Autonomy Has Fastest Archiving Revenue Growth Among the Top Six Suppliers

CAMBRIDGE, England and SAN FRANCISCO, June 8, 2010 - Autonomy Corporation plc (LSE: AU. or AU.L), a global leader in
infrastructure software for the enterprise, today announced that Autonomy was
the fastest-growing archiving software company of the top six market
providers in 2009, according to a new report from research firm IDC.
According to IDC's report titled "Worldwide Archiving Software 2009 Vendor
Shares(1)," Autonomy grew archiving revenues in 2009 by 17.3%, which reflects
a higher growth rate than its closest competitors.

IDC defines the archiving market as software that provides policy-based
controls for copying, moving, purging (delete from primary storage),
retaining (in read-only fashion for a defined period), and deleting (delete
from secondary storage) data. Some tools provide for more sophisticated
functions such as content-based data management, indexing, and
search/retrieval. Email and unstructured file archiving products are included
in this market. Not included are products that perform database archiving.

"The archiving market is emblematic of major trends taking place in
global business today," said Mike Lynch, CEO of Autonomy. "With eDiscovery
now an indispensable element of any organization's legal strategy, more
complex and numerous regulatory requirements, and increasing hardware storage
costs, organizations are looking for a better way to manage information. Only
Autonomy offers a meaning-based approach to archiving - resulting in lower
costs and a more precise and intelligent information governance platform for
companies. This has driven our strong growth in archiving, and helped
organizations world-wide better compete and operate in today's marketplace."

Autonomy provides a comprehensive next-generation archiving platform -
which includes both cloud-based and on-premise solutions and meets the
diverse archiving demands of all types and sizes of organizations. These
solutions include Autonomy Digital Safe, which manages the world's largest
cloud-based archive at over 14 petabytes, and the Autonomy Enterprise Archive
Solution (EAS), a highly scalable on-premise solution that captures and
preserves electronically stored information (ESI) for litigation readiness,
information governance, and storage optimization. Autonomy also offers
Autonomy Arcpliance, an on-premise digital archiving appliance that is ideal
for mid-sized businesses or organizations seeking a simplified yet scalable
solution for specific tasks - such as archiving application, divisional, or
location-specific data.

Powered by Autonomy's Intelligent Data Operating Layer (IDOL), Autonomy's
archiving solutions automatically ingest, de-duplicate, index and extract
metadata from files. Autonomy IDOL automatically understands how to manage
each piece of content, thus eliminating the burden of acquiring, implementing
and managing local compliance grade storage, including the time and cost
associated with backups, administration, software upgrades and technical
support.

About Autonomy

Autonomy Corporation plc (LSE: AU. or AU.L), a global leader in
infrastructure software for the enterprise, spearheads the Meaning Based
Computing movement. It was recently ranked by IDC as the clear leader in
enterprise search revenues, with market share nearly double that of its
nearest competitor. Autonomy's technology allows computers to harness the
full richness of human information, forming a conceptual and contextual
understanding of any piece of electronic data, including unstructured
information, such as text, email, web pages, voice, or video. Autonomy's
software powers the full spectrum of mission-critical enterprise applications
including pan-enterprise search, customer interaction solutions, information
governance, end-to-end eDiscovery, records management, archiving, business
process management, web content management, web optimization, rich media
management and video and audio analysis.

Autonomy's customer base is comprised of more than 20,000 global
companies, law firms and federal agencies including: AOL, BAE Systems, BBC,
Bloomberg, Boeing, Citigroup, Coca Cola, Daimler AG, Deutsche Bank, DLA
Piper, Ericsson, FedEx, Ford, GlaxoSmithKline, Lloyds TSB, NASA, Nestle, the
New York Stock Exchange, Reuters, Shell, Tesco, T-Mobile, the U.S. Department
of Energy, the U.S. Department of Homeland Security and the U.S. Securities
and Exchange Commission. More than 400 companies OEM Autonomy technology,
including Symantec, Citrix, HP, Novell, Oracle, Sybase and TIBCO. The company
has offices worldwide. Please visit www.autonomy.com to find out more.

Autonomy and the Autonomy logo are registered trademarks or trademarks of
Autonomy Corporation plc. All other trademarks are the property of their
respective owners.

(1) IDC, Worldwide Archiving Software 2009 Vendor Shares: Growth Fueled
by Cloud Offerings and Market Challengers, Doc # 223466, May 2010

    Autonomy Editorial Contacts:
    Randy Cairns                         Ian Bain
    Autonomy (US)                        The Red Consultancy (US)
    +1-408-953-7111                      +1-415-618-8806
    randy.cairns@autonomy.com            ian.bain@redconsultancy.com

    Edward Bridges                       David Vindel
    Financial Dynamics (UK)              The Red Consultancy (UK)
    +44-207-831-3113                     +44-207-025-6529
    edward.bridges@fd.com                david.vindel@redconsultancy.com

Randy Cairns of Autonomy (US), +1-408-953-7111, randy.cairns at autonomy.com; or Edward Bridges of Financial Dynamics (UK), +44-207-831-3113, edward.bridges at fd.com; or Ian Bain of The Red Consultancy (US), +1-415-618-8806, ian.bain at redconsultancy.com; or David Vindel of The Red Consultancy (UK), + 44-207-025-6529, david.vindel at redconsultancy.com, all for Autonomy Corporation plc