Do you have large size PST file or want to reduce the size of the PST file? If yes, then I would suggest you go with PST Duplicate Remover. The tool will help you to remove all duplicate emails or items from the PST files without any changes or edit in the original data. You can remove duplication items from any version of Outlook PST files. I would also recommend you to try a trial version of this Outlook PST Duplicate Remover. With the help of the trial version, you can remove the first fifty items per PST file.
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https://www.bitdataconversion.com/pst-duplicate-remover.html