The duplicates in the PST file cause file damage and even data corruption as duplicates take up a lot of space inside a PST file. PST files can only accommodate so much data and if the size of the PST file exceeds its 50 GB limit, PSTs tend to operate slowly. To deal with this issue Shoviv Software has created a very useful software application. Outlook duplicate remover is a utility that helps outlook users to remove duplicate items from a PST file. It deletes duplicates from emails, notes, calendars, contacts, etc. This tool hardly takes any time to get rid of these redundant items in a PST file. It is supported in all versions of Windows OS and MS Outlook.

There is a blog post online that covers this tool in-depth, have a look:-