Still trying things…I’ve discovered a setting in Entourage which I thought might help others who are using or trying it in IMAP mode…
For some reason certain IMAP servers (like mine) do not like to have commands sent simultaneously and with this on, you’ll notice quite a few connection errors as I previously noted.
To deactivate this default preference… Go to Tools / Accounts and select your IMAP account(s). Then go to Options and uncheck the “Send Commands Simultaneously” box.
I discovered this through a google search which led me to a page at Purdue University.