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If you have recently upgraded to outlook 2010 then you will surely experience some unknown issues with it. Generally your nickname cache .nk2 will automatically imported in exchange mailbox into a hidden message. If you are using Windows XP OS then it will automatically stored at:
Drive:\Documents and Settings\Username\Application Data\Microsoft\Outlook
The location of .nk2 file in windows Vista and later version will be:
Drive:\Users\Username\AppData\Roaming\Microsoft\Outlook
However, sometimes .nk2 file doesn't automatically stored at the predefined locations and in that situation you need to import .nk2 file into outlook 2010. .nk2 file is very important and if it is not imported into outlook 2010 then all new messages will stored into hidden message in default message store. If you want to store all messages at .nk2 file then perform the task mentioned below to import .nk2 files.
Ensure that .nk2 file is loacted at below mentioned location:
%appdata%\Microsoft\Outlook
It is important to verify that name of .nk2 file and outlook 2010 profile is same. Outlook 2010 takes outlook as default profile name. You can check the name by: start>control panel> double click on mail> show profile>in mail setup dialogue box>. It will show the outlook profile name.
Then go to start followed by run and type outlook.exe /importnk2. Click OK to import .nk2 file into outlook 2010.
After following above mentioned steps .nk2 file will imported to outlook 2010. Here, it is important to know that after importing .nk2 file, the contents of this file will merged into the cache that is already existing and currently available at mailbox.
Follow these steps to import .nk2 file into outlook 2010. If you experience any kind of data loss situation during or after following these steps from outlook account then use professional PST repair tool to get back lost data.

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