If you want to delete individual entries from the autocomplete cache, start
typing in a name and when the list comes up, point to the entry you want to
delete (so that it's highlighted) and press Delete. To delete the whole
cache and start over, look for a file with an .NK2 extension and rename it
or move it. Outlook will start a new cache file the next time an e-mail
address is typed into the To: box. Note that if you're using Windows 2000
or XP, you'll need to search in hidden and system folders to find the .NK2
file (it also helps to have file extensions visible).

Signature
Jocelyn Fiorello
MVP - Outlook
*** Messages sent to my e-mail address will NOT be answered -- please
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> I updated my aunt's email address and Outlook keeps using
> her old address when sending her stuff. I verified I only
[quoted text clipped - 6 lines]
>
> Casey