I am currently using the latest version of Norton Anti Virus on my 2001 G4 QuickSilver 1.47Ghz (OWC), 1.5GB RAM, 580GB HDD, OS 10.4.1. I am not having any problems whatsoever. That being said, I also do not use ANY other Symantec products on my system.
NAV regularly catches Macro Viruses thru email, and on one occasion several years ago, also caught a Mac virus when a friend brought a resume on floppy disk from a publishing company he had been to. Wanted my help editing the resume, but before we even got started, NAV to the rescue, and the Mac virus was gone.
I tend to agree with others in this forum, MacFixIt Forums, and Apple Forums: I do actually have friends who own Windows PCs. I do NOT relish playing the role of Typhoid Mary, passing some deadly virus or trojan to others, simply because they didn't choose an O/S as safe as mine is. I consider that being responsible, and helping to stop the flow of malware around the world, instead of just being a conduit for it all.
Okay, I've put on my flame-retardant Nomex suit. I'm ready for answers about those of us who actually protect our Macs against infection, or refuse to pass on the malware of less sophisticated operating systems.
Regards,
Albert