Webroot has said it will acquire Email Systems, a provider of email and web security services.

The acquisition, set to be announced today, will give Webroot a new line of "software as a service" (SaaS) products to complement its existing security software. Webroot sells a popular anti-spyware program called Spy Sweeper.

Based in the UK, Email Systems sells email, web and data archiving 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, said a Webroot spokesman.

"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 said.

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