Autonomy is to acquire Zantaz, a provider of e-discovery and content archiving software, for $375 million in cash, the companies have announced.

Autonomy, of Cambridge, England, will operate Zantaz, of Pleasanton, California, as a division of Autonomy. Zantaz CEO Steve King will retain his position at the Zantaz division.

The publicly-traded Autonomy posted a net profit of $48 million on revenue of $250 million in 2006, while privately-held Zantaz reported $106 million in revenue, according to a May 2007 IDC research report.

E-discovery is an emerging market within the field of data storage, archiving and recovery. Organisations are increasingly being called upon to produce copies of electronic documents, such as email, voicemail and instant messages, to respond to lawsuits or government investigations.

IDC reports that the global market for e-discovery software and hosted services grew to $477 million in 2006, an increase of 47 percent from 2005's $330 million. The revenue split between software and hosted services is about 60-40, IDC reports.

The combination of Autonomy and Zantaz will bring together consolidated archiving, e-discovery, analytics and real-time policy management services into one system, the companies stated in a news release.

Autonomy says the acquisition will produce cost savings of $25 million a year and be accretive to earnings in six months. The deal is expected to close by August, assuming shareholder and regulatory approvals are granted.