Import .nk2 files into Outlook 2010

When start Microsoft Outlook 2010 or configure Microsoft Outlook 2010 for the first time, the users nickname cache (stored in the profilename.nk2 file) is imported into a hidden message in your default message store. After the nickname cache is imported, the profilename.nk2 file is renamed to profilename.nk2.old. On the next start of Outlook, your nickname cache is not imported. Outlook 2010 does not use the .nk2 file for maintaining your nickname cache. All updates to your nickname cache in Outlook 2010 are made to the hidden message in your default message store.

However, there may be situations where one has to import a nickname cache file after this first-run nickname cache import process has finished.  Import the .nk2 files into Outlook 2010, some easy steps are: 

Step1: Make sure that the .nk2 file is in the following folder: %appdata%\Microsoft\Outlook

(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:

·         Click Start, and then click Control Panel.

·         Double-click Mail.

·         In the Mail Setup dialog box, click Show Profiles. )

Step2: Click Start and then click Run.

Step3: In the Open box, type outlook.exe /importnk2, and then click OK. This should import the .nk2 file into the Outlook 2010 profile. 

Step4: 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.

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See also:How to Import Excel into Outlook 2007