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You can remove large numbers of duplicate PST emails from your system. Then you can try this TrustVare Outlook Duplicate Removal, which quickly scans duplicate PST emails and deletes them without affecting your original data. This software can handle a large number of duplicate PST files without any issues, and it doesn’t require the installation of any other application. This software range supports all Windows OS versions, including 11, 10, 8.1, 8, and 7, and also runs with ANSI and Unicode. You can use their free demo.