How to import Thunderbird mail to office 365?
If you want to import Thunderbird mail to office 365 then simply import your Thunderbird data to office 365 file without harming any stored data of Thunderbird, then utilizing the most successful tool that known as sysinspire Thunderbird to Outlook Converter Tool, it can export single or multiple Thunderbird MBOX to PST file formats without any changes in its data( bcc, cc, from, date, and attachments). Users can also try its free trial in which users export the first 25 items of Thunderbird to office 365.
Read More:- https://www.sysinspire.com/mboxconverter/

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Jackson shek commented
When I imported from Thunderbird to Office 365, I had the same problem. There isn't a straight way to import Thunderbird emails into Office 365 by hand, which can be annoying. The Softaken Thunderbird Converter Suite worked really well for me after I tried a few others. You can export your Thunderbird mailboxes and then import them straight into Office 365. You won't lose any formatting or attachments when you do this. You don't need to know a lot about computers to use it because the layout is easy to understand. The tool does everything else for you. All you have to do is add your Thunderbird files, pick Office 365 as the result, and log in with your account. It worked well for me and saved a lot of time. I think you should try this tool if you want a reliable answer.
Read More - https://www.softaken.com/thunderbird-suite
https://www.softaken.com/guide/import-emails-from-thunderbird-to-office-365/ -
Jacksonallen commented
To import Thunderbird to Office 365 then I would recommended you to use the Advik Thunderbird Converter. The software can directly migrate Thunderbird Mail to Office 365 in just a few simple clicks. It features advanced filtering options for selective migration and supports a wide range of output formats, making it a versatile choice for email conversion. You can download its free demo version which allows you to transfer 25 emails from each folder.
Read More: https://www.adviksoft.com/blog/how-to-export-emails-from-thunderbird-to-office-365-account
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Ashika Sharma commented
MacSonik Thunderbird backup tool is a reliable software that converts Thunderbird emails to Office 365. It allows to create backup and restore Thunderbird emails in bulk without any data alteration. It keeps the folder hierarchy throughout the conversion process. The Thunderbird backup tool for Mac also offers to import Thunderbird emails to different file formats and email clients.
Follow the below steps to import Thunderbird to Office 365 -
1. Install and run the Thunderbird backup tool for Mac.
2. Check the Thunderbird Mailboxes folder.
3. Choose the Office 365 option from the drop-down box.
4. Click convert to start the conversion process. -
Joy Hopson commented
I would like to recommend you to use eSoftTools MBOX Converter to MBOX to PST Converter. This is the fastest and accurate application to transfer email from MBOX to Outlook PST format. The software keeps original properties, inline images, email status, attachments, and header information until the end. You can use the software on various MBOX-based email clients and convert MBOX to PST, Office 365, EML MSG, HTML, Live Exchange, and others.
Read More:- https://www.esofttools.com/mbox-converter.html