Autonomy is #1 in Search and Discovery Market, According to Leading Market Research Firm

New Report Shows Autonomy's Market Share is 50% Greater Than the Next Closest Competitor, and Nearly Double the #3 Provider

CAMBRIDGE, England and SAN FRANCISCO, July 1, 2010 - Autonomy Corporation plc (LSE: AU. or AU.L), a global leader in
infrastructure software for the enterprise, today announced that IDC, a
leading research firm, reported that Autonomy owned the largest revenue share
in the worldwide search and discovery market in 2009.

According to IDC's report titled "Worldwide Search and Discovery 2009
Vendor Shares: An Update on Market Trends," Autonomy increased its market
share lead to 15.3% in 2009. This share represents a 50% lead over the next
closest keyword search competitor, Microsoft, and is nearly double that of
the third place vendor, Google.

The IDC report, written by Sue Feldman, Vice President for Search and
Technologies, and Hadley Reynolds, Senior Analyst, states that "Autonomy
continues to be the largest enterprise supplier, using its search-based IDOL
infrastructure to act as a foundation for content-centric and search-driven
business applications including eDiscovery and compliance, Web content
management, enterprise content management and rich media, search marketing,
intelligence, call center and customer support, and traditional knowledge
management applications."(1)

"Businesses from every industry continue to turn to Autonomy to help them
achieve what other technology companies fail to deliver on - identifying the
meaning within all forms of information, in real-time, in order to protect
and promote their organization," said Mike Lynch, CEO of Autonomy.
"Autonomy's unique meaning-based approach to information computing is what
continues to fuel our rapid growth and clear market leadership, as validated
by the recent IDC report on Search and Discovery market shares."

Autonomy's pan-enterprise search platform, the Intelligent Data Operating
Layer (IDOL), performs conceptual and contextual analysis and probability
matching on information to find the meaning within and the
inter-relationships between and among disparate pieces of content. This
unique approach allows global organizations to find and access the most
pertinent content for business value or risk management, irrespective of
languages, operating systems, and file types. By supporting more than 1,000
different data formats, including structured, semi-structured, and
unstructured data, located across 400 different content repositories,
Autonomy can search all categories of information repositories in an
organization, enabling companies to maintain compliance with government
regulations, such as the Federal Rules of Civil Procedure (FRCP). IDOL is
fault-tolerant using load balancing and mirroring, highly scalable, secure,
and has sub-second performance on billions of files.

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.

    Autonomy Editorial Contacts:

    Randy Cairns                         Louise Kehoe
    Autonomy (US)                        Ogilvy PR (US)
    +1-408-953-7111                      +1-415-677-2739
    randy.cairns@autonomy.com            louise.kehoe@ogilvypr.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

(1) IDC, Worldwide Search and Discovery 2009 Vendor Shares: An Update on
Market Trends, Doc # 223926, June 2010

US, Randy Cairns of Autonomy, +1-408-953-7111, randy.cairns at autonomy.com; or Louise Kehoe of Ogilvy PR, +1-415-677-2739, louise.kehoe at ogilvypr.com; or UK, Edward Bridges of Financial Dynamics, +44-207-831-3113, edward.bridges at fd.com; or David Vindel of The Red Consultancy, + 44-207-025-6529, david.vindel at redconsultancy.com, all for Autonomy