ISYS Integral Systems, Inc. (MM)

Integral Systems, Inc., (Nasdaq:ISYS) today congratulated NASA and the Johns Hopkins University Applied Physics Laboratory (APL) for successfully inserting the MESSENGER probe into orbit around the planet Mercury.

"Integral Systems congratulates NASA and APL on the success of the MESSENGER mission as the MESSENGER probe became the first spacecraft ever to enter into orbit around the planet Mercury," said Paul Casner, CEO of Integral Systems. "MESSENGER has traveled almost five billion miles, completed 15 orbits of the sun and traveled at an average speed of 84,500 miles per hour on its way to Mercury. The recently published pictures of the surface of Mercury sent from MESSENGER are a testament to the remarkable engineering accomplishment."

Integral Systems has been an instrumental part of the MESSENGER program, providing its EPOCH Integrated Product Suite (IPS) satellite command and control software solution. EPOCH was used during the Integration and Test (I&T) phase to ensure the spacecraft's flight readiness and continues to support on-orbit operations.

Casner continued, "Integral Systems is proud to join NASA and APL in supporting the MESSENGER program. In conjunction with the MESSENGER team, we provided a cost-effective, commercial product-based solution that supports NASA's mission to develop low-cost, scientifically focused missions."

About Integral Systems

Integral Systems, Inc., is a global provider of products, systems and services for satellite command and control, telemetry and digital signal processing, data communications, enterprise network management and communications information assurance. We specialize in developing, managing and operating secure communications networks, both satellite and terrestrial, as well as systems and services to detect, characterize and geolocate sources of RF interference. Our customers include U.S. and foreign commercial, government, military and intelligence organizations. For almost 30 years, customers have relied on the Integral Systems family of companies (Integral Systems, Inc., Integral Systems Europe, Lumistar, Inc., Newpoint Technologies, Inc., RT Logic and SAT Corporation), as well as our services organization, Integral Systems Service Solutions (IS3), to design and deliver innovative commercial-based products, solutions and services that are cost-effective and reduce delivery schedules and risk. Our dedication to "The Integral Difference" has solidified long-term relationships with the U.S. DoD, NASA, NOAA and nearly every commercial satellite operator in the world. For more information, visit www.integ.com.

CONTACT: Company Contact:
         Andrew Miller
         Vice President, External Communications
         Integral Systems, Inc.
         Phone: 443.539.5124
         amiller@integ.com