Microsoft Outlook Down: Latest Updates on Widespread Email Outage Affecting Thousands of Users

Microsoft Outlook experienced a widespread service outage on November 12, 2026, leaving thousands of users struggling to access their email accounts. The disruption also affected other Microsoft 365 services, including Teams, as users reported problems signing in, opening inboxes, sending messages and accessing online mailboxes.

The outage quickly attracted attention after Downdetector recorded a sharp increase in user complaints. At its peak, more than 130,000 reports of Outlook-related problems were recorded, highlighting the scale of the disruption.

Microsoft acknowledged the issue and confirmed that its engineering teams were investigating connectivity problems affecting Exchange Online mailboxes. The company also identified elevated infrastructure load across multiple regions as a likely contributor to the service disruption.

What Happened to Microsoft Outlook?

The Outlook outage began affecting users on Thursday, November 12, with reports increasing rapidly throughout the day.

Customers experienced different problems depending on how they accessed their accounts. Some could not open Outlook on the web, while others encountered connection errors in desktop and mobile applications.

Several users also reported difficulties sending and receiving emails. In some cases, inboxes failed to load or Outlook repeatedly attempted to reconnect to Microsoft's servers.

Downdetector recorded more than 130,000 Outlook problem reports shortly after 1 p.m. Eastern Time. Reports also increased for Microsoft 365 and other connected services.

Microsoft confirmed that it had received reports of customers experiencing difficulties accessing Exchange Online mailboxes through multiple connection methods in the Americas.

The company tracked the incident under reference number EX1550543 in the Microsoft 365 admin center.

Microsoft Confirms Outlook Service Disruption

Microsoft acknowledged the problem through its official Microsoft 365 Status account, confirming that users were experiencing difficulties accessing their Exchange Online mailboxes.

The company initially focused its investigation on connectivity problems affecting customers in the Americas. However, subsequent updates indicated that the disruption could also affect Microsoft 365 connectivity in other regions.

Microsoft identified elevated traffic affecting part of its infrastructure across multiple regions as a likely cause of the connectivity errors.

The company began investigating whether the increased load resulted from a genuine rise in requests or changes in how traffic was being routed through its systems.

Microsoft's engineering teams also started taking steps to reduce the impact and restore normal service.

Which Microsoft Services Were Affected?

Although Outlook experienced the most significant disruption, users also reported problems with other Microsoft services.

The reported issues included:

• Microsoft Outlook: Users experienced difficulties accessing inboxes, sending emails and connecting to Exchange Online.
• Microsoft 365: Some customers reported connectivity problems across Microsoft's productivity platform.
• Microsoft Teams: Users reported disruptions affecting calls, messaging and other collaboration features.
• Microsoft Copilot: Some outage reports also mentioned difficulties accessing Microsoft's AI assistant.
• OneDrive: Users reported problems accessing Microsoft's cloud storage service.

Microsoft separately acknowledged a Teams disruption affecting North American customers earlier on Thursday and later said that particular issue had been resolved.

However, not every reported problem with these services was independently confirmed as part of the same incident.

How Microsoft Is Working to Fix the Outlook Outage

Microsoft's engineering teams began implementing measures to reduce infrastructure pressure and restore access to affected services.

The company said it had redistributed connection traffic across its worldwide infrastructure and was moving additional traffic away from affected systems.

Microsoft also started restarting impacted servers to bring them back into service.

At the same time, engineers continued investigating the source of the elevated traffic and examining whether changes in network routing contributed to the problem.

Despite these efforts, Microsoft had not provided a definitive restoration timeline in the latest reports available for this coverage.

Users experiencing problems were advised to monitor Microsoft's official service updates for further information.

How to Check Whether Microsoft Outlook Is Down

If Outlook is not working, users can check Microsoft's service status before attempting to troubleshoot their devices.

Here are some useful ways to check for an outage:

1. Microsoft 365 Service Health: Microsoft 365 administrators can check the Service health section in the admin center for incident EX1550543.
2. Downdetector: Visit Downdetector to see whether other users are reporting similar Outlook problems.
3. Microsoft 365 Status: Follow Microsoft's official service-status updates for information about ongoing disruptions.
4. Try Outlook on the Web: Visit Outlook.com to check whether the web version is accessible.

If multiple users are reporting similar problems, the issue is more likely to involve Microsoft's infrastructure rather than an individual device or internet connection.

What Should You Do If Outlook Is Not Working?

If you are still experiencing Outlook problems, consider taking a few basic steps while Microsoft works on its infrastructure.

• Check your internet connection to make sure your device is online.
• Refresh Outlook or restart the application.
• Try accessing your mailbox through a web browser.
• Check Microsoft's official service-status updates.
• Avoid repeatedly changing account settings while a confirmed service disruption is ongoing.

Importantly, resetting your password or reinstalling Outlook is unlikely to resolve an infrastructure-related outage.

Most email systems also temporarily queue undelivered messages and retry delivery later, although users should check for bounced messages or missing emails after service returns.

Is Microsoft Outlook Working Again?

Microsoft has been working to reduce the impact of the November 12 outage by redistributing traffic, moving requests away from affected infrastructure and restarting servers.

However, the available reports do not establish that every affected user has regained access or that the incident has been completely resolved.

Customers should check Microsoft's service-health information for the latest recovery updates, particularly if they rely on Outlook for business communications.

The incident highlights how heavily businesses and individuals depend on cloud-based email services. Even a temporary disruption to Exchange Online can affect communication, productivity and access to important information across multiple organizations.