Microsoft’s email and chat services went down for hours, and many people around the world could not open their inboxes. The company now says it is “not aware of any malicious activity” behind the Outlook outage. The problem hit Outlook and Teams, and it affected businesses and government offices. Here is what happened, what Microsoft says caused it, and what comes next, in simple words.
What Happened?
Outlook and Teams were disrupted for about 10 hours as Microsoft struggled to fix problems with some of its servers. Problems were reported from Thursday, November 12 in the United States and carried into early Friday, November 13 in Asia and the Pacific. According to Reuters and AFP, businesses and government agencies that rely on these tools were hit around the world.
Microsoft said the features of Microsoft 365 that depend on Exchange Online and email were affected. Exchange Online is Microsoft’s cloud system that delivers email, calendar, contacts, and tasks. Features that do not rely on Exchange Online kept working.
How Big Was It?
| Measure | What Downdetector Showed |
|---|---|
| Peak in the US (about 1 p.m. ET Thursday) | More than 130,000 reports of Outlook problems |
| 9:30 p.m. ET Thursday | More than 25,000 reports in the US |
| Asia-Pacific (early Friday local time) | Outages for several Microsoft services, including in India, Australia, and Japan |
Downdetector collects user reports of problems, so the numbers show how many people said they had trouble, not the exact number of affected users.
What Microsoft Says
Microsoft said it was not aware of any malicious activity causing the incident, and that it would keep treating it with urgency until it was fully fixed.
The company gave these updates during the outage:
- A number of servers were unexpectedly unavailable, and this was not caused by an increase in traffic.
- Servers that had been restored stayed stable, and Microsoft was moving traffic to other routes where possible.
- As capacity returned, users might see a gradual recovery as their programs reconnected.
- At 6 p.m. ET it had seen limited recovery as users slowly reconnected.
- In its latest update, it said efforts to improve serviceability were not going as expected, and it was looking for other ways to add capacity because of “sustained traffic management imbalances”.
Was It a Cyberattack?
Microsoft says it knows of no malicious activity. Australia’s Home Affairs and Cyber Security Minister Tony Burke said at a press conference that Microsoft believes it is not dealing with a cyberattack. He compared it in some ways to the 2024 CrowdStrike problem, where a software update went wrong. He said the impact was mostly on email systems. These are Microsoft’s and the minister’s current views, and the company has not yet shared a final cause.
The 2024 CrowdStrike failure was one of the largest internet disruptions ever. It hurt computer systems in hospitals, banks, and airports.
Who Was Affected?
- Government bodies: Australia’s spy agency and federal police were among the groups caught up in the outage. The US House of Representatives said its users were affected, and its engineers were working with Microsoft.
- Businesses: Electric truck maker Workhorse Group delayed its third-quarter results from November 12 to November 16, citing business disruptions from the global Microsoft outage.
- Other tech companies: OpenAI said it was investigating a problem with Microsoft connectors, where new connections might not work. Anthropic said it had found an issue with an upstream provider affecting its Microsoft 365 connector.
Not the First Problem
Last month, Microsoft reported an outage of its Azure cloud platform. That outage affected the company’s productivity software and many industries around the world. Two serious disruptions in a few weeks are likely to raise questions about how much people and governments depend on one provider for email and work tools.
What You Can Do If You Use Outlook or Teams
- Check Microsoft’s service status page or its official Microsoft 365 status account for updates, instead of relying on rumours.
- For urgent messages, use another channel, such as a phone call or text message.
- Do not click links in unexpected emails about the outage. Scammers often use big outages to send fake messages.
- Be patient when service returns. Microsoft says recovery may be gradual as programs reconnect.
- If you manage a business, plan a backup way to contact customers and staff.
What to Watch Next
- Whether Microsoft fully restores Exchange Online and explains the root cause
- Whether the problem turns out to be an update or a server fault
- Whether companies and governments ask for more details or compensation
Frequently Asked Questions
What caused the Outlook outage?
Microsoft has not shared a final cause. It said some servers were unexpectedly unavailable and that it was working to restore capacity.
Was it a hack?
Microsoft says it is not aware of any malicious activity. Australia’s cyber security minister said Microsoft believes it is not a cyberattack.
Which services were affected?
Outlook, Teams, and other Microsoft 365 features that depend on Exchange Online. Parts that do not rely on Exchange Online kept working.
How long did it last?
About 10 hours, according to reports, with a gradual recovery afterwards.
Is it fixed now?
Check Microsoft’s service status. The latest update said recovery was limited and that its first efforts were not progressing as expected.
The Outlook outage shows how many people depend on a few cloud services for daily work. Microsoft says it sees no sign of an attack, and the next step is a full fix and a clear explanation.
