S1 Enterprise Customer Conference 2008, Miami, FL and Norcross, GA - S1 Corporation (Nasdaq: SONE), a leading global provider of customer interaction software solutions for financial and payment services, and Clickatell, a leading global mobile messaging provider, today announced a partnership to provide on-demand text-based mobile services through the S1 Enterprise and Postilion Internet Banking solutions.

S1 Enterprise and Postilion customers across the globe will be able to take advantage of the on-demand capabilities of SMS banking and payments services, including account balance inquiries, funds transfers, account alerts and person-to-person (P2P) payments. The two-way SMS service enables users to proactively manage their finances and monitor potential fraud via their mobile phones.

Clickatell's global messaging gateway delivers transactions and alerts to and from cell phones over 700 networks in more than 200 countries. "Clickatell complements our comprehensive mobile offering which includes SMS and mobile Internet banking and payments services," said Mike Jackson, S1's Vice President of Product Strategy. "As we looked to make a decision among mobile gateway providers, Clickatell was the right fit given the company's global reach, enterprise expertise, and ability to provide the quality of service needed for our banking and payments customers worldwide." Red Gillen, banking analyst for Celent, a leading analyst firm commented, "Given the familiarity with SMS, high cell phone penetration, and ease of implementation, text messaging is a primary driver for mobile banking. Basic SMS alerts are unique in that they are the mobile technology that can reach out and find banking customers to manage account balances, move money between accounts, detect fraud in real-time, and much more.

As banks continue to roll out their mobile strategies, SMS should be a priority, given its relatively fast implementation timeline and usefulness to consumers." "S1 Enterprise, Postilion and Clickatell have extensive experience in providing services to the financial community - it makes perfect sense that we would team up to provide financial institutions with on demand access to text banking," said Pieter de Villiers, CEO of Clickatell. "As banks continue to reach out to an increasingly mobile customer base, they require the ability to communicate interactively with their customers in a secure, real-time manner. We look forward to working with S1 Enterprise and Postilion to help deliver on-demand text-based mobile services to their sizable customer base." About S1 Enterprise More than 100 banks and three million consumer, small business, and corporate users worldwide rely on S1 Enterprise solutions to access and manage their financial information.

A division of S1 Corporation (Nasdaq: SONE), S1 Enterprise is a leading provider of integrated banking solutions that deliver financial service providers a holistic view of their customers whether online, in the branch or in the call center.  About Postilion Postilion, a division of S1 Corporation (Nasdaq: SONE), is a leading provider of integrated solutions for self-service banking and payment processing. Our offices, on five continents, serve over 1,500 customers in more than 50 countries. Postilion solutions drive self-service financial transactions and payments, including advanced transactions such as prepay, through Internet access points, ATMs, POS terminals, and phones.

More than 100,000 ATMs and 500,000 POS terminals worldwide run on Postilion solutions. In the United States, over 1,250 credit unions and community financial institutions use Postilion solutions. Built on open systems, Postilion solutions provide consolidated management information, card management, 3DES and EMV enablement, and loyalty management. At the forefront of compliance with new regulations and security enhancements, such as the Payment Card Industry Data Security Standard (PCI DSS) and Visa's Payment Application Best Practices (PABP), Postilion can help customers achieve compliance with the latest data security standards developed by the payment card industry. More information is available at www.postilion.com.

About S1 Corporation S1 Corporation (Nasdaq: SONE) delivers customer interaction software for financial and payment services and offers unique solution sets for financial institutions, retailers, and processors under three brand names: Postilion, S1 Enterprise and FSB Solutions. Additional information about S1 solutions is available at www.s1.com, www.postilion.com,  and www.fsb-solutions.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.

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