Postilion showcases new customer administration portal at Africa's premier banking technologies conference

Johannesburg, SA and Nairobi, Kenya, 17 Feb 2009

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 will participate at the annual AITEC event, in Nairobi, from 17 to 19 February.

This year's event will focus on the customer's experience of technology implementation and services, challenging suppliers and bankers alike to evaluate their systems in light of customer needs and preferences.

The latest enhancements to Postilion's market leading payments solutions, a new customer administration portal, will be on show at stand E1. Payments experts will be on hand to demonstrate the Postilion Portal, which gives a unified view of customers, accounts, transactions, and activity across various payments channels via a Web browser.

Four speakers will showcase Postilion's customer-centric payments solutions at the conference:

* Case study: The Umoja Switch in Tanzania, by Paul Nilsen, GM of Business Connexion, a Postilion client based in Tanzania (Session 3).

* Innovating for EFT success, by Andr'e Niemand, Sales Manager, Postilion Africa (Session 3).

* Point of sale value-added services, by Ophias Sherewa, MD of Transaction Payment Systems, a Postilion reseller in Africa (Session 6).

* Facilitating prepaid with electronic voucher distribution, Jim Baird, MD of ATM Africa, a Postilion reseller in Africa (Session 7).

More than 90 organisations in Africa now use Postilion to enhance their customers' experience of electronic payments. Internationally, more than 300 clients have successfully implemented various Postilion solutions. Postilion drives major transaction switches and processors in numerous African countries, including the continent's largest economies: South Africa, Nigeria, and Kenya. Smaller regional switches, such as those in Tanzania, Zambia, Zimbabwe and Uganda, also run on Postilion platforms. Africa's top three banks and top three retailers use Postilion to drive their electronic payments. Postilion has a presence in 15 countries across the African continent.

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 harbour 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 showcases new customer administration portal at Africa's premier banking technologies conference

Postilion co-sponsors East Africa 2009 Banking & Payment Technologies Conference.