When Outlook folders get duplicated after importing a PST file, it usually happens because the file was imported instead of opened, causing Outlook to recreate the same folder structure. Re-importing the PST won't fix the issue--it will only create more duplicates. Unfortunately, Outlook does not have a built-in option to delete duplicate folders in bulk. A reliable solution is to use the TrustVare Outlook Duplicate Removal Tool. This software is specially designed to remove duplicate emails, contacts, calendars, and folders from Outlook PST and OST files without affecting your original data. It works with all Outlook versions and supports both ANSI and UNICODE PST files, and also supports all Windows OS versions like 11, 10, 8.1, 8, and 7. The tool allows you to preview duplicates before deleting them, ensuring full safety. Before using the tool, make sure to back up your PST file, then let the tool scan and remove all duplicates Outlook PST automatically. It's much faster and safer than manual cleanup, giving you a clean and organized Outlook mailbox.