Yes I am sorta new to Macs. I've used Macs at school for a few years until recently I finally got a G5. So I'm pretty familiar with OS X, but I've owned one for about 2 1/2 weeks. I asked the guy at the Apple store if having a virus app was really necessary since Macs have almost 0 viruses. He said yea I should get a virus app because a Mac is still at risk (he compared it to PCs getting hit by a virus everday and a Mac once a month). So I just assume that Virex will update, just not nearly as much as Norton for the PC.