Mozilla Thunderbird - Wikipedia
10. To add Office 365 emails to Thunderbird, Open Thunderbird account and click on Menu Icon>> ImportExportTools>> Import Messages. or Simply Drag the files to Import into Thunderbird. Final Thoughts. In this post, we have discussed a manual way of adding Office 365 account to Mozilla Thunderbird. Thunderbird 68.0 is out: major email client update Aug 28, 2019 Backup Mozilla Thunderbird Emails to Hard Drive
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Add-ons for Firefox (en-US) Download Firefox extensions and themes. They’re like apps for your browser. They can block annoying ads, protect passwords, change browser appearance, and more. Thunderbird — Download Thunderbird — Thunderbird