Teams issues began 15:40 UTC (TM1550488); Exchange Online mailbox access failed from about 17:54 UTC (EX1550543), first in the Americas, then any region; broader incident MO1550821. Microsoft says many servers failed automated health checks, leaving the rest to carry the load though total traffic had not increased; it found no recent change correlated with the start, stopped more servers from being affected, paused deployments and was testing a workaround that bypasses the health-check component. Downdetector logged reports from 74 countries. Microsoft has disclosed no malicious activity.
What to do: Nov 13: Ran about 24 hours with broad recovery by Nov 13 afternoon; Microsoft says "This was a technical issue not related to cyber or AI / agents", introduced during an earlier network capacity upgrade that surfaced after a recent network change. Email timeout extended to 48 hours; no ETA for full recovery as of 20:05 UTC; extended monitoring at 21:55 UTC. Hit Australia's ASD and federal police…
We're investigating reports of users experiencing issues when accessing or using Microsoft Teams functionality in North America, and more details can be found in the Microsoft 365 admin center under TM1550488.
We've confirmed related impact scenarios and have updated TM1550488. Our automated recovery features have taken action to restore service, and our telemetry indicates that these actions are effectively reducing impact. More details can be found in the Microsof
We're investigating reports of users experiencing issues accessing Exchange Online mailboxes through multiple connection methods in the Americas. More details can be found in the Microsoft 365 admin center under EX1550543.
While we're working to mitigate impact, we've confirmed the issue may affect Microsoft 365 service connectivity for users in any region, more information will be provided in the Microsoft 365 admin center under EX1550543.
We've not identified any recent change correlated with the start of impact; however, our investigation indicates the failed health checks may originate from a specific component that's responsible for processing server health. We've taken steps to prevent addi
Microsoft's outage reports on November 12 reached 74 countries and territories in about an hour on Downdetector. Microsoft says its Exchange Online incident began at 16:17 UTC. Reports to Downdetector about Outlook began climbing at about 17:25 UTC, 12:25 in
Why this score
Plan rubric with caps (verified sweep, Nov 12)