Outlook 2010/2013 NK2 import not saving

I copied the .nk2 file from my old computer. However, the nickname auto complete features did not work after I reopen the Outlook.

I just got this to work, by typing this command from the Start button >> search bar.

outlook.exe /CleanAutoCompleteCache

Then, I renamed the .NK2.old file back to .NK2, and reimported it by opening Outlook with this command:

outlook.exe /importnk2

This time the nickname cache stayed put.

Hope this helps...