Microsoft 365 Alert – Service Degradation – Exchange Online – Some users may see the time indicator on their calendars isn’t reflecting accurately or updating – RESOLVED

Announcements Arpan Das

27/08/2025 08:39:00 AM

NHSmail Reference: INC46612167

Microsoft Reference: EX1141935

Issue Status: RESOLVED

Issue Description: Users may see the time indicator on their calendars isn’t reflecting accurately or updating.

More info: Impact is specific to users’ calendars on the new Outlook desktop experience and Outlook on the web.

Affected users can restart the impacted Outlook client to have the time indicator sync and reflect accurately.

Final Update: 04/09/2025 08:48:00 AM – Microsoft have completed deployment of the code change to all users and confirmed through their service health monitoring that the impact is remediated.

Scope of impact: Some users who are viewing their calendar on the new Outlook desktop experience and Outlook on the web may be impacted.

Root cause: A recent Microsoft Edge update introduced a compatibility issue that’s preventing the time indicator from updating and reflecting properly.

Next steps: Microsoft are reviewing their service update testing and validation procedures to identify and prevent similar compatibility issues in deployments moving forward.