It is possible to delete duplicate MSG files without downloading any software. Then it's use SameTools Remove MSG Duplicate tool. The tool will find duplicate MSG files quickly and removes them without compromising your vital data, and also saving your time, efforts, and storage. This tool is best for non-technical users without any technical skills. It can handle large duplicate MSG files without downloading any software. All Windows OS versions including 11, 10, 8.1, 8 and 7 are supported. You can use a free demo before purchasing.
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https://www.sametools.com/duplicate/msg/