It's not my problem to scan for PC viruses on a Mac. If they get forwarded, anyone with a PC should have ALL their incoming email scanned (can't think of any reason why anyone with a PC would even CARE what platform the email comes from, ALL email should be scanned).
I've been on broadband ever since it first came out, with no virus protection software, still don't have or need any (OSX firewalls the OS automatically) and have NEVER got any malware, ever.
All my Macs have ever done is work... tirelessly, problem free. After all, I'm a musician, not a computer geek. I don't want to waste ANY time dealing with the tool... I just want it to do the job I bought it for. Making music!
Oh, and talking to you guys!
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An arranger is just a tool. What matters is what you build with it..!