You can reduce the size of a huge duplicate PST file in Outlook. Then you can try the
SameTools PST Duplicate Remover without any errors. The software automatically finds duplicates in the PST files and removes them. The software manages a huge number of duplicate PST files and it reduces PST file size without downloading any other software. It will support all Windows OS versions like 11, 10, 8.1, 8, and 7. It has an easy interface for non-technical users becouse they don't need any technical skills without technical skills to use this tool. The software provides a free demo version before purchasing it.
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https://www.sametools.com/duplicate/pst/