Microsoft restores services after global outage
Following a prolonged disruption to its services, Microsoft announced on Saturday that all its products were once again operational. The outage, which began on Thursday, November 12, and lasted over a day, was attributed to an issue with a network capacity upgrade, prompting the company to apologize to its customers and business partners for the inconvenience.
Global services restored after outage
By Saturday morning, Microsoft’s service health page indicated that all products, including both business and enterprise services under Microsoft 365, as well as consumer products, were functioning normally. The disruption, which started on Thursday, November 12, and continued into Friday, had affected access to various workplace tools, including email, virtual meetings, and cloud-based applications. Although Microsoft noted gradual improvements in affected regions, it cautioned that some users might still experience intermittent issues and delays in email delivery.
Microsoft executives, including Charles Lamanna, executive vice-president for Copilot, Agents and Platform, were quick to dismiss concerns about a potential cyberattack, stating that there was “no indication that the disruption was the result of malicious or cyber activity.” The company’s investigation revealed that the issue stemmed from a technical problem introduced during a previous network capacity upgrade, which was exacerbated by a subsequent network change. This technical issue was not related to cyber activity, artificial intelligence, or AI agents.
The disruption primarily affected Exchange Online, Microsoft’s cloud-based email infrastructure, and had a ripple effect on several dependent services. Users reported difficulties accessing Outlook, Microsoft Teams, Microsoft 365 Copilot, SharePoint Online, and Microsoft Defender XDR, among other services. Additionally, some users encountered problems accessing calendars, scheduling meetings, and retrieving work-related information through Copilot.
Initially, Microsoft attributed the disruption to increased infrastructure load across multiple regions. However, upon further investigation, it discovered that several servers had become unexpectedly unavailable, putting additional strain on the remaining infrastructure. The company emphasized that the issue was not caused by a surge in user traffic. During the recovery process, some servers that were brought back online became unresponsive again when traffic was redirected to them, prompting Microsoft’s engineering teams to explore alternative solutions to restore capacity. The company also made adjustments to traffic management and gradually restored affected infrastructure, closely monitoring stability as users reconnected.
Microsoft addressed the underlying issue and restored services in a phased manner, considering the significant demand for its services. Although this approach prolonged the restoration time, it ensured that services remained stable as users reconnected. The company apologized to its customers and partners for the disruption, acknowledging the critical role its services play in business operations. Microsoft will provide a detailed post-incident report after completing its review of the outage. With over 430 million users, Microsoft 365 is one of the most widely used workplace productivity platforms globally.
