Seems to me that you should be using autoresolution instead of
autocompletion. Outlook has both features. The former sounds like what you
want.
http://home.indy.rr.com/russval/autocompletion.htm

Signature
Russ Valentine
[MVP-Outlook]
> Is there anyway to limit the autocomplete feature in Outlook 2002 to only
> those in ones actual contact list? Our office has had issues with the fact
> that Outlook tends to remember and include any and every address someone
> has
> used in the past and will autocomplete or suggest these unnecessary
> contacts.