Last updated: November 12, 2026, 6:15 PM ET. This is a developing story and will be updated as Microsoft shares more.
The Microsoft 365 outage on Thursday, November 12, 2026 knocked Outlook, Teams, SharePoint, OneDrive and Copilot offline for businesses across the Americas, and Microsoft said it could affect users in any region. According to Microsoft, the cause was a group of servers that went down unexpectedly, overloading the rest of its system. Here’s what happened, what caused it, what it means for your business, and five ways to protect yourself next time.
Key takeaways
- When: Thursday, November 12, 2026. Reports spiked around 12:40 PM ET; Microsoft confirmed the issue at 12:54 PM ET.
- What went down: Outlook / Exchange Online, Microsoft Teams, SharePoint, OneDrive, Microsoft 365 Copilot and Microsoft Defender XDR.
- How big: Outlook reports on Downdetector peaked near 128,900, the largest Microsoft 365 outage of 2026 by that measure so far.
- Cause (per Microsoft): servers that were failing automated health checks and became unexpectedly unavailable, not a surge in users. No cyberattack has been reported.
- Status: Teams was restored quickly. As of 6 PM ET, Microsoft was bringing Exchange Online (Outlook) servers back online with a new fix, but had not yet declared the Microsoft 365 outage fully resolved.
- Pattern: it’s at least the fifth notable Microsoft 365 disruption this year.
- Lesson: when email, chat, files and security tools share one platform, one failure stops all of them at once.
What happened during the Microsoft 365 outage
The trouble actually started twice. At 10:40 AM ET, Microsoft reported a problem with Teams for users in North America. That was fixed around noon.
About 40 minutes later, reports started climbing again, this time for Outlook. At 12:54 PM ET, Microsoft confirmed that people in the Americas were having trouble getting into their Exchange Online mailboxes “through multiple connection methods,” and soon after said the issue could affect Microsoft 365 connectivity “for users in any region,” according to ABC7.
Within 15 minutes, Outlook reports on Downdetector hit nearly 129,000, Techaeris reported, while Parade counted more than 130,000 reports across Outlook, Teams and SharePoint by early afternoon.
Microsoft 365 outage timeline (November 12, 2026, Eastern Time)
| Time (ET) | What happened |
|---|---|
| 10:40 AM | Microsoft reports a Teams problem in North America |
| ~12:00 PM | Microsoft says the Teams issue is resolved |
| 12:39 PM | Outlook problem reports begin climbing on Downdetector |
| 12:54 PM | Microsoft confirms Exchange Online mailbox access issues in the Americas |
| 1:07 PM | Microsoft says users in any region may be affected |
| 1:09 PM | Outlook reports peak near 128,900 |
| ~1:35 PM | Microsoft says it has found a likely cause and starts rebalancing traffic |
| Afternoon | Microsoft pauses deployments, moves traffic off affected servers and restarts them |
| ~4:00 PM | Microsoft validates an alternative server health check that returns some servers to service |
| Late afternoon | Microsoft applies the fix more broadly and prepares automated recovery; full recovery not yet confirmed |
Which services were affected
- Outlook / Exchange Online: inboxes not loading, emails not sending or arriving
- Microsoft Teams: chats and calls failing
- SharePoint Online and OneDrive: shared files unavailable
- Microsoft 365 Copilot
- Microsoft Defender XDR: Microsoft’s own security tools
What caused the Microsoft 365 outage?
Microsoft hasn’t published a full post-incident report yet, but it has explained the basics. The problem wasn’t a sudden flood of users. Microsoft said the high load “isn’t driven by an increase in traffic,” but by a number of servers being unexpectedly unavailable, which strained the infrastructure that was still running.
In plain terms: too few servers ended up carrying too much work, and connections started failing. Microsoft later added that some servers were failing automated health checks, the routine tests that decide whether a server is healthy enough to handle traffic. Servers that failed those checks were taken out of service, which left even fewer to carry the load. Microsoft also said it was reviewing an unexpected increase in one specific type of traffic on its service.
To fix it, Microsoft restarted the affected servers, spread connection traffic across its wider worldwide network, and paused new deployments and configuration changes while it investigated, BleepingComputer reported.
Around 4 PM ET, Microsoft reported its first real progress on the Microsoft 365 outage. It said it had validated an alternative service health check method that allowed some of the affected servers to return to service, WBAL reported. It said it was applying that change more broadly and preparing automated recovery systems to keep detecting and restarting unresponsive servers. Microsoft also said it had taken steps to prevent additional servers from being affected, according to CNBC.
There’s no sign this was a cyberattack. Microsoft hasn’t said it was one, and no group has claimed responsibility.
Microsoft 365 outages in 2026: this isn’t the first
What stands out isn’t just the size of this Microsoft 365 outage. It’s how familiar it feels. 2026 has been a rough year for Microsoft’s productivity suite:
- January 22–23: a multi-service outage that dragged on for nearly 10 hours
- July 23: Teams, SharePoint, OneDrive and Copilot went down for users in North America
- August 31: Microsoft blamed a problem with a core sign-in setting shared by many of its services
- November 9: some users in Europe, the Middle East and Africa couldn’t open their mailboxes in Outlook on the web
- November 12: today’s outage
Each outage had a different technical cause, but the lesson is the same every time. And it comes on top of Microsoft 365’s July 2026 price increase, so many businesses are paying more for a service that keeps going down.
What the Microsoft 365 outage means for your business
When your email, chat, files and security tools all run on one giant shared platform, one problem can take down all of them at once. And when that happens, there’s nothing you can do but wait.
For a small or mid-sized business, that adds up fast:
- Lost sales and slow replies. Customers who can’t reach you often move on to someone they can reach.
- Stalled teams. When email, chat and files go down together, there’s no backup channel to fall back on.
- No one to call. On a platform this size, your business is one of millions of customers. You get the same status updates as everyone else.
- Security blind spots. This outage also hit Microsoft Defender XDR, the security tool many companies rely on to keep watch while everything else is down.
What to do if you’re still affected
- Check Microsoft’s status first. Follow the Microsoft 365 Status account, Microsoft’s public status page at status.cloud.microsoft, or your admin center before changing anything on your end. This problem was on Microsoft’s side.
- Don’t keep resetting passwords or reinstalling Outlook. It won’t help with a service-side outage and can create new headaches.
- Switch channels for anything urgent. Call or text customers and staff who are waiting on you.
- Write down what was missed (meetings, orders, emails) so you can follow up once service is back.
5 ways to protect your business from the next Microsoft 365 outage
Outages will happen again. The goal is to make sure the next one is an inconvenience, not a lost day. Here are five simple steps any small business can take:
- Set up a backup email channel on your own domain. When you control your domain, you decide where your email lives. A second mailbox with a different provider means customers can still reach you when one platform fails.
- Don’t put chat, files and email on the same platform. If your team chat and shared files run somewhere separate, an email outage doesn’t also cut off your team.
- Keep an offline copy of what matters most. A current list of key customer, vendor and staff contacts, plus local copies of files you use every day, keeps work moving.
- Write a one-page outage plan. Decide in advance who texts customers, which channel the team switches to, and who checks the status page. Five minutes of planning saves hours of confusion.
- Choose providers you can actually reach. A provider with a real support team that answers your call is worth more during an outage than any status page.
If you’ve been thinking about it, our guide to running business email without Microsoft 365 walks through what to check before you switch.
Take back control with Liberation
At Liberation, we believe your business deserves digital independence: tools you can count on, and real people who answer when something goes wrong.
That’s why we built a complete set of business tools as an alternative to the big-tech suites:
- Liberation Email: professional business email on your own domain, with a friendly webmail inbox you can open from any browser
- Hub For Teams: a shared workspace for your team’s chat, files and projects, all in one place
- Liberation hosting and Liberation Site Builder: keep your website online and in your hands
When you work with Liberation, you’re not one account among millions. You’re a customer of a U.S.-based small business that knows your name. If something ever goes wrong, you’ll hear from us directly, not from a status page.
You also don’t have to move everything at once. Many businesses start by setting up Liberation Email as a backup or second channel, so the next big-tech outage doesn’t stop their business cold. Our team will help you move your mailboxes, files and website over at a pace that works for you. See how a move from Microsoft 365 to Liberation Email works.
Ready to liberate your digital world? Talk to our team today and find out how easy it is to switch to Liberation, so the next outage is someone else’s problem, not yours.
Microsoft 365 outage FAQ
Is Microsoft 365 down right now?
As of about 6 PM ET on November 12, 2026, Microsoft said Teams had been restored and it was returning affected Exchange Online (Outlook) servers to service, but it had not yet declared full recovery. For the current status, check Microsoft’s public status page at status.cloud.microsoft, the Microsoft 365 Status account on X, or, if you’re an admin, the service health page in the Microsoft 365 admin center (incidents EX1550543 and MO1550821).
What caused the Microsoft 365 outage on November 12, 2026?
Microsoft said a number of its servers were failing automated health checks and became unexpectedly unavailable, which put extra load on the servers that were still running. It said the strain was not caused by more people using the service. Microsoft has not yet published a full root-cause report.
Was the Microsoft 365 outage a cyberattack?
There is no indication it was. Microsoft has not attributed the outage to an attack, and no group has claimed responsibility.
Which Microsoft 365 services were affected?
Outlook and Exchange Online, Microsoft Teams, SharePoint Online, OneDrive, Microsoft 365 Copilot and Microsoft Defender XDR. Users also reported problems with Azure and the Microsoft Store.
How many people were affected by the Microsoft 365 outage?
Microsoft hasn’t given a number. On Downdetector, Outlook problem reports peaked at about 128,900 around 1:09 PM ET, and Microsoft 365 reports passed 47,000. Each report usually represents many more affected users.
How can a small business protect itself from the next Microsoft 365 outage?
Keep a backup email channel on your own domain, use a team chat and file tool that doesn’t depend on the same platform, keep an offline list of key contacts, and agree in advance how your team will communicate if email goes down.
Sources
- BleepingComputer: Massive Microsoft 365 outage disrupts Outlook, Teams, Copilot worldwide
- ABC7: Outlook outage, Microsoft reports issues with Teams and email
- Techaeris: Microsoft 365 outage takes down Outlook, Teams and Copilot
- Parade: Is Outlook down today, Nov. 12?
- The Register: Microsoft 365 outage drags on for nearly 10 hours (January 2026)
- CNBC: Widespread Microsoft outage takes down Outlook and other 365 services
- WBAL: Microsoft confirms Outlook outage affecting users worldwide