If you are searching to convert your Thunderbird to a new computer then you will go with this informative article Transfer Thunderbird to New Computer. This article will provide the most trusted manual solution to migrate the process. However, the manual answer is too technical. So, additionally, they will also offer a professional tool Thunderbird Backup Tool. The software is a full-fledged utility that saves your Thunderbird mailbox item to different file formats such as PST, PDF, EML, EMLX, MSG, CSV, TIFF, JPG, HTML, etc. Moreover, it also safely migrates MBOX files to several email clients like Gmail, Yahoo Mail, Hotmail, Office 365, IMAP, Zoho Mail, etc. You can split your large resultant PST file into small parts through the split resultant PST feature. Additionaly, it supports all versions of the Windows operating system. To analyze the performance you can download the demo version.