ACI Expands Reach in Latin America with Optimisa S.A. Distribution Partnership; ACI Worldwide Designates Specialized Integrator as Distributor for Chilean Market.

OMAHA, Neb. -- ACI Worldwide (NASDAQ:TSAI), a leading international provider of enterprise payment solutions, today announced an agreement with Optimisa S.A. to serve as ACI's distributor within the Chilean market. Optimisa, a systems integrator specialized in critical systems, exemplifies ACI's commitment to the Chilean market by providing localized distribution and support of ACI's entire portfolio of world class payment solutions.

"We chose Optimisa because of its experience in the Chilean market and the quality of their execution and support," said Lyle Knox, Vice President and Managing Director, ACI Latin American Operations. "ACI now has local support for our existing and emerging products, ensuring continuity for our customers in Chile."

ACI software runs the three bank-owned ATM networks in Chile and the only bank-owned POS acquiring network. The stability and growth of the Chilean economy, as well as the aggressive expansion of its retail sector provide many opportunities for the ACI product set to expand its presence among its traditional banking customers and in other sectors of the Chilean market.

"This agreement expands our capacity to deliver mission critical solutions to our customers and allows us to continually support our customers as their businesses continue to evolve," said Alfredo Piquer, chairman of the board, Optimisa.

About Optimisa S.A.

Optimisa S.A. is a major systems integrator, headquartered in Chile, specializing in mission critical systems. Founded in 1986, Optimisa specializes in the high engineering standards required to architect, design, configure, develop, test, operate and support mission critical systems. Product solutions include a variety of industries including banking, Internet, government, retail and manufacturing. Visit Optimisa at www.optimisa.cl.

About ACI Worldwide

Every second of every day, ACI solutions are at work processing electronic payments, managing risk, automating back office systems and providing application infrastructure services. Founded in 1975, ACI is a leading international provider of solutions for consumer and wholesale banking, retail and cross-industry systems. ACI serves more than 800 customers in 83 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, 2005.