Hi Dan,
We've seen several conditions that can cause Entourage to exhibit the
behaviour you describe (often referred to by our users as "the hiccup").
a) Antivirus software scanning the mail database file; Symantec AV is
particularly bad. Make sure that any AV autoscan feature excludes the
~/Documents/Microsoft User Data/Office 2004 Identities/ folder. You might
also exclude that folder from Spotlight access as well (it's not necessary
to scan it to use Entourage's Spotlight integration).
About 80-90% of our Entourage performance calls are linked to SAV. :-(
b) A very large message that continually tries & fails to synchronize with
the Exchange server. One of our users had a 124 MB (!) enclosure in one
message, so Entourage kept trying to download it, timed out, and tried
again. You can sort your mailbox by size, or create a custom view that
includes large messages from all folders. It may also be helpful to log into
the account with an Outlook client to see if the performance lag is there as
well, or if a large message that doesn't sync to Entourage shows up there.
c) Any process that periodically scans the hard drive (QuickSilver, A Better
Finder Launcher, KeyAccess etc.) could conceivably cause this problem if it
ran completely amuck. Check Activity Monitor to see if there's a specific
process that kicks up every time the stall occurs.
d) General Exchange mailbox corruption. If you do have F.W.O. (friends with
outlook) and can archive your mail in a .pst file, do it & ask your Exchange
administrator to delete and recreate your account, then import the .pst back
into your Exchange folders. This is a fairly blunt instrument and a pain in
the neck, but sometimes does help.
e) Way out in left field: a corrupt font. Try creating a new user on your
Mac and setting up Entourage & your Exchange account in the new user space.
If there's a font (or other preference/library setting) that is unique to
your OS X user and causing a problem, the stall should go away; that would
give you another avenue for troubleshooting.
Good luck,
--Mike