7 Macs, nothing protected. Don't need it. People try to use my leopard os x server at home and use it as a DoS attack zombie, but all it does is log their attempts because of how my firewall and Apache server are set up.

I'm forced to install Sophos for Mac on everything at work. 350+ systems. All it ever catches are harmless (to the mac) PC viruses in email... but... ONE TIME in 15+ years of supporting macs on a corporate scale, I encountered a trojan on a Mac system. The first paragraph of the virus definition specifically stated the only way to be infected is to intentionally install a video codec to watch porn. I know the guy was embarrassed. He was sitting right next to me and read the first paragraph with me. From that point on, I told him where to go and what to type. I wasn't touching that shit.