Microsoft is struggling to restore its cloud services after server failures triggered a cascading disruption across its global infrastructure. Businesses, government offices, schools and financial institutions have reported widespread operational problems.
By PC Bureau
November 13: Millions of users across at least 74 countries faced disruptions to Microsoft’s workplace applications on Friday as a major outage affecting Microsoft 365 continued for more than 16 hours, with the company struggling to restore normal services.
Outlook, Microsoft Teams, Copilot, SharePoint and OneDrive were among the affected applications, disrupting email communications, online meetings, file sharing and other routine operations. Businesses, government departments, educational institutions and financial organisations reported problems accessing essential services.
The outage began on Thursday, November 12, at around 4:15 pm UTC (9:45 pm IST), initially affecting users in the Americas before spreading to other regions within an hour.
Reports on Downdetector, a platform that tracks online service disruptions, surged as the outage spread. Outlook-related complaints peaked at nearly 140,000 globally around 6 pm GMT on Thursday, more than 2,000 times the normal level. Reports involving Teams, Copilot and other Microsoft 365 products also rose sharply.
Microsoft 365 has more than 430 million users worldwide, underlining the potential scale of the disruption, although not all users experienced simultaneous service failures.
Microsoft’s outage reports on November 12 reached 74 countries and territories in about an hour on Downdetector.
Microsoft says its Exchange Online incident began at 16:17 UTC. Reports to Downdetector about Outlook began climbing at about 17:25 UTC, 12:25 in New York. By 18:25, reports about five Microsoft services combined reached 19,650 a minute, against <15 a minute on an average Thursday.
Outlook reports alone peaked at more than 2,000 times their normal level.
Reports did not stay in the Americas. They jumped tenfold in the UK at 17:43, in India at 23:21 local time and in New Zealand at 06:55 local time. Between 17:00 and 18:55 UTC, nearly 3 in 10 reports came from outside the US. We count a country here once its reports reach ten times normal and at least 20 in five minutes.
Reports about Microsoft 365, Copilot, Teams and OneDrive each rose more than a hundredfold, and Azure about a hundredfold. Xbox, GitHub and LinkedIn, also Microsoft’s, rose far less.
Microsoft said a portion of its infrastructure was experiencing elevated load across multiple regions. At 19:38 UTC, reports were still running at more than 11,000 a minute.
— Downdetector (@downdetector) November 12, 2026
Server failures trigger cascading disruption
Microsoft has attributed the outage to an unusually large number of servers becoming unavailable after failing automated health checks.
The loss of server capacity increased pressure on the remaining infrastructure, resulting in connectivity problems and elevated workloads across multiple regions.
The company has said it has found no evidence of a cyberattack or malicious activity. Charles Lamanna, Microsoft’s executive vice-president overseeing Copilot, agents and platform services, also said the company was not aware of any cybersecurity incident.
However, Microsoft has not disclosed a definitive root cause.
Its attempts to restore the affected infrastructure have encountered further difficulties. Some servers returned to service have reportedly become unresponsive again after receiving user traffic.
The company has described persistent traffic-management imbalances and acknowledged that its mitigation efforts have not produced the expected results.
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Outlook, Teams and other applications affected
The disruption is centred on Exchange Online, Microsoft’s cloud-based email infrastructure. Problems with the service have had a cascading impact on applications that depend on it.
Outlook users have reported difficulties accessing their inboxes, sending and receiving emails and using calendar functions across desktop, mobile and web platforms.
Microsoft Teams has continued to work for many users, but meeting scheduling, calendar integration and other features linked to Exchange Online have experienced disruptions.
Other affected services include:
- Microsoft 365 Copilot: Disruptions to AI-powered workplace features.
- SharePoint and OneDrive: Problems accessing files and related cloud-based functions.
- Microsoft Defender XDR and Purview: Disruption to some security and compliance services.
- Intune, Planner and To Do: Problems affecting device management and productivity tools.
- Power BI and Fabric: Degradation in some associated services.
- Universal Print and Microsoft 365 Admin Centre: Interruptions to certain administrative and printing functions.
Consumer services, including Outlook.com, have also reported degradation. Applications and functions that do not depend on the affected infrastructure have remained available in some cases.
Businesses and government offices hit across continents
The outage has disrupted organisations across North America, Europe and the Asia-Pacific region, affecting businesses, government departments, schools, courts and financial institutions.
In the United States, local government offices, including those in Miami Beach, Austin and Jacksonville, reported widespread email problems. Although emergency services were generally unaffected, routine administrative work and internal communications were disrupted.
In Hong Kong, employees at major financial institutions, including Morgan Stanley and Goldman Sachs, reported difficulties accessing email and Microsoft Teams.
Australia faced significant disruption as offices and institutions began operations on Friday. Schools, courts, government departments, health services and businesses reported problems. Some organisations switched to telephone communications and paper-based procedures.
In India, airlines, including IndiGo, reported disruptions to email-based support operations. Brokerages and other financial market participants also encountered difficulties with research reports and client communications.
Government platforms, courts and businesses in Japan, Singapore and the United Kingdom reported delays. Some Singapore courts and government agencies directed users to telephone and alternative communication channels.
The disruption has also affected technology companies relying on Microsoft’s infrastructure. OpenAI and Anthropic reported problems involving Microsoft 365 connectors, affecting services dependent on Microsoft’s systems.
With workplace applications unavailable or unreliable, employees have increasingly turned to personal email accounts, telephone calls and offline arrangements to maintain communications.
The prolonged disruption has also raised concerns about phishing and fraudulent messages as users seek alternative channels to exchange information.
Microsoft struggles to restore normal operations
Microsoft has been issuing regular updates through its Microsoft 365 Status account on X and its service-health dashboard. The disruption has been tracked under incident references EX1550543 and MO1550821.
The company’s recovery measures have included returning portions of the affected server infrastructure to service, redistributing traffic, adjusting network protocols and increasing computing capacity.
However, the process has proved more complicated than anticipated. Some virtual machines have reportedly remained in faulty states, while restored servers have struggled to handle renewed traffic.
In updates issued early Friday, Microsoft said it was continuing efforts to recover frontend servers and optimise traffic distribution. While some regions showed improvements, the company acknowledged that a stable and sustained recovery had not been achieved.
It also warned that restoration could be gradual as additional capacity becomes available and client applications reconnect to the infrastructure.
No firm deadline for the complete restoration of services has been announced. Microsoft’s service-health updates continued to indicate disruptions affecting both business and consumer products on Friday.
Microsoft Outage renews concerns over dependence on cloud services
The prolonged disruption has revived concerns about the growing dependence of businesses and governments on a handful of major cloud-service providers.
Microsoft 365 has become central to workplace operations, with organisations relying on its interconnected applications for email, document storage, online meetings, cybersecurity and internal communications.
The outage has demonstrated how a technical failure affecting one component of a cloud infrastructure can disrupt multiple products and services across different countries.
It has also renewed calls for organisations to strengthen backup arrangements, maintain alternative communication systems and consider multi-cloud strategies to reduce dependence on a single provider.
This is among the notable Microsoft 365 disruptions reported in 2026, adding to questions about the resilience of large-scale cloud infrastructure.
Microsoft has apologised to customers and said its engineering teams are continuing efforts to stabilise the affected services.
Users have been advised to monitor the company’s official Microsoft 365 service-health dashboard and its @MSFT365Status account on X for further updates.
As of Friday afternoon, November 13, full restoration remained pending, with Microsoft yet to provide a definitive explanation of the underlying technical failure or a timeline for the complete recovery of services.
