Integral Systems Announces Withdrawal of Shareholder Derivative Demand Letter

COLUMBIA, Md., Nov. 9, 2009 (GLOBE NEWSWIRE) -- Integral Systems, Inc.
(Nasdaq:ISYS) announced today that a shareholder derivative demand letter
submitted to the Company and its Board of Directors on behalf of shareholder
Harshad Patel has been withdrawn. The shareholder submitted the demand letter to
the Company's Board of Directors on March 3, 2009, alleging a breach of
fiduciary duty resulting from the Company's restatement of its interim financial
statements for the first three quarters of fiscal year 2008.

"We are pleased that this demand letter has been withdrawn so we can resume our
focus on the long-term growth of the business," commented Paul Casner, Chief
Executive Officer of Integral Systems.

ABOUT INTEGRAL SYSTEMS

Integral Systems, Inc., of Columbia, MD, applies more than 25 years experience
to provide integrated technology solutions for SATCOM-interfaced networks.
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) to deliver on time and on budget for more
than 250 satellite missions. Our dedication to customer service has solidified
long-term relationships with the U.S. Air Force, NASA, NOAA, and nearly every
satellite operator in the world. Integral Systems is listed in Forbes' Top 200
Small Companies in America for 2008. For more information, visit www.integ.com.

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CONTACT: Integral Systems, Inc.
Kathryn Herr,Vice President, Marketing and Communications
443.539.5118
kherr@integ.com