How to reset the nickname and the automatic completion caches in Outlook

Applies to: Microsoft Office Outlook 2007Microsoft Office Outlook 2003Outlook 2013 More


Microsoft Outlook maintains a nickname list that is used by both the automatic name checking feature and the automatic completion feature. The nickname list is generated automatically as you use Outlook. If the nickname cache is corrupted, Outlook may be unable to identify recipients, may offer incorrect recipients when automatically completing the email address, or may send the message to the wrong person.

Unlike earlier versions of Outlook that store the nickname cache in a file on your computer, Outlook 2010 and later versions store the nickname cache in your primary message store. For example, if you are using a Microsoft Exchange Server account, your nickname cache is stored in a hidden message in your mailbox. 

How to remove nickname cache entries, one at a time

How to clear the whole nickname cache

To have us clear the whole nickname cache for you, go to the "Here's an easy fix" section. If you prefer to fix this problem yourself, go to the "Let me fix it myself" section.

Here's an easy fix:

To fix this problem automatically, click the Download button. In the File Download dialog box, click Run or Open , and then follow the steps in the easy fix wizard.
  • This wizard may be in English only. However, the automatic fix also works for other language versions of Windows.
  • If you're not on the computer that has the problem, save the easy fix solution to a flash drive or a CD, and then run it on the computer that has the problem.
For Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows Server 2012 R2 or Windows Server 2008 R2

For Windows Vista, Windows Server 2008 or Windows Server 2003

Did this fix the problem?

Check whether the problem is fixed. If the problem is fixed, you are finished with this section. If the problem is not fixed, you can contact support.