Many a times  you might have seen duplicate entries of Email Accounts or folders inside your Outlook Tree List. Though why this happens is not sure but there is a free tool, PST Ghost buster, which can fix it by removing the duplicate entries without any loss of your data.( Email, Calendar, Tod task etc )

With PST Ghost Buster all you need is to :

• Run it
• Select the outlook profile which has duplicate pst file.
• Type in the name of the Ghost File.
• Use Backup.
• Click on Check, if you get confirmation message click Repair.
• You are done.

Remove Duplicate PST files from Outlook

This tool is free and you can download it from here.

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