Microsoft 365 Alert – Service Degradation – Exchange Online – Some users may be unable to access or load Outlook on the web – ONGOING

Announcements Shagufta Naaz

23/01/2026 11:23:00 AM

NHSmail Reference: INC46731927

Microsoft Reference: EX1221742

Issue Status: ONGOING

Issue Description: Users may be unable to access or load Outlook on the web.

Current Update: 23/01/2026 13:42:00 AM – Microsoft have completed a rollback of recent changes and restored the service to a stable configuration. Our monitoring shows that availability is improving across affected regions, but some environments are still experiencing issues. Additionally, we’ve identified an update that caused unexpected behavior and are working on a fix to deploy once fully validated.

Scope of impact: This issue may impact any user within your organisation served via the affected region(s): United States, France and United Kingdom. This information may be updated as our investigation continues.

Next update by: Friday, January 23, 2026, at 2:30 PM UTC