Microsoft 365 outage disrupted email and collaboration tools in 74 countries, impacting governments and businesses worldwide.
A Microsoft 365 outage disrupted email and collaboration tools across 74 countries and territories, leaving government offices, businesses and public services struggling to communicate. Microsoft reported partial recovery by Friday, November 13, but said some users still faced intermittent problems as it restored capacity and cleared email backlogs.
Summary
Key takeaways
- Outlook, Teams and Copilot were among the affected services.
- Microsoft traced infrastructure strain to unexpectedly unavailable servers.
- Embassies, health facilities and businesses switched communication arrangements.
- Recovery measures included traffic redirection and server restarts.
Microsoft 365 outage reaches users worldwide
Downdetector data showed the outage affecting 74 countries and territories within roughly sixty minutes. Microsoft first looked into Exchange Online connection issues in the Americas, later acknowledging that users anywhere could be affected.
According to Microsoft, the wider incident began on November 12 at 1:26 p.m. Eastern Time. The company’s admin-center notice, MO1550821, flagged connection troubles affecting Exchange Online, Microsoft Teams, SharePoint Online, Microsoft 365 Copilot and Microsoft Defender XDR.
Roughly 430 million people worldwide use the suite. Reports on Downdetector also spiked for Azure, OneDrive and the Microsoft Store, in addition to Outlook, Teams and other Microsoft 365 offerings.
Governments and companies lose access to work tools
Across several countries, the outage disrupted work at both government bodies and private businesses. Italy’s affected offices included the Presidency, various ministries and the Constitutional Court.
According to New Zealand’s foreign minister, email access had been disrupted at every one of the nation’s embassies, consulates and offices globally. Meanwhile, Singapore’s government technology agency noted that institutional emails were being blocked.
Across the United Kingdom, multiple NHS facilities advised patients against depending on web-based communication. Several Westminster MPs lost access to Microsoft products via their parliamentary accounts, and a Parliament spokesperson acknowledged the ongoing issues while noting that backup communication arrangements were being set up.
To keep supporting customers, Air India shifted its email services temporarily, while Workhorse Group delayed its quarterly earnings call.
Microsoft traces overload to unavailable servers
Microsoft attributed the disruption to overloaded infrastructure, then clarified that unexpectedly unavailable servers had strained the systems still operating—not a rise in traffic. It said it was working to return those servers to service safely.
The company said there was no malicious cyberattack behind the disruptions: “At the moment we are not aware of any malicious activity that caused this incident.”
Its recovery measures included pausing deployments, redistributing connections across its worldwide infrastructure, moving traffic away from affected systems and restarting affected servers.
Just after midnight Central European Time, Microsoft reported a partial restoration. By Friday morning, it said its latest traffic-optimization measures were improving stability and capacity, and that it was extending those changes across affected areas.
Recovery remained incomplete. Microsoft said some users still faced intermittent connectivity problems while it prioritized affected environments and worked through delayed email deliveries.
Email-dependent work shifts to alternative channels
The Microsoft 365 outage left organizations changing how they handled urgent communications. Japan’s finance minister asked citizens to telephone authorities about urgent matters until the system was restored, while UK parliamentary staff put alternative channels in place.
Microsoft said earlier service changes had not produced the expected results, prompting efforts to find other ways to increase capacity. It committed to publishing a detailed incident report after resolution, covering the root cause, response measures and other relevant aspects.
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Article produced with the assistance of artificial intelligence and reviewed by the editorial team.
