Microsoft 365 Alert – Service Degradation – Exchange Online – Some users’ saved Outlook calendar views may not be preserved – RESOLVED

Announcements Arpan Das

21/03/2025 08:32:00 AM

NHSmail Reference: INC46509054

Microsoft Reference: EX1057770

Issue Status: RESOLVED

Issue Description: Users’ saved Outlook calendar views may not be preserved.

More info: This issue may impact users who are leveraging Outlook on the web, the new Outlook desktop client experience, or those who have the new Calendar enabled in Microsoft Teams.

Final Update: 05/05/2025 09:03:00 AM – Microsoft have confirmed the fix deployment has completed to all impacted infrastructure and validated remediation via internal testing.

Scope of impact: Any user may be impacted by this event if they’re on Outlook on the web, the new Outlook desktop client, or using the new Calendar on Microsoft Teams and have saved Outlook calendar views.

Root cause: A recent service update contains a code issue that’s preventing the service from recognizing saved view calendar IDs.

Next Steps: Microsoft are continuing their analysis of the code change responsible for impact to better identify and prevent similar impact in the future.