You can try a specialized application MacSonik Mac Thunderbird Backup Tool to backup and restore Thunderbird mailboxes to the local machine. You can quickly back up Mozilla Thunderbird emails to multiple file formats with this expert program while keeping the hierarchy. Additionally, you may Export Thunderbird emails to Gmail, Yahoo, IMAP, Hotmail, AOL, Opera Mail, and Hostgator Email. Apart from this, the trial version of this tool is also available which helps to evaluate the performance of this software.
