Mac OS X, mythically immune to common computer plagues, has actually always welcomed antivirus software. Or, uh, maybe not. Confused? No worries-here's how OS X and Windows differ on resisting viruses and other nasties.
It's not a matter of opinion: OS X is less susceptible to catching a cold than Windows. So is Linux, for that matter. There are two major reasons (and Steve Jobs' pee actually isn't one of them). First, Windows is on 89.6 percent of the world's personal computers, while OS X is on just 8.9 percent of them. Second, the Unix architecture that OS X and Linux are based on is inherently more secure than Windows, particularly pre-Vista versions. (If these reasons are familiar to you, you may not know the subtler side-effects of each reason that strengthen the case even more, so read on.)