Outage in Microsoft 365
Some users may be unable to access Office.com or the Microsoft 365 Copilot web sign‑in page
Resolved Minor
March 16, 2026 - Started about 23 hours ago
- Lasted about 12 hours
Incident Report
Summary AI Generated
Some Microsoft 365 users were unable to access Office.com and Microsoft 365 Copilot web sign-in pages due to inefficient traffic processing in a section of service infrastructure. The 12.1-hour outage affected web-based access to office.com and various Copilot web clients, though users could still access Copilot through desktop and mobile applications. Microsoft resolved the issue by implementing configuration changes to optimize traffic routing and monitored service telemetry to ensure recovery.
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 impacted web-client is office.com, and impacted Microsoft 365 Copilot web-clients are office.com/chat, m365.cloud.microsoft, m365.cloud.microsoft/chat and copilot.cloud.microsoft.
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
Current status: We've identified that a section of service infrastructure is not processing traffic efficiently. We're making configuration changes to remediate impact.
Scope of impact: Impact is specific to some users who are served through the affected infrastructure.
Next update by: Monday, March 16, 2026, at 4:30 PM UTC
Components affected
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Latest Updates ( sorted recent to last )
about 12 hours ago - at 03/17/2026 12:27AM
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 impacted web-client is office.com, and impacted Microsoft 365 Copilot web-clients are office.com/chat, m365.cloud.microsoft, m365.cloud.microsoft/chat and copilot.cloud.microsoft.
Users can access Microsoft Copilot through application-based Microsoft Copilot services. This includes but isn’t limited to:
- Microsoft Copilot desktop app
- Copilot in Microsoft Teams
- Copilot in Office apps
User may be able to leverage office.com/search, which redirects to https://m365.cloud.microsoft/search, and should be able to sign in using this page. Once signed in, users can access the impacted web-based office.com and Copilot clients.
Current status: Our service-side telemetry monitoring continues as we're seeing recovery from our latest configuration changes. We're monitoring further to understand if additional changes are needed.
Scope of impact: Impact is specific to some users who are served through the affected infrastructure.
Start time: Monday, March 16, 2026, at 1:05 PM UTC
Next update by: Tuesday, March 17, 2026, at 2:30 AM UTC
about 14 hours ago - at 03/16/2026 10:24PM
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 impacted web-client is office.com, and impacted Microsoft 365 Copilot web-clients are office.com/chat, m365.cloud.microsoft, m365.cloud.microsoft/chat and copilot.cloud.microsoft.
Users can access Microsoft Copilot through application-based Microsoft Copilot services. This includes but isn’t limited to:
- Microsoft Copilot desktop app
- Copilot in Microsoft Teams
- Copilot in Office apps
User may be able to leverage office.com/search, which redirects to https://m365.cloud.microsoft/search, and should be able to sign in using this page. Once signed in, users can access the impacted web-based office.com and Copilot clients.
Current status: We're continuing to monitor our service-side telemetry to ensure our latest configuration changes are working as expected.
Scope of impact: Impact is specific to some users who are served through the affected infrastructure.
Start time: Monday, March 16, 2026, at 1:05 PM UTC
Next update by: Tuesday, March 17, 2026, at 12:30 AM UTC
about 15 hours ago - at 03/16/2026 08:38PM
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 impacted web-client is office.com, and impacted Microsoft 365 Copilot web-clients are office.com/chat, m365.cloud.microsoft, m365.cloud.microsoft/chat and copilot.cloud.microsoft.
Users can access Microsoft Copilot through application-based Microsoft Copilot services. This includes but isn’t limited to:
- Microsoft Copilot desktop app
- Copilot in Microsoft Teams
- Copilot in Office apps
User may be able to leverage office.com/search, which redirects to https://m365.cloud.microsoft/search, and should be able to sign in using this page. Once signed in, users can access the impacted web-based office.com and Copilot clients.
Current status: Our efforts to apply the aforementioned configuration changes are ongoing and we’re monitoring our service-side telemetry to ensure that the configuration changes are having the desired effect. In tandem, we’re determining the most efficient way to reproduce the event in our testing environment so that we can validate our progress.
Scope of impact: Impact is specific to some users who are served through the affected infrastructure.
Next update by: Monday, March 16, 2026, at 10:30 PM UTC
about 18 hours ago - at 03/16/2026 06:16PM
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 impacted web-client is office.com, and impacted Microsoft 365 Copilot web-clients are office.com/chat, m365.cloud.microsoft, m365.cloud.microsoft/chat and copilot.cloud.microsoft.
Users can access Microsoft Copilot through application-based Microsoft Copilot services. This includes but isn’t limited to:
- Microsoft Copilot desktop app
- Copilot in Microsoft Teams
- Copilot in Office apps
User may be able to leverage office.com/search, which redirects to https://m365.cloud.microsoft/search, and should be able to sign in using this page. Once signed in, users can access the impacted web-based office.com and Copilot clients.
Current status: Through analysis of our service-side telemetry, we’ve made additional configuration changes to optimize traffic to the affected infrastructure. Our monitoring of service telemetry tracking successful and failed access attempts continues to ensure the effectiveness of these changes.
Scope of impact: Impact is specific to some users who are served through the affected infrastructure.
Next update by: Monday, March 16, 2026, at 8:30 PM UTC
about 20 hours ago - at 03/16/2026 04:13PM
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 impacted web-client is office.com, and impacted Microsoft 365 Copilot web-clients are office.com/chat, m365.cloud.microsoft, m365.cloud.microsoft/chat and copilot.cloud.microsoft.
Users can access Microsoft Copilot through application-based Microsoft Copilot services. This includes but isn’t limited to:
- Microsoft Copilot desktop app
- Copilot in Microsoft Teams
- Copilot in Office apps
User may be able to leverage office.com/search, which redirects to https://m365.cloud.microsoft/search, and should be able to sign in using this page. Once signed in, users can access the impacted web-based office.com and Copilot clients.
Current status: Our work to optimize the traffic to the affected section of service infrastructure continues. We've made additional configuration changes and are monitoring our service side telemetry to verify its effectiveness.
Scope of impact: Impact is specific to some users who are served through the affected infrastructure.
Next update by: Monday, March 16, 2026, at 6:30 PM UTC
about 21 hours ago - at 03/16/2026 02:28PM
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 impacted web-client is office.com, and impacted Microsoft 365 Copilot web-clients are office.com/chat, m365.cloud.microsoft, m365.cloud.microsoft/chat and copilot.cloud.microsoft.
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
Current status: We've identified that a section of service infrastructure is not processing traffic efficiently. We're making configuration changes to remediate impact.
Scope of impact: Impact is specific to some users who are served through the affected infrastructure.
Next update by: Monday, March 16, 2026, at 4:30 PM UTC
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