Autonomy Named a Leader in Online Testing by Independent Research Firm

Report Shows Autonomy Ranked Number One in Current Offering, Product Strategy, Corporate Strategy, and Market Presence

CAMBRIDGE, England and SAN FRANCISCO, August 17, 2010 - Autonomy Corporation plc (LSE: AU. or AU.L), a global leader in
infrastructure software for the enterprise, today announced that Autonomy has
been named a Leader in the August 2010 report, titled "The Forrester
Wave(TM): Online Testing, Q3 2010." Autonomy scored the highest in Current
Offering, Product Strategy, Corporate Strategy, and Market Presence.

    The Forrester Wave profile on Autonomy states:

    - "Autonomy Optimost is a component of Autonomy's Promote product line
      incorporating Web content management and the IDOL search and analysis
      platform. Autonomy's vision for integrating online testing into
      enterprise optimization is compelling in its breadth of application and
      depth of capability."

    - "Autonomy stands out in administration, deployment options, and breadth
      of testing techniques."

"Autonomy is focused on delivering innovative and powerful technology to
help marketers build persuasive, engaging, and compelling online experiences,
and we are pleased with the high marks we received in the Online Testing Wave
report," said Rafiq Mohammadi, CEO of Autonomy Promote. "Autonomy's Meaning
Based Marketing platform is based on the company's unique ability to
automatically understand the meaning, analyze, and act on all forms of
information, and powers a comprehensive portfolio of marketing applications
that will help businesses win market share and drive growth."

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 of Autonomy (US), +1-408-953-7111, randy.cairns at autonomy.com; or Louise Kehoe of 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