You can effectively remove duplicate MSG files from your folders. Then you can use a perfect tool like the
SameTools MSG Duplicate Remover tool. It scans all selected folders, such as subject, sender, and date, and removes only exact duplicates while keeping the original files intact. This tool helps improve mailbox organization and system performance. The tool is lightweight, easy to operate, compatible with all Windows OS versions, including 11, 10, 8.1, 8, and 7, without requiring the installation of MS Outlook. Even beginners can use it easily, and a free trial is available to check its accuracy before buying.
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https://www.sametools.com/duplicate/msg/