To Convert / Export Apple Mail / Mac Mail to Mozilla Thunderbird, Try Mail Extractor Max. It convert Apple Mail Mailbox to Microsoft Entourage / Outlook:mac 2011, Thunderbird / Postbox Emails, MBOX & EML file format.
http://bit.ly/29839vk
Migrate emails from Mac Mail to Mozilla Thunderbird
To Convert / Export Apple Mail / Mac Mail to Mozilla Thunderbird, Try Mail Extractor Max. It convert Apple Mail Mailbox to Microsoft Entourage / Outlook:mac 2011, Thunderbird / Postbox Emails, MBOX & EML file format.
http://bit.ly/29839vk