Microsoft 365 Alert – Service Degradation – Exchange Online – Potential issues accessing mailboxes via one or more connection methods – ONGOING

Announcements Sharmista Mohanta

23/06/2026 08:52:00 AM

NHSmail Reference: INC46858984

Microsoft Reference: EX1401691

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: 24/06/2026 09:17:00 AM –Microsoft is reviewing service monitoring telemetry to isolate the root cause and develop a remediation plan.

Scope of impact: Impact is specific to some users who are served through the affected infrastructure.

Next update by: Tuesday, June 23, 2026, at 12:30 PM UTC