Microsoft’s global communication services were thrown into chaos on Thursday as a massive outage crippled Outlook, leaving hundreds of thousands of users unable to access their emails.
The disruption, which began in the United States, saw reports of service failures climb rapidly from an initial 40,000 to over 150,000 as the issue cascaded across international borders. Users in the UK were among the first to experience the ripple effect, with monitoring site Downdetector recording more than 3,300 reports within just 20 minutes of the first complaint appearing at approximately 5:20 p.m.
Frustrated users reported a variety of issues, including persistent error codes and completely frozen screens, which rendered the service unusable for both personal and professional tasks.
Microsoft addressed the crisis in a series of social media updates, explaining that a “portion of infrastructure” was experiencing an elevated load across multiple regions, leading to severe connectivity failures. “While we’re working to mitigate impact, we’ve confirmed the issue may affect Microsoft 365 service connectivity for users in any region,” the company warned as the outage spread.
To combat the surge in traffic, engineers began redistributing connection requests across their broader worldwide infrastructure. By early evening, the company issued a statement claiming that automated recovery features had successfully restored service health and that customer impact was “fully resolved.”
However, that claim was met with skepticism as reports of downtime continued to flood social media well after the supposed resolution. Adding to the frustration, many users discovered that the Microsoft 365 Admin Center—the very hub where the company directed people to check for service updates—was also offline, leaving IT professionals and standard users in the dark.
One user wrote: “Our entire organization can’t access their email in neither Outlook nor OWA.” Others expressed irritation at the company’s lack of transparent communication, with one noting, “‘M365 is down, please check M365 for more information’… Why not provide more information here? M365 Admin isn’t working either.”
The outage highlights the fragility of Microsoft’s infrastructure as it continues its high-stakes transition from the classic desktop application to the “new Outlook,” a unified, web-based architecture. With over 500 million users worldwide, the platform remains a backbone for global business operations, making such widespread failures a significant disruption to productivity.
While Microsoft insists the situation has been stabilized, many users remain wary as they continue to face intermittent connection errors. The company has not yet provided a detailed explanation regarding the root cause of the elevated load that triggered the worldwide collapse.
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