If you want to transfer Thunderbird data files to Outlook PST format then you can try MailsDaddy Thunderbird to Outlook converter tool. This GUI application software keeps email formatting, inline images, attachments, and various other mail formattings in a new PST file. The software also helps to import multiple mailboxes from Thunderbird Maildir file to Outlook PST format.

Read more: https://www.mailsdaddy.com/blogs/mozilla-thunderbird-pst-converter-export-thunderbird-emails/