Microsoft 365 Alert – Service Degradation – Exchange Online – Some users may have been unable to leverage Outlook add-ins or view Calendar free/busy information – RESOLVED

Announcements Sourav Nandi

20/03/2024 09:15:00 AM

NHSMail Reference:INC42041035

Microsoft Reference: EX744850

Issue Status: RESOLVED

Issue Description: Some users may have been unable to leverage Outlook add-ins or view Calendar free/busy information.

More Info: Users may have been unable to leverage Outlook add-ins or view Calendar free/busy information.

Final Update: 20/03/2024 09:12:00 AM – Microsoft have successfully deployed the aforementioned change within the affected infrastructure and after a period of monitoring confirmed that issue is no longer occurring.

Scope of impact: Impact was specific to users who were serviced through the affected infrastructure.

Root cause: A recent update exposed a code regression that was leading to incorrectly rerouted traffic for Outlook add-ins and calendar free/busy information requests.

Next steps: Microsoft are reviewing their update procedures to better identify similar issues during their development and testing cycles.