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MailsDaddy Thunderbird to Office 365 Migration tool is the best GUI based application which allows user to migrate Thunderbird mailbox to Office 365 or Live Exchange mailbox. It is a completely tested utility as well as maintain the folder hierarchy in each migration. Users can install and run the tool on the Window-based operating system. Another best part of the tool is that the software allows users to import Thunderbird account email in Primary and Archive mailbox.
More info- https://www.mailsdaddy.com/thunderbird-to-office-365-migration/
MBOX To Office 365 Conversion
GainTools Cloud Importer Software is a countless high-quality to import all type data from MBOX file to Office 365. If you was searching any application from long time then I will recommend you to try this tool and import to your every data in very secure manner.
Help is on the way
Well I have been doing download tictactoe on my end and it honestly works fine. I think you might try resarting your PC.