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

Company Continues to Strengthen Position as De Facto Standard for Sophisticated, Strategic Search

CAMBRIDGE, England and SAN FRANCISCO, November 23, 2010 - Autonomy Corporation plc (LSE: AU. or AU.L), a global leader in
infrastructure software for the enterprise, today announced that Autonomy
received the highest ranking in Ovum's 2010 Decision Matrix for Enterprise
Search and Retrieval (ESR). The report evaluated twelve vendors including
Endeca, Exalead, Google, IBM, Microsoft, Oracle, Recommind, and Vivisimo, and
named Autonomy the clear leader in the ESR market.

The Ovum report, which states "the ESR market is growing at a rapid
pace," says the following about Autonomy:

"Autonomy is the clear leader of the ESR market and is an automatic
shortlist into any vendor selection exercise … it is a natural fit for
organizations that are looking at ESR from a strategic perspective."

"The vendor is an order of magnitude larger than most other peers in ESR
and delivers the most sophisticated and comprehensive search functionalities
among peers."

The Ovum report is another example of Autonomy's continued momentum as
the clear leader in sophisticated, strategic enterprise search. As reported
in Autonomy's recent Q3 2010 earnings, the company's OEM business grew by 30%
year-on-year, signing twelve Intelligent Data Operating Layer (IDOL) deals in
the most recent quarter. Autonomy also secured 20 transactions with customers
over $1 million in Q3 2010. Both metrics point to the powerful "network
effect" of Autonomy's sophisticated search technology - as high-technology
companies and customers alike are increasingly turning to Autonomy to power,
promote, and protect their products and their organizations - further
strengthening Autonomy's position as the market-leader in high-end search.

"We are pleased to see that Ovum has recognized the transition from the
days of legacy keyword search to a new era of meaning-based technologies in
its report," said Mike Lynch, CEO of Autonomy.

Please visit www.autonomy.com for a complimentary copy of Ovum's
2010 Decision Matrix for Enterprise Search and Retrieval report.

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. IDC recently recognized Autonomy as having the largest
market share and fastest growth in the worldwide search and discovery market.
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, Deutsche Bank, DLA Piper, Ericsson,
FedEx, Ford, GlaxoSmithKline, Lloyds Banking Group, NASA, Nestlé, 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

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