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KDETools PST Merge is one the best and easy to merge the multiple PST files into single files without MS-Outlook installation and merge without duplicate items.

More Info: https://www.kdetools.com/pst-merge.html

 

If you have multiple Outlook PST files and choose to merge them into a single file, you can do so with the help of third-party software. It is a safe and stable method of combine PST files. Merge PST Tool merges all Outlook PST files into a single file securely and without losing any data. For a limited time, you can download a free demo version of this software. It works in both ANSI and UNICODE PST files.