Yes, when you have many PST files with the same contacts, manually way to determine which ones are safe to delete can be risky and time-consuming. You might accidentally remove important contacts or lose associated emails. So, try the best tool like TrustVare Outlook Duplicate Remover which can find multiple duplicate items in the Outlook files and remove them wihtout losing original data or files. This tool automatically scans your PST files to identify duplicate contacts, calendar, notes, tasks, events, etc, and allows you to preview duplicates before deletion. The tool ensures that original contacts and emails will be safe. The tool capatible with all Windows OS editions like 11, 10, 8.1, 8, 7, and also supports Outlook versions. You can try the free demo version before buying this tool.