Microsoft 365 Alert – Service Degradation – Microsoft Defender XDR – Users may be unable to view Zero-hour auto purge (ZAP) email messages in Microsoft Defender for Office 365 quarantine – RESOLVED

12/03/2026 08:36:00 AM

NHSmail Reference: INC46771472

Microsoft Reference: SW1248804

Issue Status: RESOLVED

Issue Description: Users may have experienced slowness when accessing Microsoft Sway.

Final Update: 12/03/2026 09:05:00 AM –Microsoft has identified that a section of the networking infrastructure relied upon by the Microsoft Sway service experienced network failures. This caused repeated connection retries, resulting in service slowness. They have restarted the affected infrastructure and confirmed that connection retries succeeded, resolving the failures and remediating impact.

Scope of impact: Your organization was affected by this event, and some users attempting to load or access Microsoft Sway may have been impacted.

Root cause: A section of the networking infrastructure relied upon by the Microsoft Sway service experienced network failures. This caused repeated connection retries, resulting in service slowness.

Next Steps: Microsoft are analyzing network data trends on the affected infrastructure to help prevent this problem from happening again.