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There are many other third-party tools available in the web market but only a few of them are reliable. I recommend using the MacSonik Thunderbird Backup Tool for Mac, you can easily backup and restore Thunderbird mailboxes to the local machine. Using this utility, you can export to Gmail, Yahoo, IMAP, Hotmail, AOL, Opera Mail, and HostGator Email. Its Date range feature allows users to select the start and end dates to export the emails between them. Moreover, the tool allows users to Thunderbird emails to PDF, PST, EML, EMLX, DOCM, DOCX, PNG, JPG, MSG, HTML, MHTML, GIF, etc. Additionally, it facilitates removing duplicate emails based on From, To, Cc, Bcc, Subject, and Body. This software has the advantage of migrating Thunderbird mailboxes to numerous email clients, for example, Gmail, Yahoo, IMAP, Hotmail, AOL, Opera Mail, Hostgator Email, and so on, in batches. Apart from this, the trial version of this tool is also available which helps to evaluate the performance of this software.