Mac users had their biggest malware scare earlier this year, when , dubbed "scareware," were aimed at them.

Several antivirus companies, including Sophos, F-Secure and Intego, offer security software for the Mac.

Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at , or subscribe to . His e-mail address is .

in Computerworld's Security Topic Center.