Microsoft 365 Alert – Service Degradation – Exchange Online – Users may experience errors or failures when accessing their mailbox via one or more Exchange Online connection methods – ONGOING

Announcements Arpan Das

09/06/2026 11:06:00 AM

NHSmail Reference: INC46846524

Microsoft Reference: EX1384966

Issue Status: ONGOING

Issue Description: Users may experience errors or failures when accessing their mailbox via one or more Exchange Online connection methods.

Current Update: 09/06/2026 11:07:00 AM – Microsoft are reviewing service monitoring telemetry to isolate the source of the issue and establish a fix.

Scope of impact: Impact is specific to some users located in the United Kingdom attempting to access their mailbox on Exchange Online via Outlook on the web.

Next update by: Tuesday, June 09, 2026, at 11:30 AM UTC