Microsoft Outlook Experiences Global Outage Affecting Web and App Access

Image: Microsoft Outlook is down · Source

Microsoft Outlook users worldwide face access issues due to elevated load on infrastructure across multiple regions, causing connectivity errors since early afternoon of November 12, 2026.

On November 12, 2026, Microsoft Outlook users across the globe began reporting widespread difficulties accessing their email via both web and application platforms. The outage, which started just before 1 PM Eastern Time, resulted in intermittent connectivity errors that persisted for several hours.

Microsoft promptly acknowledged the disruption through its Microsoft 365 Status account, attributing the problem to unusually high load on certain infrastructure components spread across various regions. This load increase was identified as a probable cause for the difficulty users experienced in connecting to Outlook services.

Additionally, there were sporadic reports of issues with Microsoft Teams, although some affected users noted that Teams functionality continued without interruption.

By approximately 3:30 PM ET, Microsoft provided an update clarifying that no recent configuration changes corresponded with the outage's onset. The company’s investigation pointed to failed health checks stemming from a specific component on the impacted servers responsible for processing these checks. To mitigate the problem, Microsoft commenced deploying targeted changes to bypass this component on selected servers. They also implemented measures to prevent more servers from going offline while working to restore affected servers to normal operation.

Elevated processor usage on the problematic servers during request handling remained under scrutiny as Microsoft continued to probe the root cause of the outage. The exact timeline for full restoration of service was not specified, and the resolution’s effectiveness in addressing all reported issues remained uncertain at the time.

The outage negatively affected reliability not only of Outlook but also Microsoft's own status pages, which users struggled to load consistently while seeking updates. Monitoring platforms like Downdetector recorded a significant spike in problem reports around the outage start time that had yet to fully subside.

Microsoft has committed to updating users as more details become available regarding the incident's progress and resolution. This outage highlights the vulnerability of critical cloud infrastructure to sudden performance degradations that can ripple across widely used services, underlining the importance of resilient system design and rapid response capabilities.