How to remove old nickname cache entries in outlook, one at a time

Outlook 2010 and later versions

To reset the whole Outlook nickname cache for Outlook 2010 and later versions, use one of the following methods: 

Method 1
  1. Open Outlook.
  2. On the File tab, click Options.
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  3. Click the Mail tab.
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  4. Under Send Messages, click Empty Auto-Complete List.
  5. Click Yes.

Outlook will generate a new nickname cache.


Method 2
  1. Click Start, and then click Run.
  2. Start Outlook by using the /CleanAutoCompleteCache switch. To do this, type Outlook.exe /CleanAutoCompleteCache

    Note If Outlook is not installed in the default location, you must point to the path of Outlook.exe.

Outlook will generate a new nickname cache.

Outlook 2002 through Outlook 2007

Windows 7 or Windows Vista
To reset the whole Outlook nickname cache, follow these steps:
  1. Exit Outlook.
  2. Click Start, and then click Computer.
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  3. Click Organize, and then click Folder and search options.
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  4. On the View tab, click Show hidden files, folders, and drives.
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  5. Click OK.
  6. Click Start, click All Programs, click Accessories, and then click Run.
  7. In the Run dialog box, type the following command (including the quotation marks), and then click OK:

    “C:\ Users\UserName\AppData\Roaming\Microsoft\Outlook”


    NoteUsername in this path is the name of the currently logged on Windows user.
  8. Right-click the .NK2 file that has name of the profile that you want to reset, and then click Rename.
  9. Rename the file as profilename.bak, and then press Enter.
  10. Start Outlook.
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