Microsoft OAuth Authentication and Thunderbird in 2024

Microsoft has made some changes to authentication for their hosted email services for business and academic accounts. This article describes these changes and how to adjust to them.

Microsoft have also changed the way they classify certain clients, and Thunderbird’s previous OAuth setup does not properly qualify as a desktop client. As a result, we have been forced to make configuration changes to Thunderbird, which may have side effects for users.

For outlook.com, hotmail.com, Microsoft 365 (formerly known as Office 365 and often abbreviated as “O365”) or other Microsoft-hosted email services, you may see the following issues:

Leave a Comment