SAN FRANCISCO--Symantec has acquired Web security firm Mi5 Networks and plans to announce two new security suites at the RSA security conference on Tuesday.

Mi5 sells a Web security appliance that protects corporations against Web-based threats. Symantec will integrate the technology into its offerings later in 2009 and offer it as a stand-alone product, Joan Fazio, director of product marketing for Symantec Endpoint Security, said in an interview.

The all-cash transaction was completed in March, she said, declining to disclose the terms.

The company also is announcing Symantec Protection Suite Small Business Edition, Symantec Endpoint Protection Small Business Edition, which is part of that suite, and a separate Symantec Protection Suite Enterprise Edition, all scheduled to be available in the summer.

The Protection Suite Small Business Edition suite offers protection against malware and spam and helps companies quickly recover their client systems. Protection Suite Enterprise Edition includes messaging and endpoint security, as well as system backup and recovery technologies.

Symantec Endpoint Protection Small Business Edition includes built-in tools like a client installation wizard and a streamlined user interface to simply deployment.