Unfortunately, Outlook remembers the mistyped and old as well as the correct and current and suggest it indiscriminately. Fortunately, getting rid of entries you no longer want to appear in the auto-complete list is easy.
Delete an Address from the Outlook Auto-Complete List
To remove a name or email address from Outlook's auto-complete list:
- Create a new email message in Outlook.
- Start typing the name or address you want to remove.
- Use the down arrow key to highlight the desired (undesired) entry.
- Press Del.
Want to Edit the Outlook Auto-Complete List?
For more control over Outlook's email address auto-complete file, try a tool like Ingressor.
Prevent Outlook Address Auto-Completion Altogether
You can also stop Outlook from suggesting email addresses as you type:
- Select Tools | Options... from the menu.
- Go to the Preferences tab.
- Click E-mail Options....
- Now click Advanced E-mail Options....
- Make sure Suggest names while completing To, Cc, and Bcc fields is not checked.
- Click OK.
- Click OK again.
- Click OK once more.

