ADVISORY/S1 To Feature Enterprise Platform and Business Banking Solutions at AFP Conference.

Business Editors/High-Tech Writers

ADVISORY...for Nov. 3-Nov. 5 (Sunday-Tuesday)

--(BUSINESS WIRE)

Who:    S1 Corporation (Nasdaq: SONE), the leading global provider of
        Enterprise software solutions

What:   Company to highlight S1 Business Solutions, including S1
        Corporate Banking, S1 Business Banking and S1 Trade Finance

Where:  Booth 1512
        23rd Annual AFP Conference
        New Orleans, Louisiana

When:   Sunday, November 3 through Tuesday, November 5, 2002

S1 delivers best-of-breed commercial banking solutions utilized by the world's largest financial services providers, including Bank of America, FleetBoston Financial, Comerica and U.S. Bancorp. S1 will showcase the latest business solutions including applications addressing the cash management, trade finance, customer relationship management and payment needs of small and mid-sized businesses to large corporations. S1 business solutions empower financial services providers to establish more meaningful and profitable relationships with their customers. S1 offers its applications on-premise or hosted in its data centers in the U.S., U.K., or Asia.

At the AFP Conference, S1 will discuss the momentum of recent customer wins and implementations, the movement of banks to the S1 Enterprise solutions, an open J2EE architecture that enables providers to radily integrate their multiple delivery channels and maximize existing technology investments as well as the measurable business benefits of the following products:

-- S1 Corporate Banking: S1 Corporate Banking is a high-performance cash management offering that provides multi-lingual, multi-currency and multi-delivery channel capabilities on a global scale. Like other S1 solutions, this product could be deployed through a data center or on-premise for banks that are looking to acquire global market share while reducing the total cost of ownership. Information reporting, global payments, check services, and customer administration including quick customer setup are some of the key features providers can leverage utilizing the S1 Corporate Banking product. S1 Corporate Banking has been proven in the most rigorous environments by banks around the globe.

-- S1 Business Banking: S1 Business Banking allows financial services providers to deliver simplified business functionality to the smallest proprietor up to its largest mid-market client. The application simplifies cash management, domestic and international payment and transfer capabilities for easy organization and administration of company funds, while delivering sophisticated security that protects investments.

-- S1 Trade Finance: S1 Trade Finance delivers the ability to engage in trading activities around the globe, while effectively managing associated risks. Corporate clients can originate and make amendments to import letters of credit, standbys and guarantees, purchase orders and documentary collections. The application can receive any document, including export letter of advices, sent from the bank. The product also reduces costs and enables improved efficiency and accuracy for both the bank and the client.

-- Purchase Order Processing System: S1's new Purchase Order Processing system offers an automated solution for processing purchase orders, Open Account transactions, and handling discrepancies/variances. The solution provides automatic compliance checking by doing a comparison of shipment data entered by the bank staff with Letter of Credit or Open Account data supplied by the customer. Purchase Order uploading in standard industry formats, as well as EDI import, for high-volume customers is fully accommodated.

For more information regarding S1's Business Solutions, please visit www.s1.com. For media inquiries or to set up briefings at the show, please contact Brian Gendron at 617-393-4244 or [e-mail].

About S1 Corporation

S1 (Nasdaq: SONE) is a leading global provider to more than 3,900 banks, insurance providers, and investment firms of enterprise software solutions that create one view of customers across multiple channels, applications and segments. S1's Enterprise 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.

Forward-Looking Statements

This press release contains forward-looking statements relating to results of operations; product features and 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, 2001, on file with the SEC.