Microsoft Services

Warn

Microsoft 365 suite

Title: Some users may be unable to access Office.com or the Microsoft 365 Copilot web sign‑in page User impact: Users may be unable to access Office.com or the Microsoft 365 Copilot web sign‑in page. More info: The impact to Office.com is still occurring, but the impact to Microsoft 365 Copilot web clients, office.com/chat, m365.cloud.microsoft, m365.cloud.microsoft/chat and copilot.cloud.microsoft, have recovered as of March 17, 2026, at 4:05 PM UTC. Users can access Microsoft Copilot through application-based Microsoft Copilot services. This includes, but is not limited to: - Microsoft Copilot desktop app - Copilot in Microsoft Teams - Copilot in Office apps User may be able to leverage https://m365.cloud.microsoft/search, and should be able to sign in using this page. Once signed in, users can access Office.com. Current status: We're continuing to monitor our service health telemetry to ensure that all users regain access to Office.com as our configuration changes are applied to the remaining affected environment. Scope of impact: Impact is specific to some users who are served through the affected infrastructure. Start time: Tuesday, March 17, 2026, at 11:42 AM UTC Root cause: The infrastructure that supports access to Office.com and the Microsoft 365 Copilot web sign-in page is receiving a high volume of traffic that inhibits the rate at which some users' requests are being processed, preventing some users from accessing the service pages. Next update by: Wednesday, March 18, 2026, at 12:30 AM UTC

Last update on Mar 17, 2026 11:09 PM

Warn

Microsoft Copilot (Microsoft 365)

Title: Some users may be unable to access Office.com or the Microsoft 365 Copilot web sign‑in page User impact: Users may be unable to access Office.com or the Microsoft 365 Copilot web sign‑in page. More info: The impact to Office.com is still occurring, but the impact to Microsoft 365 Copilot web clients, office.com/chat, m365.cloud.microsoft, m365.cloud.microsoft/chat and copilot.cloud.microsoft, have recovered as of March 17, 2026, at 4:05 PM UTC. Users can access Microsoft Copilot through application-based Microsoft Copilot services. This includes, but is not limited to: - Microsoft Copilot desktop app - Copilot in Microsoft Teams - Copilot in Office apps User may be able to leverage https://m365.cloud.microsoft/search, and should be able to sign in using this page. Once signed in, users can access Office.com. Current status: We're continuing to monitor our service health telemetry to ensure that all users regain access to Office.com as our configuration changes are applied to the remaining affected environment. Scope of impact: Impact is specific to some users who are served through the affected infrastructure. Start time: Tuesday, March 17, 2026, at 11:42 AM UTC Root cause: The infrastructure that supports access to Office.com and the Microsoft 365 Copilot web sign-in page is receiving a high volume of traffic that inhibits the rate at which some users' requests are being processed, preventing some users from accessing the service pages. Next update by: Wednesday, March 18, 2026, at 12:30 AM UTC

Last update on Mar 17, 2026 11:05 PM

Warn

Microsoft Fabric

Last update on Mar 17, 2026 11:09 PM