DAVE v6.2 and ADmitMac v3.2

ARLINGTON, TEXAS – May 31, 2006 – Thursby Software Systems, Inc. (Thursby
Software) announced today that it has released new versions for both of its
leading Macintosh network suites, DAVE and ADmitMac.

DAVE v6.2 and ADmitMac v3.2 have both been updated to be fully compliant
with Apple’s new line of Intel-based Macintosh computers. The universal
binary update for both Intel and PowerPC platforms is available as a
no-cost upgrade from Thursby’s web site (www.thursby.com) for customers
running the most current releases of the software.

Bill Thursby, company president, states “this release contains much more
than Intel compatibility; it includes numerous PowerPC performance and
stability enhancements that have been developed through an extended beta
test and is a recommended update for all of our customers.”

This release continues Thursby’s commitment to the highest levels of
network security and includes the required interfaces for future support of
industry standard smart cards and the U.S. Department of Defense Common
Access Cards (CAC).

Thursby Software Systems, Inc. of Arlington, Texas, has been developing,
supporting and marketing a wide variety of connectivity solutions worldwide
since 1986. The company can be contacted at 1.817.478.5070, by Internet
e-mail: sales@thursby.com or www.thursby.com