If you need to Import Thunderbird mail to Office 365, you can use the eSoftTools Thunderbird To Outlook Converter Software, which has amazing features that convert Thunderbird mailboxes to Office 365 efficiently and without losing any data. It works well with all editions of MS Outlook 2019, 2016, 2013, 2010, 2007, and 2003. This program can simply convert single or numerous MBOX files in Office 365 without affecting the email formatting, styles, header, and so on.
Read More:- Import Thunderbird mail to Office 365
Read More:- Import Thunderbird mail to Office 365