Microsoft Outage: What Happened to Outlook, Teams and Copilot, and What Brands Should Do

A global Microsoft outage that began on Thursday 12 November, early afternoon US Eastern time, has knocked out Outlook and Exchange Online email for users in dozens of countries and disrupted parts of Teams, SharePoint and Microsoft 365 Copilot. As of Friday 13 November, Microsoft reports partial recovery, but the outage is not fully resolved and Microsoft has not published a root cause. For marketing and comms teams, the bigger lesson is what happens to customer contact when one platform carries most of it.

What happened in the Microsoft outage?

Users started reporting that they could not reach Outlook on Thursday afternoon US Eastern time. Microsoft first said it was investigating problems accessing Exchange Online mailboxes, initially in the Americas, then warned the issue "may impact Microsoft 365 service connectivity for users in any region".

The problem spread quickly. According to Al Jazeera, Downdetector had reports from 74 countries and territories within about an hour. More than 12 hours in, Microsoft's status page described only "marginal success".

Microsoft outage timeline

Times are as reported by Microsoft and news outlets.

• Thu 12 Nov, early afternoon ET: Outlook reports spike. TechRadar recorded more than 131,000 Downdetector reports at the peak.
• Thu 19:19 UTC: Microsoft confirms it is investigating Exchange Online mailbox access issues.
• Thu 19:57 UTC: Microsoft tests a configuration change for servers failing automated health checks.
• Thu 20:35 UTC: Microsoft says it has not identified any recent change linked to the start of the problem.
• Thu 20:59 UTC: An alternative health check method lets some servers return to service.
• Thu ~6pm ET: Returned servers are stable at first, but Microsoft later says they can become unresponsive again once they take traffic.
• Fri ~07:00 GMT: About 43,000 Outlook reports from 72 countries as Europe starts work.
• Fri 09:05 UTC: Microsoft says it is not aware of any malicious activity behind the incident.
• Fri 09:16 UTC: Capacity still below normal. Microsoft extends the email timeout window to 48 hours so delayed messages are not lost.
• Fri 11:41 UTC: "Additional progress toward recovery", though "some intermittent issues may continue". US Outlook reports climb back above 20,000.

Which Microsoft services are affected?

Outlook and Exchange Online were the core of the problem, across web, desktop and mobile. Some emails that did get through arrived late.

Microsoft's status page also listed these as affected or potentially affected:

• Microsoft Teams (Microsoft said mitigation restored service health; Al Jazeera reports chats and calls largely kept working)
• SharePoint Online
• Microsoft 365 Copilot
• Microsoft Defender XDR

There were also reports of OneDrive problems. SecurityWeek reported that some Google Workspace users could not reach their Google-hosted mail through the Outlook desktop and mobile apps. OpenAI and Anthropic reported problems with their own tools linked to third-party integrations.

What caused the outage?

Microsoft has not given a root cause yet. Its account so far:

1. A large number of servers became unexpectedly unavailable, shifting load onto the rest of the infrastructure. Microsoft says the extra load "isn't driven by an increase in traffic".
2. Affected servers failed automated health checks after a core process became overwhelmed. Microsoft also looked at elevated processor usage.
3. Traffic moved to healthy servers, overloading them. Servers that came back were swamped and failed again.

Microsoft paused deployments and configuration changes, moved traffic and restarted servers. On Friday it said it was rolling back a network change, but it did not say that change caused the problem.

Microsoft says this was not a cyberattack. Charles Lamanna, Microsoft's EVP for Copilot, Agents and Platform, posted on X that "there is no indication this is the result of malicious or cyber activity."

Who was hit?

The outage reached well beyond office inboxes:

• Governments: Singapore's Government Technology Agency, Japan's internal administrative system, Australia's domestic intelligence agency and federal police, and New Zealand's foreign ministry. Immigration New Zealand moved digital visa processing to manual.
• Airlines: Flights ran normally, but IndiGo and Akasa Air email customer-service helplines went offline. Malaysia Airlines had intermittent email failures and Emirates had hitches with customer correspondence.
• Healthcare: Unity Health Toronto declared a Code Grey after staff lost email. Clinical care was unaffected and urgent callers were told to phone switchboards.
• Finance and education: Japan's Credit Saison warned of delayed responses, banks in Singapore reported interruptions, and Waseda and Kyushu universities reported delays.

Microsoft 365 has more than 430 million users, according to Proactive via Yahoo Finance. Microsoft has not said how many were affected.

Is Outlook still down? How to check status

As of Friday 13 November, service is partly restored, intermittent problems continue and there is no timeline for full recovery. To check:

• The Microsoft 365 Status account on X (@MSFT365Status)
• The service health page in the Microsoft 365 admin center. Admins should look for incident IDs EX1550543 (Exchange Online) and MO1550821 (wider Microsoft 365).
• Downdetector, which shows user reports. It only counts people who visit the site, so the real number affected is higher.

What should marketing and comms teams do during a platform outage?

Walter Pasquarelli of the University of Cambridge told Al Jazeera: "What we do know so far is that this is first and foremost a communication risk." That puts the response squarely with marketing and comms.

1. Tell customers before they ask

If your support inbox runs on the affected platform, customers will not know their emails are bouncing or sitting in a queue. Post a short notice on your website, social channels and app: what is affected, how to reach you instead, and when you will update next. Unity Health Toronto kept its message simple: urgent callers were told to phone switchboards.

2. Check scheduled campaigns and email sends

Review everything due to go out in the next 24 to 48 hours:

• Pause sends that ask for an email reply or route replies to an affected inbox.
• Hold upbeat promotional sends to audiences who may be dealing with disruption. Tone matters.
• Check internal approvals. If sign-off happens over Outlook or Teams, launches can stall quietly.
• Expect late replies. Microsoft extended its email timeout window to 48 hours, so delayed messages may arrive in a batch once service returns.

3. Set up a backup channel now

The airlines show the gap. IndiGo and Akasa Air kept flying, but their email helplines went dark. Every brand should have at least one customer contact route that does not depend on its main productivity suite: a phone line, a web form on separate infrastructure, live chat, or a staffed social inbox. Write down who switches it on and how.

4. Watch what competitors do

Air India used the moment to advertise flights on social media while other carriers dealt with email failures. Whether you see that as smart or opportunistic, it shows that rivals move fast when attention shifts. MarkGrid's Competitive Intel monitors competitors' content, SEO and AI citations in real time, so teams can see when a rival changes its messaging during a disruption rather than finding out a week later.

5. Keep holding statements ready

Draft short templates in advance for "our email is down", "responses are delayed" and "service is restored". Store them somewhere you can reach without the affected platform. Teams using MarkGrid's Content Engine can draft on-brand versions from a brief and get them approved ahead of time.

6. Check what AI assistants are saying

When an outage hits, customers increasingly ask AI assistants whether a service is down or how to contact a company. If those answers point to an email address that is not working, customers hit a dead end. MarkGrid's Model Share tracks how brands appear in AI answers, and its GEO guide explains how brands can make accurate information, such as alternative contact routes, easier for those systems to find.

Frequently Asked Questions

Was the Microsoft outage a cyberattack?

No, according to Microsoft. It said on Friday it was not aware of any malicious activity causing the incident, and Charles Lamanna said there was no indication of malicious or cyber activity.

When will Outlook be fully fixed?

Microsoft has not given a timeline. As of Friday 13 November it reported progress toward recovery but warned intermittent issues may continue.

Will I lose emails sent during the outage?

Microsoft extended its email timeout window to 48 hours to protect delayed messages. Some messages may arrive late rather than not at all.

Is this related to Patch Tuesday?

There is no known link. The outage came two days after November's Patch Tuesday, but Microsoft has not linked the two. It said it had not identified a recent change linked to the start of the problem, and it will publish the root cause once the issue is fixed.

Has Microsoft had outages like this before?

Yes. Earlier in 2026 there was a Microsoft 365 outage in North America lasting almost 10 hours, and an Outlook lockout in late August.