10-Year Relationship with ACI Helps Industry and Construction Bank React to Rising Card Use in Russia; ACI's Flagship BASE24 Payments Software Delivers Flexibility in Fast-Changing Market.

WATFORD, England -- ACI Worldwide (Nasdaq:TSAI), a leading international provider of enterprise payment solutions, recently commemorated 10 years with the Industry and Construction Bank of St. Petersburg. ICB, a leading regional bank, uses BASE24(R) software to provide a flexible and resilient solution that copes with the continued growth in transaction volumes - from 1.1 million transactions per month in 1999, to four million per month in 2004. Card circulation in Russia has grown from 4.5 million in 1998 to 18.5 million in 2003. The scalability of ACI software has enabled ICB to react quickly to this expanding market.

As the Russian market has grown so have the expectations of ICB's customers. ATM and POS solutions have had to develop from simple payment transaction processing to include wider functionality. ACI's software has allowed ICB to accommodate this change with its Mobile Top-up functionality, facilitating ICB's increased revenue channels while maintaining the speed and security of its traditional transaction processing.

"ACI has provided us a robust, reliable and efficient solution which serves our growing business needs to the highest standards," said Sergey Bochkarev, Deputy Chairman of the Board at ICB. "With the Russian banking market developing quickly, ACI's solution is a strategic investment for the future. We know our customers desire speedy and secure transactions and we are glad that ACI has helped us to provide just that."

"BASE24's core values of scalability, flexibility and reliability have helped ICB deliver an excellent service over the past decade," said Richard Launder, managing director, ACI Worldwide. "We look forward to continuing our work with ICB to provide banking services of the highest quality, and are confident our solutions will respond well to the evolving Russian market."

About ACI Worldwide

ACI Worldwide is a leading international provider of solutions for consumer and wholesale payments and application infrastructure. ACI serves more than 800 customers in 84 countries including many of the world's largest financial institutions, retailers and payment processors. 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, the Company's 10-Q filed on May 10, 2005, the Company's Form 8-K filed on July 1, 2005, the Company's Form 10-Q filed on August 9, 2005, the Company's 8-K filed on October 7, 2005, and the Company's 8-K filed on October 25, 2005.