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Try the KDETools Outlook PST Merge to join multiple PST file into single PST files and also removes the duplicate items. It supports all the Windows Version and Outlook Version. This tool join PST files without installing MS-Outlook. It supports all the Windows Version and Outlook Version. It merges the PST files such contacts emails and all item which you are selected.

Visit Here: Outlook PST Merger - Combine & Join, Merge Multiple PST Files in One