Microsoft 365 Alert – Service Degradation – Exchange Online – Some users may be unable to view location and subject details for other users’ Exchange Online calendar items – RESOLVED

22/07/2026 08:45:00 AM

NHS.net Connect Reference: INC46887125

Microsoft Reference: EX1435168

Issue Status: RESOLVED

Issue Description: Some users may be unable to view location and subject details for other users’ Exchange Online calendar items.

More info: Affected users may only be able to view the free/busy availability of other users’ Exchange Online calendars despite having been configured to also view location and subject details for calendar items.

Final Update: 28/07/2026 09:36:00 AM – Microsoft has confirmed that the deployment of the solution developed to correct the impacting permissions issue has completed, and they have validated with a subset of affected users that the impact has been resolved by their actions.

Scope of impact: Some users attempting to view Exchange Online calendar items for users’ calendars that they’re configured to have access to may be impacted. This information may be updated as our investigation continues.

Root cause: A recent Exchange Online service change introduced a permissions issue that’s preventing some users from viewing location and subject details for other users’ calendars, which is resulting in impact.

Next Steps: Microsoft are reviewing their service change process to ensure similar issues are identified and corrected ahead of deployment to prevent this from reoccurring.