Microsoft 365 Outage: Outlook, Teams, and Copilot Down for Users Worldwide

A major global Microsoft 365 outage disrupted access to Outlook, Teams, Copilot, and other cloud services on November 12, 2026. According to Downdetector, more 130,000 users have reported facing problems with Outlook at the peak of disruption.

The disruption primarily affected Outlook and Exchange Online, preventing users from accessing their mailbox data, sending or receiving emails, and connecting to various Microsoft services. Consequently, businesses, government agencies, educational institutions, and other organizations that rely on Microsoft’s cloud infrastructure are disrupted.

Microsoft initially reported that users in the Americas were struggling to connect to Exchange Online mailboxes before confirming that the disruption could affect customers in other regions.

According to The Verge, Microsoft Communications Director ‘Ben Hope’ said, “We are aware and investigating reports of users experiencing issues with Microsoft 365 services, primarily issues with Exchange Online. We appreciate our customers’ patience while we work to restore services as soon as possible.”

What caused Microsoft 365 Disruption?

According to Microsoft, the disruption resulted from infrastructure instability and increased server load across multiple regions. The company clarified that the elevated load was not driven by an unexpected spike in user traffic. Instead, a specific component responsible for processing server health caused machines to fail automated checks and drop offline. This shifted their workloads onto the remaining infrastructure, overwhelming the main server process. Further investigation indicated that affected servers were failing automated health checks.

The disruption occurred just two days after Microsoft released its November security updates, which patched approximately 1,094 software vulnerabilities. Those fixes included CVE-2026-124194, an Outlook flaw that hackers are actively using to steal login details when a user opens a malicious file. However, Microsoft has not linked this vulnerability or the security updates to the service outage.

Global Impact on Businesses and Public Services

The Microsoft 365 outage affected organizations across several countries, disrupting routine business operations and public services.

Some reported instances are:

• The US House of Representatives reported that its users were affected, with technical teams working with Microsoft to address the disruption.
• In Colorado, the Arapahoe County Sheriff’s Office reported that jail officials could not receive emails required to process bond payments for detained individuals.
• Unity Health (a major hospital network) in Toronto (Canada), asked patients to call by telephone to arrange appointments because staff members could not send or receive emails.
• In Australia, businesses struggled printing invoices, schools canceled online classes, and staff at the Reserve Bank of Australia lost Outlook access across departments.
• In New Zealand, immigration officials temporarily paused the processing of all visa applications due to the system failure.
• In Japan, officials confirmed that the disruption affected government IT infrastructure.
• Airlines in India, including IndiGo and Akasa Air, reported disruptions to their email support services.

Similarly, thousands of professionals across India when woke up on Friday, they were unable to access mailboxes, losing hours of morning productivity.

Service-by-Service Breakdown of Microsoft Office 365 Outage

According to Microsoft, services that rely directly on Exchange Online are facing major disruptions. Here is how individual platforms are affected:

• Exchange Online: Users cannot access mailboxes via Outlook on the web, Outlook desktop, and Exchange ActiveSync, impacting the email delivery.
• Microsoft Copilot 365: Users finding it difficult to load Copilot Chat or receive responses on web and desktop apps.
• Microsoft Teams: Core functions like joining calls, meetings, group chats, and standard channels remain functional. However, Exchange-dependent features—such as calendar scheduling, meeting invites, contact syncing, Live or Virtual event creation are failing.
• Microsoft Defender XDR: Users fail to load Microsoft Defender portal pages or solution tabs in one go.
• Microsoft Purview: Multiple compliance and security services—including Data Loss Prevention, Communication Compliance, Information Protection policies, eDiscovery search and export, audit searches, and On-Demand Scans are severely impacted.
• SharePoint Online: Accessing files stored directly in SharePoint remains functional, though external file sharing and Exchange-dependent features are failing.
• Microsoft 365 Admin Center: Admins may be unable to load pages in the Microsoft 365 admin center or use Cloud Update & Cloud Policy in the Apps Admin Center.
• Microsoft Graph: API requests involving Exchange Online data, including emails, calendars, and contacts, experienced timeouts.
• Microsoft Planner: Planner is experiencing reliability issues with plan and task operations.

Current Status: What Actions Microsoft is Taking?

Microsoft initiated several measures to restore the affected services, including redistributing connection traffic across its global infrastructure, restarting affected servers, and pausing deployments and configuration changes while investigating the incident.

However, Microsoft found that some servers became unresponsive again after receiving live traffic, complicating the restoration process. Subsequently, the company implemented protective traffic-management measures, tested alternative health-check methods, and explored rebuilding affected servers using an earlier software configuration.

However, recovery remained gradual, with the company continuing to investigate server instability and traffic-management imbalances. Some regions experienced partial recovery, but full and sustained service restoration had not yet been confirmed.

Microsoft’s Recommendations for IT Admins and Users

As Microsoft is still working on mitigating the issue, it has some recommendations for the admins and users:

• Users and administrators should monitor Microsoft’s official Service Health Status page for updates on affected applications and recovery progress.
• Admins should review service advisories in the Microsoft 365 admin center and communicate alternative contact methods to employees and customers wherever necessary.
• Users experiencing Outlook connectivity problems should avoid unnecessary changes to their Outlook profiles or local data files while Microsoft works to restore the affected services.

Wrapping Up

The Microsoft 365 outage on November 12, 2026, disrupted Outlook, Teams, Copilot, and other services across multiple regions. Microsoft’s recovery efforts remained ongoing as of November 13, 2026. However, users are advised to continue checking official service updates for confirmation that Outlook and other Microsoft 365 applications have returned to normal operation.