (Nasdaq: SONE) is a leading global provider to approximately 4,000 banks, credit unions, insurance providers, and investment firms of enterprise software solutions that create one view of customers across multiple channels, applications and segments. S1's Enterprise software solutions uniquely combine customer interaction and financial transaction capabilities, resulting in a more compelling experience for the customers and a more profitable relationship for the financial institution. S1 is the only provider with the proven experience, breadth of products, and financial strength to empower financial services companies' enterprise strategies. Additional information about S1 is available at www.s1.com.

Forward-Looking Statements

This press release contains forward-looking statements within the safe harbor provisions of the Private Securities Litigation Reform Act. These statements include statements with respect to our financial condition, results of operations and business. The words "believes," "expects," "may," "will," "should," "projects," "contemplates," "anticipates," "forecasts," "intends" or similar terminology identify forward-looking statements. These statements are based on our beliefs as well as assumptions made using information currently available to us. Because these statements reflect our current views concerning future events, they involve risks, uncertainties and assumptions. Therefore, actual results may differ significantly from the results discussed in the forward-looking statements. The risk factors included in our reports filed with the Securities and Exchange Commission (and available on our web site at www.s1.com or the SEC's web site at www.sec.gov) provide examples of risks, uncertainties and events that may cause our actual results to differ materially from the expectations we describe in our forward-looking statements. Except as provided by law, we undertake no obligation to update any forward-looking statement.