AUTONOMY EXPECTS TO REPORT Q3 2008 RESULTS SIGNIFICANTLY AHEAD OF CONSENSUS ESTIMATES

CAMBRIDGE, England - 3 October 2008 - Autonomy Corporation plc (LSE: AU. or AU.L), a global leader in infrastructure software for the enterprise, today announced that it expects to report record third quarter 2008 results, with revenues and earnings per share (adjusted) ahead of consensus estimates and at or above the top end of the range.¹

Commenting on the quarter, Dr. Mike Lynch, Group CEO of Autonomy said today: "We are pleased to see continued strong trading in our business, to an extent that the usual Q3 seasonal weakness was not evident resulting in exceptional quarter-on-quarter revenue, profit and operating margin growth. The third quarter saw accelerating organic growth, with significant regulatory-driven demand, whilst maintaining the backlog at record levels, together with record cash collection from our blue chip customer base."

These results are preliminary and subject to the usual quarterly financial review by Autonomy's independent auditors.

About Autonomy Corporation plc

Autonomy Corporation plc (LSE: AU. or AU.L) is a global leader in infrastructure software for the enterprise and is spearheading the meaning-based computing movement. 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, be it text, email, voice or video. Autonomy's software powers the full spectrum of mission-critical enterprise applications including information access technology, pan-enterprise search, information governance, end-to-end eDiscovery and archiving, records management, business process management, customer interaction solutions, and video and audio analysis, and is recognized by industry analysts as the clear leader in enterprise search.

Autonomy's customer base comprises of more than 17,000 global companies and organizations including: 3, ABN AMRO, AOL, BAE Systems, BBC, Bloomberg, Boeing, Citigroup, Coca Cola, Daimler Chrysler, Deutsche Bank, Ericsson, Ford, GlaxoSmithKline, Lloyd TSB, NASA, Nestle, the New York Stock Exchange, Reuters, Shell, 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 350 companies OEM Autonomy technology, including BEA, Citrix, EDS, H-P, Novell, Oracle, Sybase and TIBCO, and the company has over 400 VARs and Systems Integrators. The company has offices worldwide.

¹ Source: Bloomberg, Sept. 30, 2008, excluding outlier estimate.

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