I have a relevant tool that helps you to migrate Thunderbird to Office 365 default and In-place archive mailbox. MailsDaddy Thunderbird to Office 365 migration tool is designed to load and import multiple mailboxes at once. User can use the software on different Windows OS and easily convert single or multiple Thunderbird data to Office 365 account at once. The demo edition of the software converts only 20 emails from each mailbox.
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