Microsoft 365 Alert – Service Degradation – Microsoft 365 apps – Users may be unable to install Microsoft 365 apps on their Windows device – RESOLVED

Announcements Shagufta Naaz

18/05/2026 09:08:00 AM

NHSmail Reference: INC46828589

Microsoft Reference: OP1313047

Issue Status: RESOLVED

Issue Description: Users may be unable to install Microsoft 365 apps on their Windows device.

More info: While we were focused on remediation, users may have been able to download the impacted apps using the following link: https://www.microsoft.com/en-us/microsoft-365/download-office?msockid=198f143bce0564771c06020ccf686598

Final Update: 18/05/2026 09:08:00 AM –Microsoft has been alerted to an issue affecting the Microsoft 365apps service in which users may have been unable to install Microsoft 365 apps on their Windows device. Our investigation has determined that a recent configuration change to the components of infrastructure responsible for facilitating Microsoft 365 app installation contained an error that prevented installations from occurring and led to impact. We developed and deployed a fix to resolve this error, and we’ve monitored our telemetry to confirm that the impact is remediated.

Scope of impact: This issue potentially impacted any user attempting to install Microsoft 365 apps on their Windows device.

Root cause: A recent configuration change to the components of infrastructure responsible for facilitating Microsoft 365 app installation contained an error that prevented installations from occurring and led to impact.

Next steps: Microsoft are reviewing our Microsoft 365 apps update and deployment procedures pertaining to the components responsible for facilitating installation to prevent similar impact in future updates.