The simplest way to remove duplicates from an MBOX file is with SameTools MBOX Duplicate Remover. The utility scans MBOX files to find duplicate entries and then deletes them, while leaving the original unaffected. It removes large-sized duplicate MBOX files without needing another download or installation of any tool using the software. The interface is very easy to use and does not require any technical knowledge to operate this tool. Compatible with all versions of Windows like 11, 10, 8.1, 8, and 7. This tool provides free trials, so before buying the software, you can make use of the trial period at least once.