You can remove duplicate attachments from Outlook while keeping the original email messages intact by using a dedicated utility like SysInfo Outlook Duplicate Remover. The tool scans Outlook PST files, identifies duplicate attachments, and removes only the repeated files without deleting the actual email content. It also provides an option to save attachments separately, so the mailbox remains organized while reducing PST file size. More: https://www.sysinfotools.com/recovery/outlook-duplicate-remover.php