To import .nk2 files into Outlook 2013 or Outlook 2016, follow these steps:

1. Make sure that the .nk2 file is in the following folder:
   %appdata%\Microsoft\Outlook

   Note The .nk2 file must have the same name as your current Outlook 2013 or Outlook 2016 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 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 2013 or Outlook 2016. Therefore, if you try to re-import the .nk2 file, remove the .old file name extension.