The Microsoft Outage Is a Warning for the World

A dramatic Microsoft 365 outage impacting widely used services like Outlook, Teams, and Copilot dragged into a second day on Friday after the company failed overnight to resolve an issue that left institutions and individuals around the world without crucial communication tools. The services did seem to be on a slow path to recovery by midmorning on Friday.

“We’re observing sustained improvements in service availability,” Microsoft said in a statement posted to its status dashboard on Friday morning. The company had said on Thursday evening that its initial attempts to fix the problem were “not taking as expected.”

The outages have caused widespread disruption to schools, courts, governments, and law enforcement agencies—plus countless businesses and millions of employees—around the globe, highlighting how many of the world’s most crucial systems rely upon technologies from a small number of tech companies. And when they fail, the ramifications can be huge.

Microsoft has not said yet what caused the outage but has hinted that it was related to cascading server failures inside multiple data centers around the world that shifted too much load onto remaining operational machines.

“We determined the elevated load isn’t driven by an increase in traffic, but by a number of servers being unexpectedly unavailable; straining the remaining infrastructure,” the company wrote in Microsoft 365 Status update on Thursday afternoon. “We’re testing a configuration change to address a problem that’s causing servers to fail automated health checks and become unavailable,” the company added a few minutes later.

An additional update a few minutes after that noted, “We’ve not identified any recent change correlated with the start of impact; however, our investigation indicates the failed health checks may originate from a specific component that’s responsible for processing server health.”

Microsoft emphasized repeatedly in statements that there was no indication of the outage being caused by a cyberattack.

“This is absolutely going to go down as one of the big ones, up there with the Facebook outage of October 2021,” says Doug Madory, director of internet analysis at monitoring firm Kentik. “We don’t know the root cause yet, but it is interesting to break down the traffic by source data center. The recovery came in fits and starts and varied greatly by source, probably due to Microsoft’s efforts to bring the service back online.”

A prolonged outage of such a critical underlying digital service is not unprecedented, but Microsoft has a special position among cloud providers as an older company that was already ubiquitous in global computing from the PC era. Many organizations integrate Microsoft productivity services at the core of their operations, simply because they have used Windows computers for decades and have longstanding relationships with Microsoft.

“What makes this particularly significant is the criticality of the services affected, especially email and communication systems relied upon by government and other essential organisations,” says Swapneel Patnekar, the CEO of Indian web security firm Shreshta IT Technologies. “The impact goes well beyond the inconvenience of a typical service disruption.”

Many observers pointed out on Thursday and Friday that Microsoft has recently shed staff through attrition, layoffs, and buyout offers. The company’s annual filings say it had 223,000 full-time employees on June 30, down from 228,000 at the same time in 2025. Then in July, the company eliminated 9,000 jobs globally, of which 3,200 were cuts related to an overhaul of its Xbox teams. In October, the company reportedly made buyout offers to 60,000 employees, though apparently this was intended to speed attrition, not cull all of those roles.

Then there’s the AI factor. Microsoft CEO Satya Nadella said in April that as much as 30 percent of the code the company is generating is now written using AI in automated tools.

“Satya’s recent comments have a much different look today than they did even a week ago,” says Jake Williams, a faculty member at IANS, an intelligence and security consultancy. “I don’t think we’ll ever be able to say that the staff reductions caused this outage, but you’ll never convince me that all the tribal knowledge that walked out the door wouldn’t have been invaluable in resolving it.”

Microsoft did not immediately respond to a request for comment.

Reports of widespread disruption from the Microsoft outage started appearing during the working day on Friday in countries in Asia and Australasia, spreading across the world as more people logged on.

Schools, retail stores, courts, and medical organizations across Australia said everything from exams to health care appointments were disrupted. “Medical scans have been cancelled due to both myself and the clinic not being able to access referrals via email or fax,” one person told Australian media. Officials in Japan’s government said its own platforms had been disrupted, and staff were using phones and chat tools as they couldn’t access Outlook.

In the UK, multiple police forces have said they are unable to accept online crime reports due to the outages of Microsoft services, though phone lines for emergency and nonemergency reports remained available. Parts of the National Health Service, including doctor surgeries and hospital services, also reported that some services were impacted by the outages. “Those who work in 111 and 999 services are unable to refer patients in the normal way—creating a massive backlog,” the GMB trade union posted on X, referring to nonemergency and emergency health services.

Meanwhile, Deutsche Bahn, the provider of train services across Germany, updated its alerts page saying the email outages “severely restricts the sending of timetables.” Courts, local government agencies, and media organizations in the Netherlands reported issues with their communications services, according to local press. In France, some health agencies and local governments also reported similar issues. One winemaker in South Africa told the BBC his company had been brought to a standstill by the outages.

Unsurprisingly, these disruptions continued to be echoed across Canada and the US as millions of people have attempted to sign on. Canadian rail service Via Rail posted online that customers may not receive details of their booked trips via email, with with York’s Department of Investigation posting on X that housing evictions planned for Friday had been canceled and Arapahoe County Sheriff’s Office, in Colorado, also posting on X that a lack of email notifications means bond payments being made online were not being processed.

“It’s literally named 365. That implies a specific duty,” says longtime security and compliance consultant Davi Ottenheimer. “Can’t sell an empty bottle called ‘Bottle of Water.’”

During the outage, multiple officials around the world called for countries to rely less on giant tech firms or reevaluate their relationships. “The global Microsoft outage only serves to highlight once again the lack of resilience in the UK’s digital infrastructure, and the dangers that this dependency can pose to our security, economy and public services,” Chi Onwurah, the chair of the UK parliament’s Science and Technology Committee, said in a statement.

Since the start of the second Trump administration—with its chaos, unpredictability, and threats changing the nature of international relationships—countries across Europe and other parts of the world have been starting to change their attitudes and reliance on some US-based big technology firms, such as Google, Microsoft, and Amazon Web Services. Officials in France have been developing local, open source alternatives to Zoom, Teams, and other productivity software, while WIRED has documented dozens of other European efforts to ditch US big tech services.

Patnekar, from Indian security firm Shreshta, says that while much tech infrastructure has been provided by centralized services in recent years, email seems particularly challenging to create resiliency. “Ultimately, the lesson isn’t necessarily that organisations should stop relying on large technology providers,” Patnekar says. “Rather, they need to identify which services are genuinely mission-critical and ensure they have an independent fallback when those providers become unavailable.”