Press Release

(New York, N.Y. – 19 May 2008) – ACI Worldwide (NASDAQ: ACIW), a leading international provider of software for electronic payment systems, today announced that Empire National Bank, headquartered in Islandia, New York, has selected ACI to provide online banking services for their business and retail customers. The newly formed Long Island-based bank has established ACI Enterprise Banker™ as the core of its online banking system, and available services will include information reporting, stop payment, ACH origination, wire transfer, internal transfer, and positive pay. The product operates in the ACI On Demand hosted services environment, relieving the bank of the technical burden of system implementation and ongoing maintenance.

“Empire National Bank fills a void in the local banking landscape that has been created by recent bank consolidations,” said Douglas C. Manditch, chairman and CEO of the bank.  “Our mandate is to bring the personal touch back to customer service while providing cutting-edge products that rival what is offered by our largest competitors.  ACI Enterprise Banker is an ideal match for Empire National Bank.  Enterprise Banker provides the same robust online banking services used by some of the largest banks in the country.  By deploying Enterprise Banker in the ACI On Demand environment, we are able to leverage ACI’s technical expertise and focus our financial and human resources on customer service.” 

 “We are very pleased to have been selected by Empire National Bank to provide online banking services to their business and retail customers,” said Ralph Dangelmaier, president of the Americas at ACI Worldwide.  “Enterprise Banker’s single-product solution uniquely positions Empire National Bank to support the needs of what is sure to be a rapidly growing customer base.  Enterprise Banker is fully scalable and can be customized to meet the online banking requirements of the smallest retail customer up through sophisticated, large corporations.  As customer needs change, the bank can easily cross-sell additional services, all within the same product offering.  Additionally, Enterprise Banker gives them the unique ability to tailor product packages to meet the specific needs of niche target markets, such as property managers, attorneys and healthcare providers.”

About Empire National Bank

Empire National Bank is a recently formed bank based on Long Island, New York.  Empire National Bank is locally-owned and operated, and it specializes in serving privately owned small and mid-size businesses throughout Long Island.  The bank has established its headquarters in Islandia, New York, and it also has a branch office in Shirley, New York.  Empire National Bank began operation in February 2008.

Empire National Bank was created in response to demand from small and mid-sized businesses and local residents for a new community bank that understands and serves their specific needs.  Empire National Bank offers a total package of deposit, loan, and cash management products with an emphasis on customer service.  Learn more about Empire National Bank at www.empirenb.com.

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.