i didnt know IE has actually something to do with BugBear.. on all security sites they say it's only a risk for Outlook users...
I'm using The Bat! as email client, and Norton's AV with the newest defs, so i'm not really worried.. Nimda, Klez, ILOVEYOU and all that other crap couldnt harm me, so who the @!#$ is BugBear?