Vulnerabilities occur on both systems... but so far only PCs have in-the-wild exploits of those vulnerabilities.
Yah. Ok.
I actually don't have a dog in this fight. I'm a big fan and user of Windows, Mac, Linux, Unix and a little VMS. They've all got their good and bad points and they've each got their place in the enterprise.
But what cracks me up are the mac users that continue to live in a totally pants-down dreamland of invulnerability. The inevitability of the eventual reality check will be difficult not to pounce on with much mirth and celebration.
But I was a machead first. So it is with sadness, too.
:-)