a How do I remove addresses from the Most Recently Used (AutoComplete) list?
Entourage X – 2008 : To clear ALL there is a preference in Mail & News: Compose: Clear List button. There is also an option in the preferences to disable this feature all together. Entourage 2001: There is no Clear List button. Both versions: To clear a single address, add it exactly like the one that is remembered to your address book and mark it as Junk (or assign category Junk). You can just delete the address, but if you receive it again it will just be added back. Marking as junk will permanently remove it from the AutoComplete list.