Thunderbird Backup Tool is a full-fledged utility that saves your Thunderbird mailbox to different file formats PST, PDF, EML EMLX, MSG, CSV, MBOX, HTML, etc. Moreover, it also offers to migrate MBOX files or folders to several email clients like Gmail, Yahoo Mail, Hotmail, Office 365, IMAP, Zoho Mail, etc. They also preview your Thunderbird mailbox and items present in it before migration. Additionally, they are flawlessly compatible with all versions of the Windows operating system. You can download the free demo version to analyze the performance.