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If you are searching to convert Thunderbird Emails to Outlook then you will go with this informative article Export Thunderbird Emails To Outlook. Here you will get the most efficient and effective manual method to migrate the process. 

However, the manual method is a high chance of risk. So, in that case, you can choose a professional solution Mozilla Thunderbird Backup Tool. It is the most secure and powerful tool that saves your Thunderbird mailbox to PST, PDF, EML, EMLX, MSG, CSV, TIFF, JPG, GIF, etc. It allows you to preview your Thunderbird mailbox and its items before migration. An additional feature to remove duplicate emails protects your mailbox and saves your space from backing up the identical email. You can try the full-featured trial version of the software to analyze the performance.