How To Clear The Outlook Name Cache

Outlook maintains a "nickname" list that is used by both the automatic name checking and the AutoCompletion features. The nickname list is automatically compiled as you address email messages. If the nickname cache becomes corrupt, Outlook may not be able to identify recipients, may offer incorrect recipients, may send to an incorrect or old email address, or may send the message to the wrong person.

Remove An Outlook Name Cache Entry
1. Open Outlook
2. Open a new message window; go to the File menu and choose New - Mail Message.
3. Type one or more letters of the recipient name or address; this will show memorized (cached) entries in a drop-down list. Use the arrow keys on your keyboard to select the entry to be deleted. With the entry highlighted, press the DEL or DELETE key or your keyboard.

This removes the entry from your autocompletion cache.