If you want to move your Thunderbird to a new computer then here is the most informative article for yours Move Thunderbird to New Computer. This article will provide the most secure manual solutions to migrate the process. However, the manual solution is soo complicated. So, additionally, they will also introduce an advanced solution Thunderbird Backup Tool.  It is the most efficient and effective software solution for Thunderbird mailbox backup! With this tool, you can save your Thunderbird mailbox to multiple file formats, including PST, PDF, CSV, EML, EMLX, JPG, HTML, DOC, etc.  Moreover, it also facilitates the seamless migration of MBOX files or folders to various email clients such as Gmail, Yahoo Mail, Hotmail, Office 365, IMAP, etc. The software allows you to back up Thunderbird Mail with or without attachments to your preferred location on the machine, providing flexibility and convenience. To assess its performance and features, you can try the trial version of the software.