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If you want 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 method is a too lengthy process. So, additionally, they will also offer an advanced solution Thunderbird Backup Tool.  The software is a fully-fledged utility that saves your Thunderbird mailbox to different file formats such as PST, PDF, CSV, EML, EMLX, MSG, etc. Moreover, it also offers to convert MBOX files to several email clients like Gmail, Yahoo Mail, Hotmail, IMAP, Office 365, Zoho Mail, etc. You can split your sizeable resultant file into small parts through the split resulting PST file. Additionally, it supports all versions of the Windows operating system. You can download the free demo versions of the software to analyze the performance.