I have outdated addresses that appear in my To: field when I start typing.
Yes, but not easily done in 2001. Here's the scoop on the auto-fil
addresses:
The Most Recently Used (MRU) auto-fill list.
The "Most Recently Used" (MRU) is often misunderstood. These entries are
harmless. They never show up in your Address Book, only in the auto-fill
list. Also, Entourage automatically selects the address you will most likely
want to send to based on the text you've already typed.
Any message marked as Junk (either by you or the Junk Mail Filter) will not
be added to the MRU list.
Entourage's Address AutoComplete feature gathers addresses from both the
address book and the recently-used list (with a maximum of 200 entries).
They are sorted intelligently, organized by the frequency of messaging for
each contact, with the most-used contacts showing up on top.
There will always be 200. Some will always be considered "useless" by the
user. The better organized you are at adding "good" addresses to you address
book the more you will enjoy the MRU feature.
Entourage X: To clear ALL there is a preference in Mail & 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
auto-fill list.