If you want to convert your Thunderbird to a new computer then you will go with the informative article Transfer Thunderbird to New Computer. This article will provide an effective manual solution to migrate the process. However, the manual solution is soo complicated. Therefore, they will also introduce an advanced solution Thunderbird Backup Tool. The software 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, it supports all versions of the Windows operating system. To analyze the performance you can download it.