Postilion deploys its payment processing software in a fifteenth African country

London, UK, 25 Apr 2008

Postilion, a leading provider of software solutions for self-service banking and payments and a division of S1 Corporation (Nasdaq: SONE), today announced that it has established a footprint in a fifteenth African country.

Operating in the African market since 1994, the organisation already has a presence in South Africa, Namibia, Zimbabwe, Zambia, Malawi, Tanzania, Kenya, Nigeria, Ghana, Sierra Leone, Mauritius, Seychelles, Swaziland, the Gambia, and has now deployed a solution with Bankom, Uganda's largest transaction switch.

Africa is the continent on which Postilion was launched and it remains one of the company's key global markets. Africa's three top banks and three top retailers use Postilion to drive their electronic payments. More than 100 million transactions are processed per month in South Africa alone. Postilion has also been selected for use as the largest bank transaction switch in Nigeria, Zimbabwe, Tanzania, and Kenya.

Postilion's core global research and development is undertaken in Cape Town, affirming the company's faith in the quality of the skills on offer in Africa. The Cape Town office also offers product support to clients internationally. An expanding Johannesburg office focuses on sales and professional services to African clients.

In the drive to expand the Postilion footprint throughout the African continent, the organisation has developed close long-term strategic partnerships with EFTCorp and TPS (both based in Harare, Zimbabwe) and with InterSwitch (based in Lagos, Nigeria). This has resulted in almost 70 new clients from across the African continent being added to Postilion's growing international client base.

Postilion solutions are well suited to African market conditions and the following features have all contributed to the success of Postilion deployments in Africa: modular solution architecture; flexible and scalable open systems platform; robust ATM and POS driving capabilities; strong management information and reporting functionality; and quick implementation time scales.

"Over the past 14 years, together with our strategic partners, we at Postilion have contributed to the development of banking and payment services for the people of Africa. This has made a real difference to the way individuals manage their finances and conduct their day-to-day lives," commented Deon van Biljon, Senior Vice-President and General Manager, Postilion Africa.

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.

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, www.S1enterprise.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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Postilion deploys its payment processing software in a fifteenth African country

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