Yes, you can clean duplicates from a large PST file without slowingdown Outlook, then you can use the best tool or method for it, becouse manual way is too time-consuming. Try the
SameTools PST Duplicate Remover, which can quickly scan Outlook files like emails, contacts, notes, tasks, calendar, etc, finds duplicate items and remove them without harming original data, slowdown Outlook performance. It will support all Windows OS versins like 11, 10, 8,1 8, and 7. There is no need to download any other application. It has users-friendly interface that sis uitable with all non-technical users and you can use their free demo versions.
Visit here:
https://www.sametools.com/duplicate/pst/
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