Download latest https://www.thunderbird.net/en-US/
In Thunderbird select Account Settings Tab
Add Mail Account
Enter your name as you want it to appear
Enter your email address in username format
DO NOT enter password at this time
Continue
Enter Incoming Server Hostname: outlook.office365.com
Enter Outgoing Server Hostname: outlook.office365.com
Re-Test
After re-test
Ports should autofill
Press Done
Enter Password
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This is question number 2958, which appears in the following categories: