A major disruption to Microsoft's cloud services left businesses struggling to access email, workplace applications and AI-powered tools on Thursday, November 12, 2026. Problems continued into Friday, November 13, as the company acknowledged that some attempts to restore affected infrastructure had failed to produce sustained improvements.

The global Microsoft outage generated reports from 74 countries and territories, according to Downdetector. Although disruption was widespread, the incident did not disable every Microsoft service. The most serious problems centred on Exchange Online and applications dependent on its infrastructure.

Microsoft outage: How Many Users and Services Were Affected?

Downdetector recorded 138,058 Outlook problem reports around 1 p.m. Eastern Time on November 12, according to Reuters. By that evening, reports had declined to approximately 34,490, although many customers continued experiencing difficulties.

The Outlook outage prevented some users from opening mailboxes, sending messages or accessing emails through web, desktop and mobile applications. Exchange Online connectivity problems also disrupted calendar functions and delayed email delivery.

Microsoft 365 recorded more than 38,000 problem reports during one Reuters snapshot, while Teams received approximately 4,500 reports. These figures represent user-submitted complaints rather than a verified count of affected individuals. The disruption also reached SharePoint Online, Microsoft Defender XDR, Planner, Purview, Power BI and other cloud-dependent services. However, availability varied by application and feature.

What Caused Microsoft's Cloud Services to Fail?

Microsoft identified problems involving servers that unexpectedly failed automated health checks, leaving fewer machines available to process customer requests. A process responsible for establishing secure connections was also becoming overwhelmed. This reduced processing capacity and contributed to connectivity errors across affected infrastructure.

The Outlook outage proved difficult to resolve because some restarted servers became unresponsive again after receiving traffic. Engineers paused deployments, redirected connections and tested configuration changes while monitoring server stability.

Microsoft also began reversing a recent network configuration change to determine whether it contributed to the incident. The company reported no evidence of malicious activity but had not published a definitive root-cause assessment.

Microsoft Teams, Copilot and AI Connectors Also Experienced Problems

A separate Microsoft Teams outage affected messaging functions in North and South America earlier on November 12. Microsoft recorded that incident between 9:45 am and 10:53 am Eastern Time and confirmed that the affected functionality had been restored.

The Microsoft Teams outage was distinct from the larger disruption. During the later incident, core messaging and meetings generally remained available, but Exchange-dependent functions such as scheduling, calendars and certain chat operations experienced problems.

Microsoft 365 Copilot users also reported difficulty loading conversations or retrieving workplace information. The consequences extended to external AI platforms. OpenAI investigated failures involving Microsoft account connectors, while Anthropic reported problems with its Microsoft 365 integration. Those disruptions did not establish that ChatGPT or Claude had become universally unavailable.

Why the Global Disruption Matters for Indian Businesses

The global Microsoft outage exposed how closely corporate communications, scheduling and workplace automation depend on shared cloud infrastructure. Indian companies using Exchange Online, Outlook, Teams and Microsoft 365 Copilot could potentially experience interrupted email access, delayed meeting coordination and reduced access to connected work data.

However, no verified India-specific total of affected users has been released in the reporting reviewed. Global complaint figures should not be presented as a confirmed count of Indian customers.

Elsewhere, the impact was measurable. Japanese officials acknowledged disruption to government IT infrastructure, while public services in Australia's New South Wales reported operational difficulties. US electric-truck manufacturer Workhorse Group postponed its earnings announcement, citing the disruption. These examples illustrate why organisations need contingency arrangements for essential communications and cloud-based workflows.

When Will Microsoft 365 Services Return to Normal?

The November 12 Microsoft outage continued into Friday morning, with engineers testing traffic restrictions, server restarts and additional capacity measures. Microsoft reported marginal improvements but warned that recovery could be gradual. No confirmed worldwide restoration time had been announced in the service-health updates reviewed. For businesses, the incident highlights the importance of monitoring official service-health notices, retaining alternative communication channels and maintaining business-continuity procedures.

The immediate priority remains restoring stable access. The longer-term question is how Microsoft will prevent a failure in shared infrastructure from disrupting so many connected workplace services simultaneously.