RAKBANK Chooses Postilion for Payments Channel Innovation

DUBAI, United Arab Emirates and LONDON, May 11 /PRNewswire-FirstCall/ --
Postilion, a leading global provider of payments software solutions and a
division of S1 Corporation (Nasdaq: SONE), today announced that RAKBANK, the
National Bank of Ras Al-Khaimah in the United Arab Emirates, has selected
Postilion solutions to drive the bank's ATM network. For RAKBANK, the
implementation of Postilion for ATM Owners and Deployers will bring
operational improvements and help the bank deploy new ATM services faster and
more efficiently.

RAKBANK chose Postilion to improve the bank's competitive differentiation in
the UAE. The Postilion solution for ATM owners and deployers will replace the
bank's existing ATM solution, providing real-time monitoring and a holistic
view of all payment transactions on the ATM channel. Postilion's proven
reliability and flexibility will allow RAKBANK to enhance system availability
and will facilitate the introduction of additional banking services more
quickly to satisfy new business demands.

Postilion's PA-DSS validated payments platform is regularly updated to address
the latest data security standards. By choosing Postilion to be at the centre
of its ATM network, RAKBANK will be able to more easily maintain compliance
with payment card industry security regulations. Postilion's back-office
application will provide automated reconciliation with the UAE's national EFT
switch and provide consolidated reports on payments processing activity and
performance to support RAKBANK's IT management decision-making.

"More and more banks and processors in the Middle East are relying on
Postilion as we provide regional specialization and support coupled with
international expertise and world-class payments software," said Francois van
Schoor, President of Postilion Payments. "We look forward to supporting
RAKBANK in their drive for exceptional customer service and operational
excellence."

About RAKBANK

RAKBANK, the National Bank of Ras Al-Khaimah, is a leading retail bank in the
UAE, serving 330,000 customers. Founded in 1976, the bank is one of the UAE's
oldest local financial institutions and today one of its fastest growing and
most dynamic banks, with assets worth Dh14.5billion.

The bank offers a wide range of personal banking services through its 26
branches and telephone and online banking channels. It is a leading provider
of credit cards and was first to introduce the concept of 'Free for Life'
cards, a facility now adopted by many industry players. It is also a
significant player in the mortgage finance and small to medium enterprise
business sectors.

Customer service excellence is a cornerstone of the bank's success, with the
bank having been voted in 2008 for four years running as #1 Bank in Customer
Service in the UAE Annual Bank Benchmarking Study.

For more information, visit www.rakbank.ae or please contact:

Basma Alwesh, Dir Tel: 04 2915064, mobile: 050 6500743, email:
basma@rakbank.ae
Lamis Daoud, Dir Tel: 04 2915055, mobile: 050 5973247, email:
lamis.daoud@rakbank.ae

About Postilion

Postilion, a division of S1 Corporation (NASDAQ: SONE), is a leading global
provider of payments software solutions used by over 300 banks, card issuers,
merchant acquirers, retailers, and ATM deployers in more than 50 countries.
Together, these customers process over seven billion transactions annually,
originating from more than 100,000 ATMs and 500,000 POS terminals.

Postilion delivers a multi-channel platform that is functionally rich,
extremely flexible, SOA enabled and backed by proven world-class reliability,
availability, security, and performance. With a 15-year track record of
delivering innovative solutions, Postilion can assist in the introduction of
mobile banking, cross-border acquiring, and online payments. Postilion
solutions drive consumer-generated payments with support for EMV, contactless,
prepaid, and gift cards. Postilion offers PCI DSS certified and PA-DSS
compliant solutions.

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, 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.

SOURCE S1 Corporation

Cheyanne Atchley - Postilion, +1-512-336-3128, Cheyanne.Atchley@Postilion.com;
or Caroline Traylor - Porter Novelli, +1-512-241-2239,
Caroline.Traylor@PorterNovelli.com