ACI Releases New Version of Payments Software With System z Optimization, Helps Financial...

ACI Releases New Version of Payments Software With System z Optimization, Helps
Financial Institutions Meet Aggressive Growth Plans

NEW YORK, July 31, 2008 (PRIME NEWSWIRE) -- ACI Worldwide, Inc. (Nasdaq:ACIW), a
leading international provider of software for electronic payment systems, today
announced the latest version of BASE24-eps(tm), the company's market-leading
software for online payments processing. BASE24-eps Release 1 Version 08.2
offers standard support for IBM's "blue stack" database, middleware and security
capabilities on the IBM System z platform. It also features enhanced security
and a more flexible infrastructure to easily accommodate future updates and
compliance regulations such as the latest Payment Card Industry (PCI) Data
Security Standard (DSS). Today's announcement marks a significant milestone in
the strategic alliance announced by ACI and IBM in December 2007. One of the
hallmark goals of the alliance included technology solutions to help financial
institutions meet aggressive growth objectives. ACI's payment engine will bring
IBM's flagship mainframe capabilities to front-end systems, priming these
complex and disparate networks for the industry's most powerful virtualization,
security and scalability.

BASE24-eps offers optimized enablement of IBM System z blue stack components
including DB2, WebSphere MQ, application management, and security. The new
version provides system enhancements to the communication services running in a
z/OS environment. It also enables application management processes to run in a
z/OS environment and to integrate with IBM's Tivoli Monitoring solution.

Security upgrades offer support for IBM's Crypto Express2 for cryptographic
services and integration with RACF for access control and auditing associated
with z/OS users and WebSphere MQ resources.

ACI enhanced the infrastructure of BASE24-eps to ease the work associated with
maintaining the software as customers respond to evolving market requirements.
New Version 08.2 interfaces expand connectivity to regional networks worldwide
such as France, Spain, United Arab Emirates and Indonesia. The software is used
to manage electronic payment devices, acquire transactions, and perform
high-volume switching, routing and authorization services.

Mark Vipond, president of global products at ACI, said, "Shaped by input from
our global customer base, Version 08.2 offers our clients a more flexible
payments solution that now combines ease of manageability with industry-leading
performance and scalability. We are aligned with IBM to help customers deploy
the software with dedicated implementation teams that will allow customers to
take full advantage of BASE24-eps on IBM's System z platform."

About ACI Worldwide, Inc.

ACI Worldwide is a leading provider of electronic payments software and services
to major banks, retailers and processors around the world. The company's
solutions enable online payment processing, online banking, fraud prevention and
detection, and back office services such as settlement, account management, card
management and dispute processing. ACI solutions provide market-leading levels
of reliability, manageability and scale to over 800 customers in 88 countries.
Visit ACI Worldwide at www.aciworldwide.com.

Any statements in this press release regarding projected results are preliminary
and "forward-looking statements" within the meaning of the Private Securities
Litigation Reform Act of 1995. In addition, this press release may contain other
forward-looking statements including statements regarding ACI Worldwide
Incorporated, its subsidiaries or third parties' expectations, predictions,
views, opportunities, plans, strategies, beliefs, and statements of similar
effect. The forward-looking statements in this press release are subject to a
variety of risks and uncertainties. Actual results could differ materially.

For a detailed discussion of these risk factors, parties that are relying on the
forward-looking statements should review the Company's filings with the
Securities and Exchange Commission, including the Company's Form 10-K filed on
January 30, 2008, the Company's Form 10-Q filed on February 19, 2008, both as
amended by the Form 10-K/A and Form 10-Q/A, respectively, filed on March 4,
2008.

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CONTACT: ACI Worldwide
Jim Maxwell
402.390.8906
jim.maxwell@aciworldwide.com