There are many ways to automatically clean duplicate emails from MBOX files without affecting the mailbox structure or attachments. Then use a perfect tool like SameTools MBOX Duplicate Remover. This software scans MBOX files, identifies duplicates based on emails, attachments, and removes them without affecting the original emails. It supports large MBOX files, preserves folder structure and attachments, and ensures data integrity. The tool is compatible with all major Windows versions, like 11, 10, 8.1, 8, and 7. It has a simple, user-friendly interface for non-technical users, and they don't need any technical skills to operate it. A free demo version is available to test the process before purchasing.

Visit here: http://www.sametools.com/duplicate/mbox/