I will plead ignorance. A serious question, why is that? What are the implications?
The way I have it set(?), I've never had a problem, and if there has been something nasty, my AV has always caught it.
Some nasties can execute just by allowing an email to open in the preview pane. Your AV *may* catch them.....or it may not. Not worth the chance IMO. -- 1/20/09 The Beginning of the End