Microsoft 365 Alert : Service Degradation – Exchange Online – Some users may have been unable to connect to the Exchange Online service – RESOLVED

Announcements Aftab Alam

17/03/2022 07:31:00 AM (GMT)

NHSmail Reference : INC27551643

Microsoft Reference : EX343218

Issue Status: RESTORED

Issue Description: Users may have been unable to connect to the Exchange Online service.

Scope of Impact : Impact was specific to some users served through the affected infrastructure in the Netherlands.

Final Update: 17/03/2022 07:31:00 AM – Microsoft identified that a specific section of infrastructure, responsible for directing user mailbox requests, was unexpectedly performing below acceptable performance levels. They redirected user traffic to alternate infrastructure, and confirmed that service availability returned following a period monitoring the affected environment.

Root cause: A specific section of infrastructure, responsible for directing user mailbox requests, was unexpectedly performing below acceptable performance thresholds.