MailsDaddy Thunderbird to Office 365 Migration Tool
For conversion point of view Thunderbird data cannot be exported directly to Office 365 so we use MailsDaddy thunderbird to office 365 migration tool. This simple solution provides a simple way to take a Thunderbird mailbox to the office and keep all the components intact. The software also has the option of converting data selectively and in bulk along with many simple features.
Users can install it on any Windows machine and convert data from Thunderbird to Office 365, PST, and Live Exchange. Users can also access the free version to be aware of the conversion steps of the solution.
For more detail: https://www.mailsdaddy.com/thunderbird-to-office-365-migration/