As part of that announcement, the Redmond company also confirmed that the next Long-Term Servicing Channel (LTSC) version will be based on Windows 10 21H2 and will be released later this year.
In other words, third-party email apps that don’t support OAuth 2.0 will lose access to the Outlook email service, and Microsoft’s older Outlook apps that don’t have OAuth 2.0 will also lose access.
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