Microsoft Grapples with Widespread Outlook and Microsoft 365 Outage Affecting Global Users

Microsoft is continuing its efforts to restore full access to its suite of workplace applications, hours after a significant outage began impacting services. The company has indicated that users might still experience difficulties connecting to essential products such as Outlook email and its chat services. The disruption, which commenced during the US workday on Thursday, affected Outlook, Teams, and the Copilot artificial intelligence service for a considerable number of users across the United States, as well as customers in the UAE and globally.

Microsoft's products are widely utilized by businesses, government agencies, and educational institutions. Users of various Microsoft tools, including Outlook email, have reported issues with sending and receiving messages. Despite extensive troubleshooting efforts, the exact cause of the outage remains unknown. In an update posted on X on Friday morning, Microsoft stated, "We’ve monitored the status of the changes applied to improve serviceability and confirmed they're not taking as expected." The company added, "We’re identifying alternate workstreams that can be applied to increase capacity in the face of sustained traffic management imbalances."

Earlier on Thursday, Microsoft had posted on X that users in "any region" could be affected, and a spokesperson commented, "We appreciate our customers’ patience while we work to restore services as soon as possible." Throughout Thursday, Microsoft expanded the list of affected products, noting that services for technologists, including cybersecurity software, file-sharing services, and administrator tools, were also disrupted.

Microsoft's status website first acknowledged the issue early Thursday afternoon, US time, with a message stating, "Users may be unable to connect to their mailboxes in Exchange Online through multiple connection methods." The company further elaborated, "We’ve collected networking logs to further investigate the source of these errors and confirm our next steps." According to Downdetector, a service that monitors internet outages, users worldwide have reported problems with Microsoft Teams, Copilot, and Teams.

Microsoft has classified the Outlook issue as a "service degradation." A subsequent social media post detailed the company's remediation efforts: "We've begun redistributing connection traffic across our broader worldwide infrastructure to help balance the load." By 2:10 PM, Downdetector data suggested that services were beginning to recover for some users, though many continued to experience problems for several more hours.

Microsoft later confirmed via its service health status update page that the technical issue was broadly impacting its Microsoft 365 productivity software suite. The technology firm also announced it had gained more insight into the problem's cause, stating, "We determined the elevated load isn't driven by an increase in traffic, but by a number of servers being unexpectedly unavailable."

The outage affected governments and companies globally. For instance, Michigan's department of technology, management and budget posted on social media, "Due to a widescale outage impacting Microsoft 365 across North America, the State of Michigan is currently experiencing technical issues with email and other Microsoft applications," warning that "responses to emails may be delayed during this time."

Later in the evening, Microsoft indicated it was still working to open "all available pathways to restore service," but noted that these efforts "have not provided the anticipated relief." The company then shifted its strategy to "re-isolating a portion of infrastructure" and restarting certain components it suspected were causing the problem. More than seven hours after the initial reports, Microsoft continued to issue updates on its progress.

Microsoft warned that some servers might become unresponsive once traffic resumed. "We're analyzing diagnostic data to determine what's triggering the behavior ... in parallel, we're temporarily limiting which types of traffic can reach the affected infrastructure in some location," the company posted on X. This is a developing story.