Certainly no known OS in invulnerable to viral problems. I do appreciate that there's no registry aka Windows to mess with as that's 90% of the problem. Their proactive way of dealing with it by plugging the holes rather then scanning for the viruses makes more sense. I love windows 7 and use Linux for banking when I need a more secure environment. As long as it is updated (it really needs a better autoupdater), it is secure.