Office 2010 and Nicknames (.NK2)

Office 2010 no longer uses the .NK2 file to store nicknames. This is the list of names that drops down when you begin to type an email address in the TO: box. Instead, the list is stored internally as a hidden file in the inbox and is not easily accessible.
If you need to restore the .NK2 file from an old PC, use some tools to recover the email addresses. One tool that I have used is NK2view from
Copy the list into the clipboard, open a new message, and paste the lot into the TO: field. (DON’T SEND THE EMAIL! Smile). Cancel the email, and all the address will have been imported.
UPDATE: Microsoft now have a fix for this here –
To import .nk2 files into Outlook 2010, follow these steps:
  1. Make sure that the .nk2 file is in the following folder:

    Note The .nk2 file must have the same name as your current Outlook 2010 profile. By default, the profile name is “Outlook.” To check the profile name, follow these steps:

    1. Click Start, and then click Control Panel.
    2. Double-click Mail.
    3. In the Mail Setup dialog box, click Show Profiles.
  2. Click Start, and then click Run.
  3. In the Open box, type outlook.exe /importnk2, and then click OK. This should import the .nk2 file into the Outlook 2010 profile.Note After you import the .nk2 file, the contents of the file are merged into the existing nickname cache that is currently stored in your mailbox.

Note The .nk2 file is renamed with a .old file name extension on the first start of Outlook 2010. Therefore, if you try to re-import the .nk2 file, remove the .old file name extension.

Leave a Reply

Your email address will not be published. Required fields are marked *

Solve the Equation to continue * Time limit is exhausted. Please reload CAPTCHA.