Thunderbird to Office 365
If you want to open Thunderbird mailbox in Office 365 account then you need a reliable tool. Because using manual method takes you a lot of time and it is not for everyone.
That's why we recommend MailsDaddy Thunderbird to Office 365 Migration Tool for single or multiple migrations. It is a simple yet useful solution that helps the user to convert the data without disturbing any data structure.
Read more: http://www.mailsdaddy.com/thunderbird-to-office-365-migration/

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Snart clent commented
To Import Thunderbird to Office 365 directly, you can use the BitVare MBOX Converter tool it let you convert Thunderbird MBOX file to Office 365 directly with attachments and emails attributes.
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amanda james commented
Utilise the best CubexSoft Thunderbird to Office 365 Converter to export Thunderbird emails, contacts, calendars, address books, and attachments to Office 365 interface. The software is workable on all the Windows and Mac operating systems. The interface of Thunderbird to Outlook 365 Converter is users friendly and non-complex. Download the trial edition of Thunderbird to Office 365 Converter to move upto 25 Thunderbird files to Office 365 free of cost.
Visit Here>> https://www.cubexsoft.com/blog/connect-thunderbird-office-365-webmail/ -
Joy Hopson commented
The eSoftTools Thunderbird to Outlook Converter Tool is an excellent tool for migrating Thunderbird files to the Office 365 email client. It has several different features that make the migrating process go efficiently. It also operates with all Microsoft Outlook versions, including 2007, 2010, 2013, 2016, and 2019. This program works with every version of the Windows operating system.
Read More:- https://www.esofttools.com/blog/how-to-import-thunderbird-mail-into-office-365/
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ANKIT ROY commented
As a user, I prefer an advanced and risk-free Mac Thunderbird Backup Tool to easily migrate Thunderbird emails to Office 365 on Mac. It allows performing bulk email conversion without loosing the folder hierarchy and data integrity. Using a professional Thunderbird Backup Tool for Mac, it becomes quick and safe to import all Thunderbird emails to Office 365 on Mac including all the mailbox components. Moreover, users can also backup & migrate Thunderbird to multiple file formats and email clients and delete duplicate emails from backup.
To know more:- https://www.macsonik.com/thunderbird-backup/
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Prabha Kapil commented
If you need to know ways to migrate Thunderbird Email into Office 365, Then try Thunderbird Converter Tool. It helps to migrate thunderbird mail to office 365 and other email clients like Outlook, Yahoo Mail, Gmail, etc. It also converts Thunderbird mailbox data into PST, PDF, Gmail, AOL, EML, and many other formats. It supports most of the versions of Windows and Mac and maintains folder hierarchy during conversion. To know more: https://www.convertertools.org/thunderbird-converter/
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Joy Hopson commented
If you are confused about which software is best for thunderbird to Office365 account, so don’t take tension because today I suggest you best tool that solves any difficulty related to conversion Apple Mail to a Gmail account file without wasting too much time, that name is the eSoftTools Thunderbird to Outlook Converter software, it easily converts single as well as multiple MBOX files in PST or - MSG, EML, EMLX, YAHOO, OFFICE 365, PST, GMAIL and HTML file formats.
Read More:- https://www.esofttools.com/blog/how-to-import-thunderbird-mail-into-office-365/