- Microsoft's Service health record for MO1550821 now reads "serviceRestored". Its final update, at 04:17 UTC on 14 November (09:47 IST), confirms recovery across all previously affected environments, and the consumer status post (last updated 03:51 UTC) says services are fully recovered and the email backlog has been processed.
- Preliminary cause: an issue introduced during an earlier network capacity upgrade that surfaced after a recent network change. Microsoft says it was a technical issue, not related to cyber activity or AI/agents. End time given as 4:10 p.m. UTC on 13 November (9:40 p.m. IST).
- Microsoft has apologised for the disruption. A full post-incident report is promised once its review is complete — that is still pending, and this post will be updated again when it lands.
- Sources: Microsoft Service health (status.cloud.microsoft); Reuters via The Economic Times / The Hindu BusinessLine; The Jerusalem Post; Deccan Herald.
Update — 18:30 IST, 13 November 2026 (Microsoft's 13:00 UTC update): Microsoft reports continued recovery progress across affected regions, with broader improvements now observed in North America, sustained improvements across much of Europe, and encouraging recovery signals in Asia Pacific. Some users may still see intermittent access issues or delayed email delivery as mitigation continues across the remaining affected infrastructure. Microsoft's focus is now on stabilising recovered infrastructure, completing mitigation in the remaining impacted areas, and reducing delayed email queues and backlogs, while validating recovery across different connection methods. There is still no evidence of malicious activity, no root cause named, and no full restoration declared — the incident remains listed as "Service degradation". Microsoft's next update is due by 14:00 UTC (19:30 IST), and a full Post-Incident Report with root cause will follow after mitigation.
Update — 13 November 2026, 17:30 IST (12:00 UTC): Microsoft's promised 12:00 UTC update has landed, timestamped 12:00 UTC. Microsoft reports "encouraging recovery progress in Europe" — service availability and email delivery performance are improving across a growing portion of the affected Microsoft 365 infrastructure. Japan "remains comparatively more stable" and North America "is also improving", though some users may still experience intermittent issues as recovery actions continue. Reducing email queues and backlogs remains a priority, and the extended 48-hour email timeout window stays in place to protect delayed messages as delivery catches up. Microsoft repeats that it has no evidence of malicious activity, and says a full Post-Incident Report with root cause will follow after mitigation is complete. The incident is still "Service degradation" — no full restoration has been declared and no root cause has been named. Next update promised by 13:00 UTC (18:30 IST).
Update — 16:34 IST (11:04 UTC), 13 November 2026: Microsoft reports additional progress toward service recovery — recovery actions are now complete across portions of the affected infrastructure in the Asia Pacific region, traffic is being gradually restored, and Microsoft is seeing improvements in key customer scenarios including mailbox access and delayed email processing. Some users may still experience intermittent issues. The focus is now on extending these recovery actions to affected infrastructure in other regions, while continuing stabilisation efforts and adding supporting capacity. Reducing email queues and backlogs remains a priority, and the extended 48-hour email timeout window stays in place to protect delayed messages. Microsoft still has no evidence of malicious activity, and a full Post-Incident Report with root cause will follow after mitigation is complete. The incident remains 'Service degradation' — no full restoration has been declared. Next update promised by 12:00 UTC (17:30 IST).
Update — 13 November 2026, 15:31 IST (10:01 UTC): Microsoft's promised 10:00 UTC update has landed, timestamped 10:01 UTC. Microsoft says recovery actions are ongoing and have 'progressed in phases' across affected Microsoft 365 infrastructure, and that global telemetry and customer reports show 'incremental improvement in several workloads' — a step up from the 'early signs of stabilization' in the 09:10 UTC update. But service health 'remains variable' and capacity 'has not yet fully returned to baseline'. Network and traffic-management actions remain active, and Microsoft is continuing to prioritise queue and backlog processing, with the email timeout window still extended to 48 hours to protect delayed messages. It repeats that it has no evidence of malicious activity causing the incident, and says a full post-incident report with root cause and 'defense-in-depth' actions will follow after mitigation is complete. The incident is still 'Service degradation' — no restoration declared and no root cause named. Next update promised by 11:00 UTC (16:30 IST).
Update — 13 November 2026, 14:40 IST (09:10 UTC): Microsoft's promised 08:30 UTC update has landed, timestamped 09:10 UTC — about 40 minutes late. Microsoft says it is seeing ‘early signs of stabilization’, but service capacity has not yet returned to normal levels and health ‘remains variable’ as traffic is carefully reintroduced. Engineering teams are cycling affected infrastructure through traffic drain, restart, remediation and staged return-to-service, and are evaluating additional mitigation options to improve recovery speed and consistency. As part of the recovery effort, Microsoft is extending the email timeout window to 48 hours to help protect delayed messages while service recovery continues. It repeats that it is not aware of any malicious activity causing the incident, and says a full post-incident report with root cause and ‘defense-in-depth’ actions will follow after recovery is complete. The incident is still ‘Service degradation’ — no restoration declared and no root cause named. Next update promised by 10:00 UTC (15:30 IST).
Update — 13 November 2026, 12:59 IST (07:29 UTC): Microsoft's promised 07:30 UTC update has landed, timestamped 07:29 UTC. Microsoft says it is seeing ‘positive results for server stability’ after applying an upstream authentication/routing configuration component patch to a portion of its infrastructure, and it is now working to expand that patch to servers supporting active regions coming online. This is a step up from the 06:57 UTC update, which reported only ‘marginal success’. It repeats that it is not aware of any malicious activity causing the incident, and will treat the incident with urgency and priority until full resolution; a post-incident report with full root-cause details will follow once mitigated. The incident is still ‘Service degradation’ — no restoration declared and no root cause named. Next update promised by 08:30 UTC (14:00 IST).
Update — 13 November 2026, 12:27 IST (06:57 UTC): Microsoft's promised 07:00 UTC update has landed early, timestamped 06:57 UTC. Microsoft says it is continuing to monitor activity across regions to evaluate server status and determine what can be done to improve capacity, including reviewing server performance and confirming that developed patches have been applied and are working as intended after infrastructure reboots are completed. It reports only 'marginal success' so far. In parallel, it is expanding capacity through the use of Virtual Machines. It repeats that it is not aware of any malicious activity causing the incident, and will treat the incident with urgency and priority until full resolution; a post-incident report with full root-cause details will follow once mitigated. The incident is still 'Service degradation' — no restoration declared and no root cause named. Next update promised by 07:30 UTC (13:00 IST).
Update — 13 November 2026, 11:47 IST (06:17 UTC): Microsoft's promised 07:00 UTC update has landed early, timestamped 06:17 UTC. Microsoft says it is evaluating traffic controls to increase capacity and stability for its frontend servers — traffic throttling, protocol adjustments and failover routing — and expanding internal testing in a contained environment to improve traffic monitoring and issue detection. It repeats that it is not aware of any malicious activity causing the incident, and will treat it with urgency until full resolution; a post-incident report with full root-cause details will follow once mitigated. The incident is still 'Service degradation' — no restoration declared and no root cause named. Next update promised by 07:00 UTC (12:30 IST).
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Image: Microsoft — the Outlook app icon (via Wikimedia Commons).
UPDATE — 13 November 2026, 04:30 IST: Microsoft now says the actions it has taken so far "have not provided the anticipated relief". In its 5:03 p.m. ET update on 12 November, the company said a core process on the affected servers is becoming overwhelmed, which makes the servers stop responding and adds to the capacity loss. It is continuing to pursue "all available pathways to restore service", has named no root cause and has given no time for full restoration. Earlier, Microsoft said it had validated an alternative health-check method that let a subset of affected servers return to service and was applying it more broadly, and it is preparing automated recovery to keep detecting and restarting unresponsive servers. Downdetector reports had fallen from the 130,000 peak to about 56,000 by 3 p.m. ET, but the outage was still ongoing. Microsoft's next updates were due by 6 p.m. ET (EX1550543) and 6:30 p.m. ET (MO1550821). (Sources: Microsoft 365 Status / incident notes, via WebPro News and On-Site Technology.)
📌 KEY HIGHLIGHTS
- The outage: Microsoft Outlook and Exchange Online stopped working for tens of thousands of users on Thursday, 12 November 2026, from around midday Eastern Time (about 9:30 PM IST).
- The scale: Downdetector recorded more than 130,000 Outlook problem reports at 1:27 PM ET (11:57 PM IST), plus over 46,000 reports for Microsoft 365.
- Microsoft's confirmation: The company said it was investigating problems accessing Exchange Online mailboxes "through multiple connection methods in the Americas", tracked as incident EX1550543.
- Recovery: Microsoft now says its actions so far have not provided the anticipated relief; it is restarting servers, validating an alternative health-check method and preparing automated recovery; no time given for full restoration.
- Who is affected: Mainly users in the Americas, with reports also from Canada, the UK and other regions — Microsoft warned the issue "may affect Microsoft 365 service connectivity for users in any region".
What happened?
On Thursday, 12 November 2026, Microsoft's email services went down in a major outage. Reports on Downdetector began spiking just after 12:00 PM ET (10:30 PM IST), and the numbers climbed fast: 22,323 reports about Microsoft 365 by 12:55 PM ET, just under 83,000 Outlook reports just before 1:00 PM ET, and more than 130,000 Outlook reports by 1:27 PM ET (11:57 PM IST), according to Reuters.
Users reported the same symptoms everywhere: Outlook on the web would not load, desktop apps disconnected, mobile apps timed out, and logins failed. Microsoft confirmed the problem through its Microsoft 365 Status account, saying: "We're investigating reports of users experiencing issues accessing Exchange Online mailboxes through multiple connection methods in the Americas." A later update added: "While we're working to mitigate impact, we've confirmed the issue may affect Microsoft 365 service connectivity for users in any region."
The incident is tracked in the Microsoft 365 admin centre as EX1550543. A service-health notice shared by administrators listed the incident's start time as 11:17 AM EST (9:47 PM IST) and said Microsoft had "identified connectivity errors occurring on a portion of Exchange Online infrastructure which receives and processes users' access requests". Engineers were reviewing networking logs to find the source of the errors. A further update at 1:43 PM ET said a portion of the infrastructure was "experiencing elevated load across multiple regions, which is likely contributing to the connectivity errors". The incident is also tracked under MO1550821.
This was not the day's only Microsoft problem. Earlier on Thursday, a separate disruption to Microsoft Teams in North America was fixed around noon ET, according to USA Today — before the Outlook outage peaked.
Microsoft Outlook outage: what we know so far
| Detail | Status | Source |
|---|---|---|
| Outage start | Confirmed — 11:17 AM EST (9:47 PM IST), 12 November 2026 | Microsoft service-health notice (EX1550543) |
| Peak reports | Confirmed — 130,000+ Outlook reports at 1:27 PM ET | Reuters, citing Downdetector |
| Services hit | Confirmed — Outlook and Exchange Online worst hit; smaller spikes for Microsoft 365, Teams and Copilot | Reuters, USA Today, Downdetector |
| Scope | Confirmed — mainly the Americas; Microsoft says any region may be affected | Microsoft 365 Status |
| Cause | Partly confirmed — Microsoft says a large number of servers became unexpectedly unavailable, straining the remaining infrastructure; why the servers went down is still unexplained | Microsoft, via TechCrunch / Detroit Free Press |
| Full restoration | Not confirmed — Microsoft says recovery actions are reducing impact and it is returning servers to service; the company's latest update (12 November) still lists the incident as under investigation | Microsoft, via TechCrunch / USA Today |
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Image: Microsoft — the Microsoft 365 logo (via Wikimedia Commons).
Why it matters
Outlook and Exchange Online are the email backbone for millions of businesses, schools and government offices, so an outage at this scale stops work, not just inboxes. The timing made it worse: the failure hit in the middle of the US working day, with users locked out of mail they needed for meetings, deadlines and customer replies. The smaller report spikes for Teams, Copilot, OneDrive and Microsoft Account show how a single Exchange Online fault can ripple across the Microsoft 365 suite.
It is also a reminder of how concentrated cloud email has become. When one provider's infrastructure has a bad afternoon, there is no quick fallback for organisations that run entirely on it — which is why Microsoft's own advice in these incidents is to watch the official service-health dashboard rather than keep retrying logins. This is a developing story: Microsoft's latest update named the cause (see the update at the top), and we will update this post again when the company confirms full restoration.
What to do if your Outlook is down
First, check whether it is Microsoft, not you: visit Microsoft's status page at status.cloud.microsoft or check the Microsoft 365 Status account before changing any settings. Do not repeatedly reset your password or reconfigure your account — a server-side outage is not fixed from your device, and repeated failed sign-ins can lock you out. If you need to send something urgent, use a different channel (another email account, phone or messaging app) and let the recipient know the Outlook mail may arrive late. Business users should ask their IT admin to check incident EX1550543 in the Microsoft 365 admin centre for tenant-specific status. Your mail is not lost: Microsoft says email and data remain safe during the incident, and messages should flow once the service recovers.
FAQs
Is Microsoft Outlook down right now?
Outlook and Exchange Online suffered a major outage on 12 November 2026, with over 130,000 Downdetector reports at the peak. Microsoft confirmed incident EX1550543 and said recovery actions were reducing the impact, but full restoration had not been confirmed as of the latest update on 12 November. Check status.cloud.microsoft for the live status.
What caused the Microsoft Outlook outage?
Microsoft has now said a large number of servers became "unexpectedly unavailable", straining the remaining infrastructure — and that the elevated load was not driven by a traffic surge. The company has not explained why the servers went unavailable and is still investigating.
Which services were affected by the outage?
Outlook and Exchange Online were hit hardest, across web, desktop and mobile. Microsoft 365, Teams, Copilot, OneDrive and Microsoft Account also saw elevated problem reports, though at much lower levels than Outlook.
Is my email lost because of the Outlook outage?
No. Microsoft says email and data remain safe during the incident — users simply cannot connect to their mailboxes while the fault lasts. Messages sent during the outage should be delivered once the service is restored.
Takeaway: The 12 November Outlook outage was one of the biggest Microsoft 365 failures of 2026, with 130,000+ reports in under two hours — and Microsoft has since named the cause, a large number of servers unexpectedly unavailable, though full restoration is still not confirmed. Watch Microsoft's status page, not your password settings, until the all-clear.
Outlook has had a rough month for a different reason, too: our Microsoft November 2026 Patch Tuesday explainer covers the Outlook zero-day Microsoft patched on 10 November — worth reading if you have not updated yet.
Sources
- Reuters — Microsoft 365, Outlook down for thousands of US users, Downdetector shows
- USA Today — Thousands of users reporting issues with Microsoft Outlook, 365
- TechCrunch — Microsoft's Outlook email hit by new outage (cause update)
- Detroit Free Press — Outlook, Copilot are down. What Microsoft is saying
- MobileSyrup — Widespread Microsoft outage takes down Outlook, Teams and more
- Nexstar / WCIA — Is Microsoft Outlook down? Company confirms 'issues' with email accounts
- Microsoft 365 Status on X — official incident updates (EX1550543)
- Microsoft service health — status.cloud.microsoft
- WebPro News — Microsoft 365 Outage Cuts Off Outlook for Hours
- On-Site Technology — Microsoft 365 and Outlook Outage, Nov 12, 2026: Timeline
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