Using New Outlook on Windows for professional communication and productivity
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From the screenshot, it appears the issue is occurring in New Outlook for Windows, while the troubleshooting steps you listed are for Windows App. Could you please confirm whether the affected application is New Outlook for Windows?
If so, the issue is more likely related to the mailbox or licensing rather than the Windows App itself.
Based on the error message, I would recommend checking the following:
- Verify that the affected user has a valid Microsoft 365 license that includes Outlook desktop apps.
- Verify that the user's Exchange Online mailbox is provisioned correctly and can be accessed successfully through Outlook on the web (OWA).
- Verify whether there have been any recent changes to the user's Microsoft 365 license or mailbox configuration, since you mentioned the issue occurred unexpectedly.
Please note that we're not Microsoft Support; this is a user-to-user community forum. Moderators here don't have access to your environment or Microsoft's backend systems, so we can only provide guidance based on public documentation and community experience.
I look forward to your update.
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