The Microsoft 365 outage disrupted Outlook, Teams and Copilot across 74 countries, with Microsoft reporting limited recovery after hours of service issues.
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The Microsoft 365 outage occurred on Thursday, November 12, when millions of customers were unable to use Outlook, Teams, and Copilot services. According to The Hindu, Microsoft attributed the disruption to elevated load across parts of its infrastructure and said it was working to reduce the impact.
The outage affected 74 countries and territories within an hour. The map displayed by the outage tracking service on X showed that users in the Americas and parts of Europe, Asia, and Africa were affected. Initially, Microsoft's investigation was based on reports from the Americas before the company found that the issue affected service connectivity across all regions.
The company mentioned that the infrastructure issue was causing connectivity errors in several locations. "We have determined that a portion of the infrastructure has high load in multiple regions, and this is likely causing the connectivity error issues," the company stated on X.
According to the company, it was "aggressively pursuing all means of mitigating the impact." This involved stopping deployments, rerouting traffic away from the problematic infrastructure, and restarting the affected servers.
In the U.S., 130,000 users reported issues with Outlook shortly after 1 pm ET, as noted by Downdetector. However, this figure fell to 37,000 by 6 pm ET. Thousands of other users also experienced issues with Microsoft Teams and Copilot.
Throughout most of the working hours in the U.S., Microsoft provided regular updates on its response to the outage. According to its update released shortly after 6 pm ET, the company was "seeing limited recovery" as it redirected user traffic away from affected servers.
"As capacity is restored, users may experience a gradual recovery as their clients reconnect," Microsoft added.
The lengthy Microsoft 365 outage demonstrated how infrastructure issues could affect cloud-based workplace applications. Microsoft reported a partial recovery, but the restoration of full services remained a concern.
Business Honor notes that such outages raise questions about the reliability of cloud-based workplace tools. Disruptions to popular services can affect business communication and productivity across several regions around the world.
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