FMGC/PD
I'm not an Entourage user (Mail works fine for all my POP3 and IMAP), but there is a quite healthy discussion group about all things Entourage here:
http://groups.google.com/group/micro...fice.entourage
I quickly skimmed through it, and it appears that you are not alone. It looks as if it might have something to do with the last update.
Hope this helps,
Applemacster