Antivirus and antispyware firm Webroot plans to acquire UK security vendor Email Systems. The acquisition will give Webroot a new line of 'software as a service' (SaaS) products to complement its existing security software.

Based in Westerham, Email Systems sells email, web and data archiving management services. The company also has offices in France, Sweden, Holland and Australia, and its services are used to manage 2.5 million mailboxes.

Following the acquisition, Webroot will sell Email Systems' web-based services under the brand name Webroot Email Security SaaS, a representative from Webroot's public relations agency said.

"Webroot Email Security SaaS will be an important piece to the layered security approach by offering levels of network protection beyond what an on-premise solution can provide," the spokesman wrote.

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