Yes, there is an easy method to clean duplicate emails from MBOX files, I can suggest the best tool becouse I'm also using it. Try the TrustVare MBOX Duplicate Remover, which can quickly finds duplicate from MBOX files and clean them without losing original data. The software has a simple interface that allows non-technical users to use it without technical skills. The software is capatible with all Windows OS versions like 11, 10, 8.1, 8, and 7. There is no need to download any other application on the PC. You can try the free demo version before buying this tool.