S1 Corporate Banking Captures Three out of Five Best-in-Class Awards from Aite Group

S1 Corporate Banking Captures Three out of Five Best-in-Class Awards from Aite
Group

Awards Recognize Corporate Cash Management Solution Providers

NORCROSS, Ga., May 19, 2009 /PRNewswire-FirstCall/ -- S1 Enterprise, a
division of S1 Corporation (Nasdaq: SONE) and a leading global provider of
flexible, bank-centric solutions and payment services, today announced that S1
Corporate Banking was awarded three best-in-class awards by Aite Group in
their recent cash management report, "An Evaluation of Leading U.S. Cash
Management Vendors: The Focus on Usability." Aite rated S1 Corporate Banking
as the top vendor in the following categories: Solution with the Highest Level
of Usability; Greatest Depth of Functionality; and The Vendor to Watch during
2009. S1 received more awards than any participating cash management solution
provider.

"S1 Corporate Banking has ricocheted ahead of any other solution in the
marketplace in terms of usability," Christine Barry, research director for
Aite Group and author of the cash management evaluation, wrote in the report.
"Incorporation of Web 2.0 and widgets in their dashboard and the ability for a
user-defined interactivity in their Information Reporting module moves S1
Corporate Banking considerably ahead in terms of user experience."

"Our customer's input plays an essential role in our success. The S1
development team has worked hand-in-hand with top banks worldwide to build a
best-of-breed product," said Fred Dumas, General Manager, S1 Treasury Online
Group. "Aite's recognition of 'S1 as the Vendor to Watch in 2009' speaks to
our significant investment in customer satisfaction and product development."

S1 Corporate Banking is a third generation J2EE solution employing the latest
technologies to fully engage users in their online banking experience. The
latest release of S1 Corporate Banking included an Interactive Information
Reporting module that allows users to customize the appearance of their prior
day and current day report information, execute advanced data aggregation and
complex calculations, and perform advanced sorting and filtering of account
information.

Other recent additions to S1 Corporate Banking include a Business Dashboard
and a Global Payments Framework. The Business Dashboard provides "drag and
drop" widgets to the most relevant data and functions for quick access to
account balance metrics, reporting and transaction capabilities, items needing
immediate attention, and shortcuts to transaction initiation functions. The
Global Payments Framework allows S1 Enterprise and its customers to easily add
new country specific payment methods. Based on SOA principles, the Global
Payments Framework supports open standards based web services, enabling
maximum flexibility and ensuring technology alignment with current and
emerging standards.

S1 has twenty years experience providing cash management and trade finance
solutions to the world's largest banks. S1 Corporate Banking provides an
integrated Global Payments Framework supporting diverse domestic and
international payments, including wire transfers, account transfers, ACH and
localized payments for over twenty countries. In addition to comprehensive
payment services, S1 Corporate Banking offers a rich, highly flexible
user-interface, extensive security and entitlement features like multi-factor
authentication, bulk file transfers, check services, and complete information
reporting.

S1 Trade Finance allows banks to provide their import/export customers robust
online capabilities including Letters of Credit, Open Account, Standby Letters
of Credit, Guarantees, Purchase Order Processing, Discrepancy Notifications,
Documentary Collections, Transfer Letters of Credit, Assignments of Proceeds
and document imaging.

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 global 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. Additional information about S1
Enterprise is available at www.s1enterprise.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.

About Aite Group
Aite Group is a leading independent research and advisory firm focused on
business, technology and regulatory issues and their impact on the financial
services industry. It was founded by leading industry experts in Banking and
Securities & Investments. Aite Group brings together a team of business
strategy, technology and regulatory experts to deliver comprehensive, timely,
and actionable advice to financial institutions and technology vendors. It
seeks to become a true partner, advisor, and catalyst by exchanging ideas and
challenging basic assumptions to ensure that our clients always stay one step
ahead of the competition.

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

Missy Rose of S1 Enterprise, +1-704-423-2504, missy.rose@s1.com; or Jorge
Lavina of Cooper Katz & Co., Inc., +1-917-595-3047, or +1-917-386-4213,
jlavina@cooperkatz.com