If you are worried about How to import Thunderbird mail into OFFICE 365? Then do not take tension. Because today I suggest you the best Third-Party Tool that easily converts Thunderbird to OFFICE 365, that name is eSoftTools Thunderbird to Outlook Converter. It can convert Thunderbird to PST, MSG, EML, EMLX, NSF, HTML, OFFICE 365, GMAIL, and YAHOO. It can also convert Bulk thunderbird files to others file formats. It comes with the free trial pack which users can convert the first 25 items from Thunderbird to PST or others formats.