To clean up your Outlook mailbox and remove duplicates from multiple PST files, try the SysInfo Outlook Duplicate Remover Tool. It identifies duplicate items in emails, contacts, calendars, tasks, and journals, then removes them instantly. You can customize the process by choosing which folders to scan, setting a date range, and selecting how duplicates should be handled. https://www.sysinfotools.com/recovery/outlook-duplicate-remover.php