To remove duplicate emails from Mozilla Thunderbird easily, the best way is to use a professional tool like SysTools MBOX Duplicate Remover. It directly scans Thunderbird MBOX files and deletes duplicate emails based on filters like To, From, Subject, Date, and Body. You can remove duplicates in bulk without any data loss, and it also keeps your folder structure intact. This is much faster and more accurate compared to manual methods or add-ons.
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