Autonomy Named a Leader in Message Archiving Software by Independent Research Firm

Autonomy Scored the Highest in Current Offering, Vision & Product Strategy and Services

CAMBRIDGE, England and SAN FRANCISCO, March 14, 2011 - 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 March 2011 report by Forrester Research Inc.,
titled "The Forrester Wave(TM): Message Archiving Software, Q1 2011."
Autonomy scored the highest in the Current Offering category, which includes
message capture, range of content types supported, message management,
supervision, scalability, security and deployment flexibility, as well as in
the Vision and Product Strategy and Services categories.

The Forrester Wave(TM) profile on Autonomy states:

    - "Autonomy Consolidated Archive offers the most complete product
      evaluated and it receives top marks for message capture, range of
      content types supported, message management, and supervision
      functionality. The vendor's rich set of deployment models and depth of
      integrated eDiscovery functionality contribute to Autonomy's leadership
      position."
    - "(Autonomy's) strong set of flexible message archiving offerings and
      first-class legal risk mitigation support contribute to its leadership
      position."

"The tremendous success of Autonomy's Consolidated Archive is the result
of our unique vision for a next-generation archiving solution. We are very
pleased with the high scores we received in the Message Archiving Wave
report," said Mike Sullivan, CEO of Autonomy Protect. "Only Autonomy can
automatically apply governance policies by understanding the meaning of all
types of human friendly information, including audio, video and social media
content. With Autonomy Consolidated Archive as the anchoring technology,
organizations can drive their critical compliance, eDiscovery, and Records
Management initiatives directly from the archive, and make the data available
via an on-premise, cloud-based, hybrid, or appliance-based approach."

Please visit www.autonomy.com/forresterarchivingwave for more
information.

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, 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:

    Winifred Shum                        Louise Kehoe
    Autonomy (US)                        Ogilvy PR (US)
    +1-408-771-6668                      +1-415-677-2739
    wshum@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

Winifred Shum of Autonomy (US), +1-408-771-6668, wshum at autonomy.com; or Louise Kehoe of Ogilvy PR (US), +1-415-677-2739, louise.kehoe at ogilvypr.com, for Autonomy Corporation plc; or Edward Bridges of Financial Dynamics (UK), +44-207-831-3113, edward.bridges at fd.com, for Autonomy Corporation plc; or David Vindel of The Red Consultancy (UK), +44-207-025-6529, david.vindel at redconsultancy.com, for Autonomy Corporation plc