Is Microsoft Teams Down? Which Microsoft 365 Services Were Affected in the November 2026 Outage
Last checked: about 12 noon SGT, Friday 13 November 2026.
When Outlook goes quiet, the next thing everyone does is open Teams to ask whether Outlook is down. This week that plan had a flaw.
The quick answer: Microsoft listed Teams among the services that may be affected by the Microsoft 365 incident MO1550821, alongside Exchange Online, SharePoint Online, Microsoft 365 Copilot and Microsoft Defender XDR. Microsoft said Exchange was the primarily impacted service. There was also a separate, earlier Teams incident in North America on the same day, which Microsoft reported as resolved.
Is Microsoft Teams down?
Teams was on Microsoft's list of services that may be affected, and Downdetector showed a rise in Teams reports, though far smaller than for Outlook. As with Outlook, recovery has been gradual, so your Teams may be fine while a colleague's is not. In the updates we found, Microsoft had not declared the wider incident resolved.
For the live answer, check Service health in the Microsoft 365 admin center or status.cloud.microsoft. See how to check Microsoft 365 status.
Which Microsoft 365 services were affected?
| Service | What you use it for | Listed as possibly affected? |
|---|---|---|
| Exchange Online | Outlook email and calendar | Yes, the primarily impacted service (EX1550543) |
| Microsoft Teams | Chat, calls, meetings | Yes (MO1550821) |
| SharePoint Online | Team sites and shared files | Yes (MO1550821) |
| Microsoft 365 Copilot | AI assistant | Yes (MO1550821) |
| Microsoft Defender XDR | Security monitoring | Yes (MO1550821) |
| Planner, To Do, Intune, Defender for Office 365 | Tasks, device management, email security | Added to the list later, as reported by ABC7 |
Source: Microsoft's advisory MO1550821 as reported by BleepingComputer and ABC7. Microsoft's own list is in the admin center under MO1550821.
Why were there two Teams incidents?
Earlier on the same day, Microsoft tracked a separate Teams issue for users in North America under the reference TM1550488 and later said it was resolved. The wider Microsoft 365 incident came afterwards. Microsoft has not said whether the two are related, so neither will we.
Source: BleepingComputer; Windows Report.
Why would an email problem affect Teams and Copilot?
Microsoft has not published a root cause. What it has said is that Exchange was the primarily impacted service and that it identified additional Microsoft 365 services with connectivity issues, which it tracked separately under MO1550821. We explain the general idea of AI assistants depending on the mailbox in our post on AI connectors during the outage.
How do you keep the office talking when Teams and Outlook are both unreliable?
This part is SourceIT's own suggestion.
- Pick up the phone. It still works, and it is faster than three unanswered chats.
- Use a channel your company has already approved as the fallback, and say which one in advance.
- Keep customer data out of personal chat apps. An outage does not suspend your data protection duties. See is an email outage a data breach under the PDPA?
- Move today's meetings to a phone bridge or reschedule the ones that can wait.
- Write the fallback down afterwards. See email continuity for SMEs.
The office plan for "email is down" was "ask on Teams". Every plan needs a Plan B that is not owned by the same Plan A.
Related products and solutions from SourceIT
Nothing here would have prevented a Microsoft-side outage, and we will say plainly which items depend on Teams itself.
| If you want to | Look at | Honest note |
|---|---|---|
| Keep your own copy of shared files and mailboxes | Synology backup and data protection for business and the Synology NAS range | A local copy stays readable when the cloud service is not |
| Equip meeting rooms and desks for everyday Teams calling | Yealink phones certified for Microsoft Teams | These rely on the Teams service, so they are for normal days, not a fallback |
| Review which Microsoft 365 plan you are on | Microsoft 365 for Business plans | Useful when checking what your plan includes |
For help choosing, call (65) 6978 3502, email Sales@sourceit.com.sg or use our contact page.
More on the Microsoft 365 outage
- Latest update and timeline in Singapore time
- What to do, with an IT manager checklist
- Outlook not working after the outage: how to fix it
- Are emails lost during a Microsoft outage?
Frequently asked questions
Is Microsoft Teams down? Microsoft listed Teams among the services that may be affected by incident MO1550821 on 12 to 13 November 2026. Check Service health for the current status.
Was SharePoint affected by the Microsoft outage? SharePoint Online was on Microsoft's list of services that may be affected under MO1550821.
What is TM1550488? It is Microsoft's reference for a separate Teams incident in North America earlier on 12 November 2026, which Microsoft reported as resolved.
This article is general information compiled from the sources above as at the time shown. It is not a statement by or on behalf of Microsoft. Microsoft, Microsoft 365, Teams and Outlook are trademarks of the Microsoft group of companies. Refer to Microsoft's official channels for the current status.
