Trust me: the best firewalls and virus checkers are no match for sheer stupidity inside a very large corporation. We did not get hit with this one, but it is amazing how, even after lots of warnings, threads, forced AV software upgrades and dat file pushes, some idiots will still click on any attachment that they see in email or on a web site. If it was only them that suffered, that would be one thing. But this has a way of spreading and causing DoS.