Many Mac users face difficulties while exporting from Yahoo Mail to MBOX. This is the solution you can check out from here, MacSonik Yahoo Mail Backup Tool to export Yahoo Mail to MBOX Format, because this tool provides multiple functionalities. This tool provides the option to eliminate identical emails during the conversion. The utility provides the option to remove similar emails based on To, From, Subject, Bcc, and body. This feature helps users to store any mailbox item more than once.