Yes, there are many safe ways to clean duplicate emails from PST files, then try the best becouse I'm using it. Try the SameTools PST Duplicate Remover which quickly finds duplicates in the PST files like emails, contacts, notes, tasks, calendar, etc, and cleans them without losing original data. It can clean duplicate PST files in bulk without downloading any other application. It will run on all Windows OS versions like 11, 10, 8.1, 8, and 7. The tool is best for non-technical users becouse it has a simple interface and users can use it. Users can use their free trial before buying this tool.
Visit here: https://www.sametools.com/duplicate/pst/