ACI Helping Network International Become First Multi-Application Smart Card Provider in Middle East; ACI Smart Chip Manager Software Supports Network International Migration to EMV.

WATFORD, England -- ACI Worldwide (Nasdaq:TSAI), a leading international provider of enterprise e-payment solutions, has licensed ACI Smart Chip Manager(TM) to Network International, the leading credit card and payment services provider in the Middle East. Using ACI Smart Chip Manager, Network International will be the first provider in the Middle East to issue multiple application smart cards with both payment and loyalty functionality. ACI's software will also help Network International with its Europay, MasterCard and VISA (EMV) migration.

In order to seize market share, Middle East banks are continually striving to introduce new and innovative services to their customers. With the January 2006 EMV deadline approaching, the more advanced banks are introducing multiple applications on chip cards as part of their EMV migration. Network International continually strives to create and maintain competitive advantage in the region by offering advanced services to its bank customers and looked to ACI to provide differentiation through innovative card technology.

Network International is the first card provider in the Middle East to offer EMV compliant debit cards featuring an integrated loyalty application. By combining the enhanced security of EMV with a new delivery channel for customer loyalty, Network International enables its customers to deliver value-added services to the end user. Network International has worked with ACI Worldwide for 13 years and currently employs ACI's flagship BASE24(R) payments software to handle transaction processing. Network International required a proven, flexible infrastructure that would enable it to introduce additional services to its customers securely via the EMV chip cards.

"The flexibility and scalability of ACI's Smart Chip Manager enables us to issue and develop EMV chip cards in-house, giving our existing and prospective customers the ability to outsource end to end card personalisation services," said Abdulla Qassem, chairman Network International and chief technology /operations manager of Emirates Bank International. "Smart Chip Manager integrates seamlessly with BASE24 to help us introduce new, value-added services and functionality to satisfy existing customers and acquire new ones."

Supported by ACI's local office in Bahrain, ACI Smart Chip Manager will help Network International manage the lifecycle of chip cards and update application parameters. It will also support personalisation of any smart card and the post-issuance of new applications to card schemes.

"ACI has been making significant inroads with Middle Eastern banks and card providers in their EMV migration efforts," said Richard Launder, managing director at ACI Worldwide (EMEA). "Our experience with organisations worldwide is that some find it difficult to justify the cost of EMV migration beyond reducing fraud. Network International is proof that investment in EMV can also be used for customer retention and acquisition by introducing multiple applications on the chip cards. We are proud that ACI's software has been selected to support Network International's innovative multi application EMV smart card project."

About Network International

A wholly owned subsidiary of the Emirates Bank Group, Network International was established as an independent credit card services company in 1994. We have since evolved into a leading credit card and payment services company committed to meet the needs of financial institutions, corporate businesses and individuals alike. For further information, visit www.networkuae.com.

About ACI Worldwide

Every second of every day, consumers are initiating electronic payment transactions--getting cash at ATMs, using debit and credit cards to make purchases in stores and on the Internet, banking by phone and PC, and paying bills online. Over 45 billion times a year, ACI software is used to process these transactions, powering the world's online payment systems. ACI was founded in 1975 and pioneered the development of applications and networking software for online transaction processing. Today more than 500 customers in 78 countries use ACI supplied software. Visit ACI Worldwide on the Internet 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 Transaction Systems Architects, Inc.'s ("TSA"), 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 and other risk factors, interested parties should review the Company's filings with the Securities and Exchange Commission, including the Company's Form 10-K filed on December 14, 2004, the Company's Form 10-Q/A filed on February 18, 2005, and the Company's 10-Q filed on May 10, 2005.