The Auto-Complete feature suggests names as you type in the following boxes: To, Cc, Bcc boxes in an e-mail.
As you type the first letter(s) of a name, Auto-Complete suggests matches based on names previously used.
Note: Frequently used names remain on the list; infrequently used names are dropped from the list.
Make sure your settings are activated:
Open Outlook program
Click the two boxes
Click Empty Auto-Complete List if your auto-complete list is out of control.
July 05, 2012