The first Mac botnet is already launching DDoS attacks against some website, which penetrated Macs via tainted copies of iWork '09 and Photoshop CS4. Just like what we told you about in January. Be careful when you pirate stuff. [ZDNet via NYT]
Macs have had viruses since System 7. Symantec Anti-Virus was available for my old Mac IIsi, and I ran it then.
I've since had PCs, and I've found NUMEROUS problems with the various "security" software out there.
Most "security" software such as Norton 360, McAfee, AVG, Trend Micro PC-Cillin, etc. now come with that wondrous device, the firewall. It also comes with this WONDERFUL (insert heavy sarcasm here) window that pops up and says, "Do you want to allow or deny access to the internet?" Most people don't pay attention to this when they have those great patches/system updates, and so when they get a new version of their internet browser or a system patch that requires access to the internet, it causes this window to pop up. And of course, most people panic and go, "I want to deny access for this program!" Wow, look...You've now denied access for your browser to get online.
Mac, with its viruses that range in the smaller numbers of the triple digits, vs. the PC with its viruses that range in the hundreds of thousands, tends not to need the security software to "protect" it. I'm not saying it's invulnerable (this story shows that there ARE viruses out there for the Mac), but let's face it, it doesn't have the higher percentage that the PC does.
And no, I am NOT an Apple Fanboy. I'm an Internet tech support rep who owns 3 PCs (running WinXP and Vista), and every day I work, I get a call from a customer who has some form of firewall, antivirus, or security software that is blocking their connection. I have yet to see it on a Mac, in the 4 years I have been doing this job, as Mac users generally DON'T have a firewall that they turn on (and if they do turn it on, they know what they're doing and can turn it off!).