Press Release

(NEW YORK — July 23, 2008) — ACI Worldwide, Inc. (NASDAQ: ACIW) today announced that it will hold a conference call on August 12, 2008 at 8:30 am EDT to discuss the June 30, 2008 quarterly financial results. Interested persons may access a real-time audio broadcast of the teleconference at www.aciworldwide.com/investors or use the following numbers for dial in participation: US/Canada: (800) 340-8364, International/Local: (706) 634-2207. Please provide your name, the conference name ACI Worldwide, Inc. and conference code 57035367.

There will be an encore replay available for two weeks on (800) 642-1687 for US/Canada Dial-In and (706) 645- 9291 for International/Local Dial-In participants.

About ACI Worldwide, Inc.

Every second of every day, ACI Worldwide solutions are at work processing electronic payments, managing risk, automating back office systems and providing application infrastructure services.   ACI is a leading international provider of solutions for banking, retail and cross-industry systems.  ACI serves more than 800 customers in 88 countries including many of the world's largest financial institutions, retailers and payment processors.  Visit ACI Worldwide at www.aciworldwide.com.