Microsoft 365 Alert – Service Degradation – Exchange Online – Some users may experience automated email remediation actions affecting more emails than intended in Exchange Online- NEW

21/01/2026 15:21:00 PM

NHSmail Reference: INC46730091

Microsoft Reference: EX1220458

Issue Status: OPEN

Issue Description: Users may experience automated email remediation actions affecting more emails than intended in Exchange Online.

More info: Some users utilising automated remediation based on email subject matching, may experience additional emails being included in a remediation action beyond the originally intended scope

Current Update: 21/01/2026 15:28:00 PM – Microsoft are reviewing support provided information and service monitoring telemetry to isolate the source of the issue and establish a fix.

Scope of impact: Impact is specific to some users attempting to utilise automated remediation based on email subject matching in Exchange Online.

Next update by: Wednesday, January 21, 2026, at 5:00 PM UTC