Outage in Microsoft 365 Consumer
Users may be unable to use Microsoft Copilot
Resolved Major
May 29, 2026 - Started about 18 hours ago
- Lasted about 3 hours
Incident Report
Summary AI Generated
Microsoft 365 Consumer experienced a major outage affecting Microsoft Copilot for 3.2 hours, preventing users from accessing the service. The issue was caused by high utilization on the underlying infrastructure supporting Copilot's LLM APIs. Microsoft resolved the incident by applying mitigations to the infrastructure and adjusting routing paths, throttling rules, and retry logic at the service level.
We've identified high utilization on the underlying infrastructure that the Copilot LLM APIs use and are applying mitigations. Additionally, at the Copilot service level, we're reviewing options to change routing paths, throttling rules and retry logic to allow the underlying infrastructure to recover.
Components affected
Microsoft 365 Consumer Microsoft CopilotTrusted by 1,000+ teams
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Latest Updates ( sorted recent to last )
about 17 hours ago - at 05/29/2026 05:01PM
Title: Users may be unable to use Microsoft Copilot
User impact: Users may be unable to use Microsoft Copilot.
Current status: We've identified high utilization on the underlying infrastructure that the Copilot LLM APIs use and are applying mitigations. Additionally, at the Copilot service level, we're reviewing options to change routing paths, throttling rules and retry logic to allow the underlying infrastructure to recover.
Next update by: Friday, May 29, 2026, at 6:30 PM UTC
about 18 hours ago - at 05/29/2026 03:50PM
Title: Users may be unable to use Microsoft Copilot
User impact: Users may be unable to use Microsoft Copilot.
Current status: We're reviewing service telemetry to isolate the source of the issue.
Next update by: Friday, May 29, 2026, at 5:30 PM UTC
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