ADVISORY/S1 to Present Delivery Channel Optimization at the International Conference for E-Business and the Global Marketplace.

Business Editors

ADVISORY...for Sunday - Tuesday (May 11 - May 13)

--(BUSINESS WIRE)

    Who:    S1 Corporation, a leading global provider of Enterprise
            software solutions

    What:   Delivery Channel Optimization, presented by Huib J.A.M.
            Gerrits, Commercial Director, S1 EMEA

    Where:  International Conference for E-Business and the Global
            Marketplace
            University of Mons Hainaut, Belgium

    When:   Sunday 11 May through Tuesday 13 May 2003

S1 Corporation, the main sponsor for the International Conference for E-Business and the Global Marketplace, will present the company's Delivery Channel Optimization (DCO) concept. DCO is based on the principles of combining true revenue-generating benefits of financial services like CRM with the cost-saving benefits of implementing a truly integrated multi-channel, multi-application banking system. By deploying a DCO strategy, financial institutions increase their knowledge of their customers and the way they interact with channels in order to optimize every interaction, no matter which channel or service they are using.

Gerrits will discuss channel integration trends and market opportunities across Europe. He will review why branch integration is the driving force behind this trend and the movement of financial service providers to open J2EE architectures. In addition, Gerrits will present how financial institutions can integrate multiple channels of consumer interaction to gain one view of customers' financial portfolios, as well as how to optimize the role of the teller to generate new revenue opportunities.

S1's Enterprise Solutions closely adhere to the highest J2EE standards that enable banks to rapidly integrate their multiple delivery channels, maximize existing technology investments and gain measurable business benefits.

For more information regarding S1's Enterprise Solutions, please visit www.s1.com. For media inquiries or to set up briefings at the show, please contact Sela Missirian, S1 Director of International Marketing at [phone].

About S1 Corporation

S1 (Nasdaq: SONE) is a leading global provider to approximately 4,000 banks, building societies, 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. S1 offers its applications on-premise or hosted in its data center.

S1 customers range from small building societies to top 10 global financial services organizations. This list of premiere institutions includes companies such as ABN AMRO, AGF, Alliance & Leicester, Allianz Group, ANZ, Bank of America, BHW Bausparkasse, BUPA, Comerica, Dah Sing Bank, FleetBoston, GE Financial Assurance, Maybank, MBNA, NCR, Overseas Chinese Banking Corporation, Principal Bank, Regions Financial Corporation, Swiss RE, Synovus and Yapi Credi Bank. 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.