Auto-completion in Outlook

http://blogs.gotdotnet.com/kclemson/PermaLink.aspx/b0a9684b-b813-4100-a47a-46786ae0808c

In Tools | Options | Email Options | Advanced E-Mail Options, there is a setting: "Suggest names while completing the To, Cc and Bcc fields." When enabled, Outlook suggests matches as you're typing in these fields, much like IE will suggest URLs as you're typing in the Address bar. Type in "David" and you will get a list of Davids to whom you have sent mail in the past (names are added to this cache on resolve, i.e. once they're underlined).

After a while, this list could get cluttered with people you rarely send mail to, so you don't need them in the cache. So you can delete those entries from the cache:

1. Type enough characters so that the name shows up in the list
   
2. Using the down arrow, select the entry you want to delete
   
3. Press the delete key

Buh-bye goes the name.

Note: The cache is stored on the client, so if you move to another computer with Outlook on it, you won't have the same list. For information on how to back-up this cache as well as the rest of your Outlook data, see http://support.microsoft.com/?id=287070. For information on how to configure the number of names that show up in the cache, see http://support.microsoft.com/?id=293032.