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Microsoft Outage: What Happened to Outlook and Teams?

A server failure strained Microsoft’s infrastructure and disrupted access to several 365 services; Microsoft said affected servers were beginning to return.

Tech & Online SafetyNovember 13, 20263 min readHow Sureno writes this

The short version

Microsoft’s November 12 outage disrupted Outlook, Teams and other Microsoft 365 services after some servers became unavailable and the remaining infrastructure faced elevated load. ¹²
Users reported trouble with email and access to Word, Excel, PowerPoint, SharePoint, OneDrive and Copilot; reports also included enterprise services. ¹⁴
An outage tracker recorded nearly 130,000 reports globally at the peak, but that figure counts user reports, not necessarily confirmed affected customers. ¹
Microsoft said it was taking steps to limit further server impact and return affected servers to service; reports later fell from their peak. ¹²

What happened in the Microsoft outage?

On Thursday, November 12, users reported problems accessing Microsoft 365 services. Reports involved Outlook email and Teams, as well as other tools used for work and collaboration. ¹²

Microsoft said it was investigating connection problems, especially with Exchange Online, the service behind Microsoft 365 mailboxes. It later said some infrastructure was under unusually high load across multiple regions. ²

What caused Outlook and Teams to stop working?

Microsoft traced the elevated load to a number of servers becoming unexpectedly unavailable. That left more work for the servers still operating and contributed to connection errors, according to the company. ¹²

The company also said the unavailable servers had failed during automated checks. It was testing an alternative way to check server health on some affected machines. The reports do not explain what first caused those servers to fail. ¹

Which Microsoft services were affected?

Reports included Outlook, Teams, Word, Excel and PowerPoint, along with SharePoint and OneDrive. Copilot and some enterprise services were also reported as affected. ¹⁴

Some users said they could not send or receive email or load their inboxes. Microsoft described the issue as affecting Microsoft 365 service connectivity across regions, rather than limiting it to one location. ¹⁴

How many people were affected, and is service back?

The Guardian reported that Down Detector recorded nearly 130,000 reports globally at the outage’s peak. This is a count of submitted reports, not a verified total of people affected. Reports later declined, and Microsoft said servers were beginning to return to service. ¹

The available reports do not confirm that every user or service was fully restored. Microsoft’s status information and the Microsoft 365 admin center were identified as places for further updates. ⁴

What can users do if Outlook or Teams still has problems?

The reports do not provide a specific troubleshooting procedure. If access is still failing, check Microsoft’s service status information or, for an organisation’s Microsoft 365 account, its admin center for current updates. Microsoft said the incident was being investigated and affected servers were being returned to service. ²⁴

Because this was described as an infrastructure problem, repeated attempts by an individual user may not resolve the underlying service disruption. The reports do not establish which workarounds, if any, were available to every affected customer.

What we don't know yet

The reports do not identify the underlying reason the servers failed automated checks. ¹
The sources do not give a confirmed total of affected customers; outage-tracker reports are not the same as a verified customer count. ¹²
The available reporting does not confirm when every affected service and user was fully restored.

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Questions people ask

Why is Outlook not working?

Microsoft said some servers became unexpectedly unavailable, increasing the load on the remaining infrastructure and contributing to connection errors. Users reported trouble loading inboxes and sending or receiving email. ¹²

Was Microsoft Teams down too?

Yes. Teams was among the services users reported having trouble accessing during the Microsoft 365 outage. Reports also included Outlook and other Microsoft 365 tools. ¹⁴

Was the Microsoft outage global?

Microsoft said the connectivity issue could affect users in any region, and the Guardian reported nearly 130,000 outage reports globally at the peak. That number represents reports to an outage tracker, not a confirmed count of affected people. ¹⁴

Did the Microsoft outage affect Word and OneDrive?

Yes. Reports included Word and OneDrive, as well as Excel, PowerPoint, SharePoint and Copilot. The sources do not confirm that every user of each service was affected. ¹⁴

Is Microsoft 365 back online?

Microsoft said affected servers were beginning to return to service, and outage reports fell from their peak. The available reporting does not confirm that all services were fully restored for every user. ¹

Sources

Global Microsoft outage affecting Outlook and Teams users, with company ‘restarting’ servers — the Guardian, 2026-11-12
Microsoft outage hits Outlook. AWS and Google users also report issues — CNBC, 2026-11-12
Is Outlook down? Users report Microsoft outage. — Mashable, 2026-11-12

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