Inmarsat Completes Strategic Acquisition Focused on Government Services Business

LONDON, November 23 - Inmarsat plc (LSE: ISAT), the world's leading provider of global mobile
satellite communications services, today announces the acquisition of the
business and assets of Segovia, Inc. ("Segovia"). Based in Virginia, in the
United States, Segovia is a leading provider of secure Internet protocol
managed solutions and services to the United States Army and other U.S.
military services and government agencies.

Segovia's expertise in designing, deploying and operating mixed satellite
and terrestrial networks in the military's challenging deployment and
training environments, coupled with its secure, dedicated IP network
infrastructure, have placed it at the centre of the Department of Defense's
("DoD") transformation and modernization initiatives. The trend within the
DoD towards end-to-end solution acquisition versus piecemeal component
acquisition is expected to drive demand for Segovia's managed solutions and
services in the coming years.

Andrew Sukawaty, Inmarsat's Chairman and CEO, commented: "We are
delighted to welcome Segovia into the Inmarsat group. Segovia is ideally
positioned to support the U.S. DoD's requirements to deploy secure networks
rapidly using combinations of satellite and terrestrial facilities wherever
in the world they are required. With Segovia's secure global communications
infrastructure and its highly qualified and security cleared staff, we will
further strengthen our relationships with key government customers across
land, maritime and aeronautical environments, and bring enhanced services
to the government sector generally."

Inmarsat will pay an initial consideration of US$110 million and may pay
additional amounts depending on future performance over the next three
years. Inmarsat expects to finance the transaction from current available
liquidity. For the year ended 31 December 2008, Segovia reported total
revenue of US$67 million and net income of US$18 million and had gross
assets of US$29 million.

After the transaction closes, which is expected in early 2010, current
Segovia executive management will operate Segovia as a separate business
reporting to Jim Parm, President and CEO of Stratos, Inmarsat's direct
distribution business. "Segovia brings superb technical and customer
service capability that has helped reshape the way the U.S. military solves
its network deployment challenges, and is complementary to Stratos'
existing government business," said Mr. Parm. "By adding Segovia's managed
services capability and secure network to our already strong position in
the government market, we will further our strategy of bringing essential
mobile and portable satellite communications solutions to the US DoD, the
largest customer for these services in the world."

"We are excited to be joining forces with Inmarsat and Stratos, and we
believe the combination will be the perfect platform for reaching the next
level in secure global IP networking," said Michael Wheeler, President and
CEO of Segovia. "This transaction will enhance Segovia's standing as a
premier supplier of secure network solutions to the U.S. Government."

Inmarsat was advised by RBC Daniels, a division of RBC Capital Markets
Corporation, on this transaction. Segovia was advised by Lazard.

About Inmarsat

Inmarsat plc (LSE: ISAT) is the leading provider of global mobile
satellite communications. Since 1979, Inmarsat has been providing reliable
voice and high- speed data communications to governments, enterprises and
other organizations, with a range of services that can be used on land, at
sea or in the air. The company's services are delivered through a global
network of approximately 400 distribution partners and service providers
operating in more than 100 countries. For the year ended 31 December 2008,
Inmarsat plc had total revenue of US$996.7 million (2007: US$576.5 million)
with an EBITDA of US$531.2 million (2007: US$388.1 million). For more
information, please visit www.inmarsat.com.

About Segovia

Segovia is a recognized leader in providing secure, global IP
communication solutions to the public and private sectors. For nearly a
decade, Segovia's existing global network infrastructure and innovative
business approach has yielded smarter solutions, delivered with greater
speed, reliability and customer focus. A trusted partner of the defense,
homeland security and emergency first-response communities, Segovia quickly
deploys end-to-end, mission-critical communications to support strategic and
tactical initiatives world-wide. Segovia is headquartered in Herndon, VA with
network assets and operations around the globe. To learn more, visit
www.segoviaIP.com or call +1-866-SEGOVIA.

Forward-looking Statements

Certain statements in this announcement constitute "forward-looking
statements" within the meaning of the U.S. Private Securities Litigation
Reform Act of 1995. These forward-looking statements involve risks,
uncertainties and other factors that may cause our actual results,
performance or achievements, or industry results, to be materially
different from those projected in the forward-looking statements. These
factors include: general economic and business conditions; changes in
technology; timing or delay in signing, commencement, implementation and
performance of programmes, or the delivery of products or services under
them; structural change in the satellite industry; relationships with
customers; competition; and ability to attract personnel. You are cautioned
not to rely on these forward-looking statements, which speak only as of the
date of this announcement. We undertake no obligation to update or revise
any forward-looking statement to reflect any change in our expectations or
any change in events, conditions or circumstances.

For further information, please contact: Chris McLaughlin, Inmarsat plc: Telephone: +44-20-7728-1015, Christopher_mclaughlin at inmarsat.com ; Alena Koci, Segovia, Inc.: Telephone: +1-703-621-0271, Alena.Koci at SegoviaIP.com .