The move will expand Autonomy's portfolio of enterprise search, business process management, e-discovery and archiving products, moving it closer to becoming an enterprise content management provider.
Anthony Bettencourt, former chief executive of previous Autonomy acquisition Verity, will become divisional chief executive of Autonomy Interwoven, while Joe Cowan, formerly chief executive of Interwoven, joins Autonomy's group management reporting directly to founder and chief executive Mike Lynch.
"With this acquisition we will redefine how global 2000 corporations interact with the web, and how leading law firms and government regulators will discover, analyse and manage information and interactions," said Lynch.
"With the addition of Interwoven to the Autonomy group, the intelligence of Autonomy's Idol technology can be used to extend Interwoven's web content capabilities across 100,000 corporate web sites, intranets and extranets already powered by Interwoven."
However, commentators have warned that the integration of Idol with Interwoven's content management technology could take some time.
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