Key Highlights

  • A Microsoft (NASDAQ:MSFT) outage affecting Outlook, Teams and other Microsoft 365 services began on Thursday, November 12, 2026 in the Americas and went global within the hour.
  • Downdetector showed reports from 74 countries and territories in about an hour, and the disruption had stretched into Friday morning.
  • Microsoft said there is no indication of malicious or cyber activity, and that traffic rerouting and blocking brought only partial recovery.
  • The cause has not been confirmed, though one government minister said Microsoft believes it is dealing with something similar to the 2024 CrowdStrike incident, an update that has gone awry.

What Happened

The trouble began on Thursday in the Americas and spread within the hour. Downdetector logged a tenfold jump in reports in Britain at about 17:43 UTC, followed by surges in India and New Zealand. Outlook email, Teams and other Microsoft 365 services were affected, and the company said overnight that rerouting traffic and blocking certain flows had produced partial recovery but not a sustained fix. As of Friday morning there was no sustained recovery, which put the disruption past 12 hours. An executive responsible for the company's Copilot and platform Business said there is no indication it is the result of malicious activity and that engineers are working to address the issue. Microsoft has not published a root cause. The scale of the disruption is large because Teams and Outlook are central to daily work for hundreds of millions of people. Even partial outages interrupt scheduling, calendars and calls, and organizations that rely on cloud identity and email have limited Options for working around a failure.

Who Was Affected

Reports named a wide range of users: Australia's intelligence agency and federal police, Japanese ministries that returned to paper, the Philippine Supreme Court, Australian schools and courts, and US city governments including Miami Beach and Austin. A sheriff's office in Colorado, two Indian airlines and an electric vehicle maker that postponed its Earnings Call were also affected. Bankers in Hong Kong reported disruption. Several banks warned customers about scammers posing as technical support. The breadth shows how much of the business world depends on one provider for email and meetings, and it revives the debate about concentration risk in cloud and productivity software. The incident also drew attention from security teams, since criminals often use outages to launch Phishing campaigns. The warnings issued by several banks show how quickly attackers move to exploit confusion, and customers were told to rely only on verified channels for support. Companies that were hit have also begun to review whether they should keep backup communication channels, such as a second email gateway or an alternative meeting tool, so that a single failure does not stop operations for a full day.

What It Means for Investors

The shares of Microsoft fell on Wednesday as new AI office tools from a rival drew attention, and the outage adds a second headline for the stock heading into Friday. Short outages usually have limited effects on cloud contracts, which carry service credits, but a long and global disruption raises questions about reliability and could prompt enterprise customers to Demand stronger guarantees or multi vendor plans. Regulators in several countries are also watching dependence on a few providers. The financial effects will depend on duration, on any compensation, and on whether a software update was at fault. Microsoft remains a very large and profitable business with diversified Revenue from cloud infrastructure, software and gaming, so one outage is unlikely to change its financial outlook on its own. The lasting effect, if any, would come from policy responses and from enterprise buyers asking for greater resilience.

Where Things Stand

The next step is a confirmed fix and a published root cause analysis. Watch for service credits, customer complaints, regulatory statements and the reaction in the shares at Friday's open. A cause involving an update would revive scrutiny of how large providers test and roll out changes.