Are you searching for How to import Thunderbird email to Office 365 file? Then, here I am recommending you, try eSoftTools MBOX to PST Converter Tool to move data from MBOX mailbox to PST Office 365, EML, EMLX, MSG, and HTML, etc file formats.it can support all versions of MS Outlook-like 2019, 2016, 2013, 2010, 2007, 2003, etc. You can also download its free demo version first, the trial editions convert 25 items from each folder.
Read More:- MBOX to PST Converter
Read More:- MBOX to PST Converter