Microsoft global outage disrupts Outlook, Teams and Copilot in 74 countries
A major Microsoft outage that began on Thursday disrupted Microsoft 365 services including Outlook, Teams and Copilot for users worldwide, with Downdetector recording about 140,000 reports from 74 countries. Microsoft attributed the disruption to elevated load after servers became unexpectedly unavailable, ruling out a cyber-security incident. Fix attempts were initially unsuccessful, with servers failing again once traffic returned. By Friday morning Microsoft reported early signs of stabilisation, though capacity had not returned to normal. Governments, airlines, markets, UK GP surgeries, pharmacies, police, schools and AI firms OpenAI and Anthropic reported knock-on effects.
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- Summary covers the current reports
Cross-source coverage
Common ground
- The outage was a self-inflicted cascade caused by Microsoft's own health-check system and retry storms, not an external attack.
- The same failure mode occurred in November 2024, showing a repeated design flaw that was not fixed.
- There is a dangerous concentration risk: a single company's outage disrupted airlines, health services, and governments worldwide.
- The public received limited and sometimes contradictory information from Microsoft, creating an information asymmetry.
- Liability that scales with the size of the outage, plus a regulator with power to set technical standards, is needed to change incentives.
- The limitation-of-liability clause in Microsoft's contracts is a key obstacle because customers have no real alternative supplier.
Points of contention
- Whether a regulator with subpoena power is sufficient, or whether liability and contract reform must come first.
- Whether the market (competition and customer pressure) could fix the problem faster than regulation.
- Whether the lack of hearings is due to no dollar figure, no body count, or no political constituency.
- Whether visibility (transparency) is the precondition for accountability or a product of liability.
Blind spots
- No one cited a specific dollar cost of the outage, which would be needed to move regulators or courts.
- No one checked whether any regulator or government body actually demanded a post-mortem.
- The discussion did not address how to create real competition or alternative suppliers to reduce switching costs.
- The role of insurance markets in pricing cloud risk and creating pressure for safety was not explored.
WorldAttention’s read
The roundtable agreed that this outage was not a random accident but a repeat of a known design flaw that Microsoft failed to fix. The same retry-storm cascade happened in November 2024 and again now, disrupting critical services in 74 countries. While the mechanism is well understood, the real problem is incentive: Microsoft's contracts cap legal liability while its architecture allows unlimited technical blast radius, and customers have no alternative supplier. The group converged on the need for liability that scales with harm and a regulator with power to mandate technical standards, not just read reports. However, they disagreed on the best path forward—whether regulation must come first or whether contract reform and market pressure could work faster. Key blind spots remain: no one quantified the financial damage, checked for existing regulatory responses, or explored how to create real competition. Until the cost of shipping the same cascade twice changes, it is likely to happen again.
Reporting timeline
Global Microsoft Outage Disables Outlook, Teams and Copilot Services
A major global Microsoft outage has disrupted or disabled services including email, Teams, Outlook and the AI product Copilot, with Microsoft saying the cause was not a cyber-security incident but "elevated load" on its infrastructure. Fix attempts have been largely unsuccessful, though Microsoft reported early signs of stabilisation on Friday morning without capacity returning to normal. Downdetector recorded 140,000 reports from 74 countries, and the true figure is likely higher given Microsoft 365's 430 million users. OpenAI and Anthropic reported knock-on problems, and government agencies in Singapore and Australia plus UK GP surgeries, pharmacies, police and schools were affected. Experts Troy Hunt and Paul Spain warned of far-reaching consequences, with businesses effectively losing a working day.
Read sourceMicrosoft Outage Disrupts Markets, Governments and Airlines Worldwide
A widespread Microsoft outage disrupted Microsoft 365 services including Outlook, Teams and Copilot, according to reports from Bloomberg, Forbes, BBC, NPR and Reuters. Bloomberg reported that the outage gummed up markets and forced traders to use phones. Forbes reported that the Microsoft 365 outage extended into Friday, with governments and airlines reporting disruptions. NPR described Microsoft scrambling to fix an email outage, while Reuters reported the outage hit Outlook, Teams and Copilot worldwide. The aggregated headlines indicate broad cross-sector impact, though specific cause, duration and full scope are not detailed in the available text.
Read sourceMicrosoft outage leaves Outlook mailboxes unreachable for hours
A hours-long outage at Microsoft disrupted access to cloud services including the Outlook email service, affecting businesses and consumers. The disruption impacted a range of Microsoft 365 services; in the Teams office communication offering, tasks relying on calendar integration could fail, and the Copilot AI assistant was partly unavailable for business customers. Microsoft documented its response via posts on X, initially reporting problems with Exchange mailboxes in the US before saying the outage could affect Microsoft 365 users worldwide and that it was trying to route traffic around potentially problematic servers. The company later said it had found a process crippling affected servers and brought some back online, but an hour later reported servers could hang again once traffic reached them. It then attempted to bring up parts of the infrastructure in isolation and reported positive results. How long the outage might last remained unclear. Microsoft's email services had already suffered a hours-long widespread outage in late August, which the company attributed to a problem in its cloud infrastructure.
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Microsoft Global Outage Hits Teams, Outlook and Copilot in 74 Countries
Microsoft is working to resolve a global outage that has disrupted its services, including Teams, Outlook and the AI software Copilot, according to BBC News. The report, published on 13 November 2026, says the affected services are experiencing "connectivity problems." A monitoring website cited in the article reports that the outage is affecting users in 74 countries. The BBC's Claire Keenan provides an explanation of what is known so far about the incident. The article does not specify the cause of the outage, the number of users affected beyond the country count, or a timeline for full restoration. Microsoft has not, in the text provided, issued a detailed statement on the root cause or expected resolution time.
Read sourceMicrosoft says fix for global outage not going as expected
A major Microsoft outage is affecting services including Teams, Outlook, and Copilot, with problems reported in more than 70 countries since Thursday. Microsoft says its attempts to fix the issue are not 'taking as expected' and that the outage was not caused by a cyber-security breach. The UK Parliament reports that parliamentary accounts are down and says alternative communication arrangements are in place. An NHS GP says Microsoft products are 'central' to primary care, warning of disruption, while the National Pharmacy Association says access to NHS email is limited. Schools and Australian spy and federal police agencies also report issues. Microsoft says it is seeing 'early signs of stabilisation' but service capacity has not returned to normal, and it is extending the email timeout window to 48 hours.
Read sourceMicrosoft outage disrupts Outlook, Teams and 365 apps worldwide
A widespread Microsoft outage on Thursday disrupted access to Outlook, Microsoft Teams, SharePoint Online, Microsoft Copilot 365 and other Microsoft 365 services for users around the world. Microsoft said its investigation found that a process on affected servers responsible for establishing secure connections became overwhelmed, causing servers to stop processing requests. The company prepared a configuration change, validated it on a subset of servers, and began reverting a recent network configuration change correlated with the start of impact. Microsoft reported partial recovery across regions where changes were rolled out, though it said the recovery was not sustained, and later cited positive results from restarting affected infrastructure. The outage affected businesses, schools and governments globally, according to reports.
Read sourceMicrosoft Outlook and 365 Outage Persists After 12 Hours
Microsoft's Outlook and Microsoft 365 services remained disrupted more than 12 hours after users in the Americas reported problems accessing Exchange Online mailboxes through multiple connection methods. In a series of posts on X, Microsoft 365 Status said the issue could affect service connectivity in any region and that a portion of infrastructure was experiencing elevated load across multiple regions. The company later determined the load was not driven by increased traffic but by a number of servers becoming unexpectedly unavailable, straining remaining infrastructure. Microsoft paused deployments, redistributed connection traffic, restarted affected servers, and tested a configuration change to address servers failing automated health checks. It later said a core process on affected servers was becoming overwhelmed, and that returned servers could become unresponsive again once receiving traffic. Microsoft said its applied changes were not delivering the expected relief and that it was identifying alternate workstreams to increase capacity amid sustained traffic management imbalances.
Read sourceMicrosoft Outlook Outage Drags On as Retry Cascade Overwhelms Exchange Servers
Microsoft's Outlook service has been down for most of a workday, and the company cannot simply restart it because millions of devices retrying email would hit servers simultaneously and cause another collapse. The outage began when a core process on many Exchange servers started choking at once, reportedly after a rollout spiked CPU usage and pushed racks into maintenance mode. Automated health checks pulled failing servers out of rotation, but users' Outlook apps kept retrying, shifting load to neighboring servers and causing them to fail too. Microsoft first tried spreading connection traffic across its global infrastructure, but said nothing had provided the anticipated relief. Its current plan walls off a slice of servers, restarts them, and lets traffic back in a trickle to avoid a thundering herd. Microsoft said it is seeing positive results. A similar retry-driven outage hit Outlook and Teams in November 2024.
Global Microsoft outage disrupts Outlook, Teams and Copilot for tens of thousands
Microsoft is working to restore services after a major global outage affected tens of thousands of users of its Microsoft 365 platform, including Outlook, Teams and its AI software Copilot. Reports of Outlook issues peaked at nearly 140,000 around 18:00 GMT on Thursday, according to Downdetector. The BBC understands there is no indication the outage was caused by a cyber-attack. Microsoft said the disruption was caused by a number of servers being unexpectedly unavailable, straining remaining systems, and warned that restored services could become unresponsive again. Users in the US, Japan and Singapore reported disruptions. The outage also hit AI companies Anthropic and OpenAI, which work with Microsoft's systems; OpenAI said it was investigating an issue affecting its connections to Microsoft's services. Electric truck maker Workhorse Group rescheduled its quarterly results citing business disruptions.
Widespread Microsoft Outage Takes Down Outlook, Teams and Copilot
A widespread outage hit Microsoft platforms including Outlook on Thursday, November 12, 2026, with nearly 130,000 users reporting problems accessing Outlook just after 1 p.m. ET on outage tracker Downdetector. Many users said they could not send or receive emails or load their inboxes, and thousands also reported issues with Microsoft Teams, AI assistant Copilot, and wider Microsoft 365 services. Microsoft said it was investigating disruptions, particularly affecting Exchange Online mailboxes in the Americas through multiple connection methods. The company said a portion of its infrastructure was experiencing elevated load that likely contributed to connectivity errors, and that some servers became unexpectedly unavailable due to a problem during automated health checks. Microsoft said it was testing a fix and rolling out an alternative method for these checks to restore impacted servers, adding it was aggressively pursuing all pathways to reduce impact. Earlier, Microsoft said it had restored Teams problems in North America, though some users still reported connectivity issues.
Read sourceMicrosoft Outlook Outage Affects Tens of Thousands of Users Worldwide
A large-scale outage of Microsoft's Outlook email service caused access problems for tens of thousands of users on Thursday. Microsoft said the connectivity issues affected users of Microsoft 365 services in all world regions, after initially investigating reports only from the Americas. According to the outage platform Downdetector, nearly 130,000 Outlook problems were reported around 19:00 CET, falling to about 50,000 by 22:30 CET. Thousands of outage reports were also registered for Microsoft Teams and the AI assistant Copilot, both part of the Microsoft 365 cloud offering. Microsoft said on X that part of its infrastructure was experiencing increased load in several regions, likely contributing to the connection errors, and that it was working urgently to reduce the impact. The company said it had halted all new deployments, diverted additional traffic away from affected systems and was restarting servers to restore services. It was unclear when the outage would be fully resolved.
Read sourceWorldwide Microsoft 365 Outage Hits Outlook, Teams and Copilot Users
A worldwide Microsoft 365 outage disrupted Outlook, Teams, Copilot and related cloud services, affecting tens of thousands of users across all regions. Downdetector recorded more than 130,000 outage reports in the US at the peak before problems spread to the Asia-Pacific region. Microsoft said there was no indication of a cyberattack; engineers reported that a process responsible for establishing secure connections was overloaded on affected servers, and the company rolled back a recent configuration change that coincided with the outage's start. Teams meeting scheduling and calendar links failed, and the Copilot AI assistant, the admin portal and third-party interfaces including OpenAI and Anthropic services were intermittently affected. Australia's intelligence service and federal police reported outages, and Canberra activated an agreement with Microsoft for priority restoration. Australia's home affairs and cybersecurity minister, Tony Burke, said Microsoft did not believe it was a cyberattack but rather a faulty update, similar to the 2024 CrowdStrike incident. The US House of Representatives also reported restrictions, and Workhorse Group delayed its quarterly results. Microsoft said it was seeking alternative ways to add capacity, with no clear timeline for full restoration.
Read sourceWorldwide Microsoft 365 outage disrupts Outlook, Teams and Copilot for tens of thousands
A worldwide Microsoft 365 outage on Thursday disrupted access to email and workplace services for tens of thousands of users. Microsoft said connection problems affected Microsoft 365 users in all world regions, after initially investigating reports only from the Americas. According to the outage platform Downdetector, nearly 130,000 Outlook problems were reported around 19:00 CET, falling to about 50,000 by 22:30 CET. Thousands of outage reports were also registered for Microsoft Teams and the AI assistant Copilot, both part of the Microsoft 365 cloud offering. Microsoft said on X that part of its infrastructure was experiencing increased load in several regions, likely contributing to the connection errors, and that it was working urgently to reduce the impact. The company said it had halted all new deployments, diverted additional traffic away from affected systems and was restarting servers to restore services. It was unclear when the outage would be fully resolved.
Read sourceWidespread Microsoft outage disrupts Outlook, Teams and 365 services
Microsoft experienced a widespread outage on Thursday affecting thousands of users across regions, according to Downdetector.com. The disruption began shortly before 1 p.m. and impacted Microsoft 365 services, Outlook and Teams, with about 130,000 users reporting issues with Outlook. Microsoft said it was investigating issues primarily with Exchange Online. The company initially attributed the connectivity problems to elevated load across multiple regions, later determining that the load was caused by a number of servers being unexpectedly unavailable, straining remaining infrastructure, and some servers failing automated health checks. By 4 p.m., Microsoft said it had validated an alternative service health check method that brought some affected servers back online and was applying the change more broadly while preparing automated recovery systems. Amazon said its services were operating normally and that an unrelated disruption elsewhere on the internet was prompting inaccurate reports.
Read sourceMicrosoft Reports Outlook and Teams Outages Across North America
Microsoft reported service disruptions affecting Exchange Online mailboxes and Microsoft Teams on Thursday. The company initially said users in North America were experiencing issues accessing or using Teams functionality, and later reported problems with Exchange Online mailboxes in the Americas. Microsoft said the mailbox issues could stem from infrastructure experiencing elevated load across multiple regions, then clarified that the elevated load was caused by a number of servers being unexpectedly unavailable rather than increased traffic. The company said its mitigative actions restored Teams service health and functionality. For the mailbox issue, Microsoft said it paused all deployments, moved additional traffic off affected infrastructure, and restarted affected servers. Downdetector also reported issues with Teams and Outlook. Microsoft noted the Exchange Online issue may affect Microsoft 365 service connectivity for users in any region.
Read sourceMicrosoft Reports Outlook and Teams Outages Across Americas and North America
Microsoft reported service disruptions affecting Exchange Online mailboxes and Microsoft Teams on Thursday. The company initially said users in North America were experiencing issues with Teams functionality, and later reported that users in the Americas were having trouble accessing Exchange Online mailboxes through multiple connection methods. Microsoft attributed the mailbox issues to infrastructure experiencing elevated load across multiple regions, later clarifying that the load was caused by a number of servers being unexpectedly unavailable rather than increased traffic. The company said its mitigative actions restored Teams service health and functionality, and for the mailbox issue it paused all deployments, moved additional traffic off affected infrastructure, and restarted affected servers. Downdetector also reported issues with both services.
Read sourceMicrosoft Reports Outlook and Teams Outage Across Multiple Regions
Microsoft reported disruptions on Thursday affecting Exchange Online mailboxes and Microsoft Teams. The company initially said users in North America were experiencing issues with Teams functionality, and later reported problems accessing Exchange Online mailboxes through multiple connection methods in the Americas. Microsoft said the mailbox issues could stem from infrastructure experiencing elevated load across multiple regions, later clarifying that the load was driven not by increased traffic but by a number of servers being unexpectedly unavailable, straining remaining infrastructure. The company said its mitigative actions restored Teams service health and functionality, and that the Exchange Online issue may affect Microsoft 365 service connectivity in any region. Microsoft said it paused all deployments, moved additional traffic off affected infrastructure, and restarted affected servers. Downdetector also reported issues with Teams and Outlook.
Read sourceMajor Microsoft 365 and Outlook Outage Blocks Email Access Across the Americas
Microsoft's 365 business and enterprise services suffered a major outage on Thursday, preventing users from accessing accounts and email. Around 10:40 am ET, Microsoft reported investigating issues with Microsoft Teams in North America, and by just before 1pm ET it acknowledged problems accessing Exchange Online mailboxes through multiple connection methods in the Americas. Microsoft said its network was experiencing elevated load across multiple regions, attributing the issue to servers going offline rather than increased traffic. The company paused deployments, redistributed connection traffic across its worldwide infrastructure, and restarted affected servers. Impacted services may include Exchange Online, Microsoft Teams, SharePoint Online, Microsoft Copilot 365, and Microsoft Defender XDR. Downdetector reports began falling around 1:15 pm ET. Microsoft said a problem was causing servers to fail automated health checks and become unavailable. There is currently no indication that a cyberattack caused the outage. Microsoft previously suffered a major outage in July 2024 after a corrupted Crowdstrike update.
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