Users may have been unable to open the new Outlook desktop client app on Windows devices
ID: EX1137908
Issue type: Incident
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Impacted services
Exchange Online
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Details
Title: Users may have been unable to open the new Outlook desktop client app on Windows devices
User impact: Users may have been unable to open the new Outlook desktop client app on Windows devices.
More info: As a workaround, affected users could’ve used the Outlook classic desktop client.
Final status: We’ve successfully reverted the service to the last known healthy build to remediate the impact and confirmed from telemetry that this issue is no longer occurring.
Scope of impact: Approximately five percent of users attempting to open the new Outlook desktop client on Windows devices may have been impacted.
Start time: Monday, August 18, 2025, at 10:00 PM UTC
End time: Tuesday, August 19, 2025, at 5:17 PM UTC
Root cause: A recent deployment intended to optimize services dependent in the affected scenario caused crashes to occur on these services, leading to the impact.
Next steps:
- We’re reviewing our validation and updating procedures to better detect and prevent issues like this prior to deployment in the future.
This is the final update for the event.
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