Get complete duplicate deletion utility â€“ Outlook Duplicate Remover to know how to delete duplicate folders in Outlook. The software is easy to install on all Windows Operating Systems i.e. Win 11, 10, 8.1, 8, 7, XP, etc. With help of the PST File Duplicate Remover, you can delete bulk duplicate files from Outlook PST at once without any error. For using the software, Outlook installation is not compulsory to achieve the duplicate deletion task. You can try free Outlook Duplicate Remover download edition to test the softwareâ€™s working functionality while deleting 25 items.