There is a solution to remove duplicate PST files and not take the chance that you can import something important. I can recommend a perfect software package to try out, SameTools Remove Outlook PST Duplicate. It simply sits in the background and finds duplicate PST files and removes them, and you will not lose any data. This application can handle an extreme number of duplicate PST files and never fails. This application works flawlessly on all Windows OS versions, including support for ANSI and UNICODE, and does not require additional applications to be installed. You can always download their free demo before purchasing this application.