There is an issue with the latest version of Thundebird 102.7.0 authenticating with Microsoft 365 enterprise accounts. The update is not automatic and it is not recommended to manually update at this time. Please reference the below procedures if you manually update to revert back to version 102.6.1
Please reference this page for additional information and steps on how to revert back to version 102.6.1 if your client did update.
If you need assistance, please do not hesitate to submit a Support Request.
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