Telesat Picks Integral Systems for SkyTerra Satellite Command and Control

Integral's EPOCH IPS Software Now Supports 16 Boeing 702 Satellite Programs

COLUMBIA, Md., June 24 /PRNewswire-FirstCall/ -- Integral Systems, Inc.,
(Nasdaq: ISYS), announced a contract with Telesat of Ottawa, Canada, under
which Integral will provide its EPOCH Integrated Product Suite (IPS) of
satellite command and control software to support the SkyTerra1 and SkyTerra2
satellites under construction by Boeing. With this contract, Telesat adds to
an existing EPOCH control system currently supporting nine satellites it owns
and operates. The SkyTerra satellites will be the 15th and 16th Boeing 702
satellites supported by EPOCH IPS, and the 23rd Telesat satellite program
supported by Integral Systems.

In addition to providing command and control software for SkyTerra satellites,
Integral Systems is implementing a complete set of executable operating
procedures for the satellite bus based on Boeing's Recommended Operating
Procedures. These automated procedures are implemented using Integral Systems'
Automated Real-Time Execution Suite (ARES) procedure platform that delivers
the capability to rapidly develop and execute complex spacecraft command
procedures.

Telesat's experienced operations staff will develop payload procedures and
perform validation of the bus and payload procedures to ensure operational
readiness. Telesat will assume operational control of the SkyTerra satellites
at completion of in-orbit testing.

"Telesat is an industry leader in satellite services and space operations and
we are pleased to build on the 13 year partnership between our two companies
by providing both the ground system and executable ARES satellite procedures
for SkyTerra's satellites," said Mark Schmitt, Vice President, Integral
Systems American Operations.

"The existing capability of EPOCH IPS to Boeing 702 satellite operations is
unrivaled. Integral's technical capability to support development of satellite
bus operating procedures and custom interfaces to the SkyTerra ground systems
combined with Telesat's operational expertise to develop the payload
procedures and to perform system validation will allow Telesat to provide a
reliable and cost effective solution for SkyTerra," said Ken Skublics,
Director of Space Programs and Operations at Telesat.

About Integral Systems
Integral Systems, Inc., 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 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
US 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.

ABOUT TELESAT
Headquartered in Ottawa, Canada, with offices and facilities around the world,
Telesat is the fourth-largest fixed satellite services operator. The company
provides reliable and secure satellite-delivered communications solutions to
broadcast, telecom, corporate and government customers. Telesat has a global
state-of-the-art fleet of 13 satellites, with another satellite under
construction, and manages the operations of 13 additional satellites for third
parties. Telesat is privately held. Its principal shareholders are Canada's
Public Sector Pension Investment Board and Loral Space & Communications Inc.
(Nasdaq: LORL).

ABOUT SKYTERRA COMMUNICATIONS
SkyTerra Communications (OTC Bulletin Board: SKYT) delivers mobile wireless
voice and data services primarily for public safety, security, fleet
management and asset tracking in the U.S. and Canada. The company's
next-generation integrated satellite-terrestrial communications network is
expected to provide seamless, transparent and ubiquitous wireless coverage of
the United States and Canada to conventional handsets. When completed, the
network will support communications in a variety of market segments, including
public safety, homeland security, telematics, transportation and
entertainment, by providing a platform for interoperable, user-friendly and
feature-rich voice and high-speed data services. For more information visit
www.skyterra.com
Company Contact: Media Contact:
Kathryn Herr Andrew Miller
Vice President, Marketing and Zeno Group for Integral Systems
Communications Phone: 707-386-1193
Integral Systems, Inc. andrew.miller@zeno.com
Phone: 443.539.5118
kherr@integ.com

SOURCE Integral Systems, Inc.

Company Contact: Kathryn Herr, Vice President, Marketing and Communications of
Integral Systems, Inc., +1-443-539-5118, kherr@integ.com, or Media Contact:
Andrew Miller of the Zeno Group for Integral Systems, +1-707-386-1193,
andrew.miller@zeno.com