Press Release

ACI Worldwide Inc to Host Live Webcast of Investor Day

(NEW YORK — March 5, 2008) — ACI Worldwide, Inc. (NASDAQ: ACIW) announced today that it will hold an Investor Day Webcast on Monday March 10, 2008. Presentations by ACI’s management team are scheduled to begin at 8:30 a.m. EDT.

The live Webcast will be available on the ACI website at www.aciworldwide.com/investorrelations/.  An archived replay of the Webcast and presentation will also be available on the ACI website at www.aciworldwide.com/investorrelations/ approximately one hour after the event adjourns.

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 84 countries including many of the world's largest financial institutions, retailers and payment processors.  Visit ACI Worldwide at www.aciworldwide.com.