Some users may have been unable to access Microsoft Copilot across multiple Microsoft 365 applications

Timeline (UK time)

1. 28 Oct 2026, 09:29 GMT ✓ Operational

   Title: Some users may have been unable to access Microsoft Copilot across multiple Microsoft 365 applications User impact: Users may have been unable to access Microsoft Copilot across multiple Microsoft 365 applications. More info: Affected applications included Outlook on the web, Outlook desktop, and Microsoft Teams desktop. Final status: We've identified that a section of networking infrastructure, responsible for facilitating Microsoft Copilot access in multiple Microsoft 365 applications, became unresponsive and resulted in impact. While we were in process of developing a fix to apply performance and traffic optimizations, service telemetry indicated that the infrastructure had recovered and we'll monitor system logs to ensure that impact doesn't reoccur. Scope of impact: Impact was specific to some users in South India and Singapore attempting to access Microsoft Copilot across multiple Microsoft 365 applications. Start time: Wednesday, October 28, 2026, at 2:00 AM UTC End time: Wednesday, October 28, 2026, at 9:00 AM UTC Root cause: A section of networking infrastructure, responsible for facilitating Microsoft Copilot access in multiple Microsoft 365 applications, became unresponsive and resulted in impact. Next steps: - We're reviewing performance data and trends on the affected networking infrastructure to help prevent similar issues in the future. This is the final update for this event.

2. 28 Oct 2026, 07:41 GMT ✓ Operational

   Title: Some users may be unable to access Microsoft Copilot across multiple Microsoft 365 applications User impact: Users may be unable to access Microsoft Copilot across multiple Microsoft 365 applications. More info: Affected applications include, but aren't limited to: - Outlook on the web - Outlook desktop - Microsoft Teams desktop Current status: We’re reviewing service telemetry and system logs to isolate the root cause, in order to develop a remediation plan. Scope of impact: Impact is specific to some users in South India and Singapore attempting to access Microsoft Copilot across multiple Microsoft 365 applications. This information may be updated as our investigation continues. Next update by: Wednesday, October 28, 2026, at 9:30 AM UTC