ThousandEyes actively monitors the reachability and performance of thousands of services and networks across the global Internet, which we use to analyze outages and other incidents. The following analysis is based on our extensive monitoring, as well as ThousandEyes’ global outage detection service, Internet Insights.
[October 9, 2025, 3:30 PM PDT]
At approximately 18:11 UTC on October 9, ThousandEyes observed a network-related incident affecting multiple Microsoft services, including Microsoft 365, Teams, and others. Our data indicates that the incident predominantly impacted users in the United States who were trying to access Microsoft services from AT&T’s network. ThousandEyes data showed significantly elevated packet loss between AT&T and Microsoft networks during the incident. Microsoft confirmed this was a network-related event and addressed the issue by rerouting impacted traffic. The event was fully resolved at 18:48 UTC.
Explore the incident in the ThousandEyes platform (no login required).
