Microsoft cloud services recover after day-long global outage hits Outlook, Teams and Copilot

What happened

Microsoft has been recovering from a day-long global outage after a cascading software problem knocked out a large share of the company's servers. According to TechCrunch, the failures began on Thursday and were initially flagged as affecting Microsoft's services in the United States and the Americas, but spread around the world as engineers struggled to restore the downed machines.

What started as an outage of Outlook email and Teams video conferencing quickly grew into something far broader. TechCrunch reports that the incident eventually affected Microsoft's cloud services for consumer and business email, files and documents. The company's Copilot AI tools and its Defender security screening software were also knocked offline, and system administrators lost access to their internal Intune dashboards. Some users were additionally unable to reach their cloud-based Windows computers.

A slow recovery

Restoring the services took considerable time. According to TechCrunch, engineers initially could not find the cause of the failures affecting servers in Microsoft's data centers, which extended the disruption.

By Friday morning on the U.S. East Coast, Outlook had begun to recover and some email was starting to arrive again. Doug Madory, director of internet analysis at network monitoring firm Kentik, said in a Bluesky post that traffic was returning to Microsoft's services after about 18 hours of downtime.

Microsoft has not yet explained what went wrong. In status updates reported by TechCrunch, the company said only that the outage involved "a large number of servers being unexpectedly unavailable," and that its investigation was continuing. Microsoft also stated on Friday that it had found no evidence of malicious activity connected to the incident.

TechCrunch adds that a Microsoft spokesperson did not respond when asked whether the company has the technical means, such as logs, to detect malicious activity or to establish what actually happened.

The second major incident in two months

The failure follows another significant Microsoft outage in September, when the company's cloud services were disrupted for days. As TechCrunch notes, Microsoft attributed that earlier incident to a problem with a core authentication configuration that kept users from accessing the service.

The timing will intensify scrutiny of Microsoft's operational resilience, with two large-scale failures hitting the same cloud platform within a couple of months.

Why it matters

The breadth of the outage shows how much critical software now depends on a single provider's infrastructure. A fault that began with email ended up taking out security screening in Defender, device management through Intune, AI features in Copilot and even cloud-hosted Windows desktops, which are services that businesses treat as foundational.

It also raises questions about diagnostics and recovery. Engineers reportedly could not initially identify what was causing servers to fail, and Microsoft has yet to name a root cause or explain in detail how it ruled out an attack. For organisations that run on Microsoft's cloud, an outage the provider cannot quickly diagnose or fix is a reminder that concentrating workloads on one platform carries real availability risk, and that fallback plans still matter even with the largest vendors.