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Transferring Thunderbird Emails to file formats can be challenging, as Thunderbird uses the MBOX format. So I suggest the MacSonik Thunderbird Backup Tool through which you can transfer your Thunderbird email to multiple file formats as well as into multiple email clients. The tool also has many features like Manage Email Attachments in which you can choose to exclude attachments from the migration process or save them in a separate folder as PDF files. Furthermore, it ensures that the data remains intact, whether the migration process includes attachments or not.