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January 23rd, 2014

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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. Please be aware that this may remove some or all of your suggested contacts. I would recommend that if there are contacts in the autocorrect list that you wish to save please save the email addresses to your contacts.

You may need to:

Saving a “nickname” to Contacts

  1. Open Outlook.
    1. Outlook 2010/2013: On the Home page, click New Email.
  2. Type one or more letters of the recipient name or address; this will show memorized (cached) entries in a drop-down list
  3. Click on the email address, like you are sending an email
  4. Right click on the email address and from the dropdown menu click on Add to Outlook Contacts
  5. Add extra details, if required and Save the email address.

To delete a single cached entry:

In Outlook:

  1. Open Outlook.
    1. Outlook 2010/2013: On the Home page, click New Email.
    2. Outlook 2002/2003/2007: Click New > Mail Message.
  2. Type one or more letters of the recipient name or address; this will show memorized (cached) entries in a drop-down list.
  3. Use the arrow keys on your keyboard to select the entry to be deleted. With the entry highlighted, press the DELETE key on your keyboard.
    This removes the entry from your autocompletion cache.


In OWA:

  1. Click New (or New > Message)
  2. Type one or more letters of the recipient name or address; this will show memorized (cached) entries in a drop-down list.
  3. Use the arrow keys on your keyboard to select the entry to be deleted. With the entry highlighted, press the DELETE key on your keyboard.


To delete a cached entry from Suggested Contacts in Outlook 2010/2013:

Note: In a clean Outlook 2013 installation, Suggested Contacts folder is no longer available, the folder never is created, and no suggested contact items are created. In an upgrade to Outlook 2013, this folder is visible, and participates in linking, aggregation and search. However, no new suggested contact items are added to the folder. The folder displays in an upgrade scenario, but can be deleted.

  1. Switch to Contacts in the Navigation Pane.
  2. Open the Suggested Contacts folder.
  3. Find the entry you would like to delete.
  4. Right-click the contact and choose Delete.
    Note:
    You may use CTRL+A to select all suggested contacts as well as CTRL and SHIFT keys to select several contacts.

To delete all cached entries:

In Outlook 2010/2013:

  1. Navigate to File > Options > Mail.
  2. Scroll down to Send Messages and click Empty Auto-Complete list:

  • Alternatively, you can delete all cached entries using Outlook command-line switch. Close Outlook, go to Start > Run > type outlook.exe /cleanautocompletecache and hit Enter. On Outlook startup, choose your Exchange profile. It will be loaded without cached entries.

In Outlook 2002/2003/2007:

Outlook 2002/2003 and 2007 store this cache in a local, profile-specific file with the extension .nk2. To reset the Outlook nickname cache, use the following steps that are appropriate for your version of Microsoft Windows. After you restart Outlook, Outlook generates a new nickname cache.