Can't upload Mozilla Thunderbird mailbox directly to Office 365 account, even the manual method is not used by anyone. Here the user needs an automated tool that can do the Thunderbird to Office 365 conversion easily.
Many users know that MailsDaddy Thunderbird to Office 365 Migration is a feature-rich solution that allows users to migrate single or multiple Thunderbird to Office 365 mailboxes.
The software helps users to import Thunderbird emails into default and in-place archive mailboxes. If you never use software that doesn't you can also use the solution and export Thunderbird to Office 365.
This Thunderbird to Office 365 conversion tool comes with a free demo version to easily migrate data from Thunderbird to Office 365.