Why Outlook Is Down: What We Know About Microsoft’s 365 Outage

Last updated: 13 November 2026, Eary Morning in IST. Based on Microsoft updates and reports available up to about 2:00 pm IST.

If you are searching for why Outlook is down, the short answer is that the fault sits on Microsoft’s side, not on your phone, laptop or Wi-Fi.

A large Microsoft 365 disruption, centred on Exchange Online (the email engine behind Outlook), began on Thursday evening US time. Users have reported failed logins, inboxes that will not load and mail that will not send. The trouble has also touched Teams calendars, Copilot and other services.

Microsoft has not confirmed a root cause or a full-recovery time. Here is what is verified, what is not, and what you can do in the meantime.

Quick summary: known vs unknown

• Confirmed by Microsoft: a number of servers became unexpectedly unavailable, straining the rest of the infrastructure. Recovery is under way but incomplete.
• Officially stated: a Microsoft executive says there is no indication of malicious or cyber activity.
• Still unknown: why the servers became unavailable, and when full service returns.
• Unverified: social-media theories about a cyberattack or rogue AI models.

Why Is Outlook Down Today?

Microsoft first said it was investigating problems reaching Exchange Online mailboxes through multiple connection methods in the Americas (ABC News, The Federal). It later confirmed the problem could affect Microsoft 365 connectivity for users in any region (AFP via Manila Times).

The company’s early explanation was “elevated load” on part of its infrastructure. It then corrected course: the strain was not caused by a traffic surge, but by a number of servers being unexpectedly unavailable, which pushed work onto the servers still running (Microsoft 365 Status on X).

In plain English: Microsoft’s servers run automatic “health checks”, quick self-tests that tell the system whether a machine is safe to send traffic to. Reports say many servers failed these checks and were pulled out of service (ITdaily). With fewer machines left, the remaining ones buckled.

Later, Microsoft said a core process on the affected servers was being overwhelmed, causing a loss of capacity (Microsoft 365 Status on X). Other outlets describe it as a process that sets up secure connections (CIO&Leader).

Microsoft also said it was assessing whether reverting a small number of recent configuration updates could speed recovery. That is a lead, not a finding. No root cause has been confirmed, and Microsoft says it will publish a post-incident report once the disruption is mitigated (CNN).

What Happened to Microsoft Outlook on November 13, 2026?

The outage began on Thursday 12 November (US time) and ran into Friday 13 November. Times below are shown in US Eastern Time (ET), UTC and India Standard Time (IST) where the source gives them.

• Thu 12 Nov, about 1:00 pm ET (6:00 pm UTC / 11:30 pm IST): Microsoft says it is investigating Exchange Online mailbox access problems in the Americas. Downdetector shows nearly 130,000 Outlook problem reports shortly .
• Thursday afternoon, ET: Microsoft widens the warning to any region, pauses deployments, moves traffic off affected infrastructure and restarts servers.
• Thursday afternoon to evening, ET: Microsoft finds the strain comes from unavailable servers, not extra traffic. It validates an alternative health-check method that lets some servers return (Microsoft 365 Status on X).
• Thursday, about 6:00 pm ET (11:00 pm UTC / 4:30 am IST Fri): Microsoft says a portion of servers are back and stable so far (ABC News). It later warns they can become unresponsive again once traffic returns, and temporarily limits some traffic types (Microsoft 365 Status on X).
• Late Thursday, ET: Microsoft reports positive results restarting infrastructure in isolated sections (Microsoft 365 Status on X), then says some changes are not taking effect as expected (Microsoft 365 Status on X).
• Fri 13 Nov, 11:25 am IST (5:55 am UTC): Microsoft reports partial recovery across regions (ABC7).
• Fri 13 Nov, 7:18 am IST update: some capacity restored in India; a fix is being tested on a small group of machines, and a recent network-settings change is being reversed, per Open Magazine.
• Fri 13 Nov, 2:00 pm IST: partial recovery for some users, with no confirmed full restoration and no estimated time (Smartprix).

Note: the ET times for the Thursday-evening posts are approximate, because the sources describe the sequence without exact clock times.

Which Microsoft Services Are Affected?

Exchange Online is the centre of the problem. Anything that depends on it can break, even if the app looks unrelated.

Confirmed or widely reported as affected

• Outlook and Exchange Online: mailbox access, sending and receiving.
• Microsoft Teams: calendars and meeting scheduling were hit, while core Teams messaging largely kept working (CIO&Leader).
• SharePoint Online and Microsoft 365 Copilot: listed among affected services (CybersecurityNews).
• Defender XDR: also listed as potentially affected (WindowsForum).

Partial or dependent-service disruption

• Microsoft said parts of services that do not rely on Exchange Online remained functional. Problems appear where a service needs mailbox or email data.
• Techzine reports that OneDrive was also affected (Techzine), but I could not find OneDrive in the Microsoft incident details reviewed.

Not confirmed

• Word and Excel were not named as affected in the incident details reviewed. If a file will not open, check whether it needs a Microsoft 365 sign-in or a mailbox-linked feature.

The effects spread beyond Microsoft’s own apps. Air India said it was monitoring the outage and rerouting emails while flight operations stayed unaffected (CNN). Government bodies in Australia were also disrupted (ABC Australia).

Is the Microsoft Outlook Outage Caused by a Cyberattack?

Microsoft’s official position: Charles Lamanna, Microsoft’s executive vice-president for Copilot, Agents and Platform, said there is no indication the disruption was caused by malicious activity or a cyberattack (The Federal). Microsoft told Australia’s Home Affairs Minister the same, and the country’s National Cyber Security Coordinator is aware of the outage (ABC Australia).

What is unverified: posts claiming a hack or rogue AI models have circulated widely. Times of India’s headline on the topic notes Lamanna addressed what has not likely caused the outage. I found no evidence supporting those theories, and no threat actor has been reported as claiming responsibility.

A fair caveat: “no indication” describes what Microsoft knows today. The final word will come in the post-incident report.

Is Outlook Working Now? Latest Microsoft Outage Status

Short answer: partly. Recovery is real but uneven.

• Microsoft reported partial recovery across regions on Friday and said users may see gradual improvement as clients reconnect (Microsoft 365 Status on X).
• In India, as of 2:00 pm IST on 13 November, Outlook was still disrupted for many users. Moneycontrol found both Outlook on the web and the desktop app largely inaccessible for affected users, per Smartprix.
• Downdetector reports from India peaked near 4,000 around 10 am IST and eased to 2,634 by 12:07 pm IST, still above normal (same source). These are user reports, not a count of affected people.
• Two incident records remained open: EX1550543 (Exchange Online) and MO1550821 (wider Microsoft 365).

A working inbox does not prove the outage is over. Services can recover and fail again while servers take on traffic.

When Will Microsoft Outlook Be Fixed?

Microsoft has not announced a confirmed restoration time. Reports as of Friday afternoon IST say there is no estimated time for full recovery.

What Microsoft has said it is doing:

• Rolling out a validated alternative health-check method more widely.
• Preparing automated systems to detect and restart unresponsive servers (Microsoft 365 Status on X).
• Testing a configuration change on a subset of servers before wider rollout.

Anyone quoting an exact fix time is guessing. The best signals are your Microsoft 365 admin center (incidents EX1550543 and MO1550821) and status.cloud.microsoft.

What Can Outlook Users Do During the Outage?

No setting on your device can fix a server-side outage. These steps can still save you time and stress.

1. Check Microsoft’s service health. Admins can use the Microsoft 365 admin center. Everyone else can use status.cloud.microsoft or the @MSFT365Status account on X.
2. Rule out your own connection. Try mobile data or another network. If other websites load, the problem is almost certainly not your internet.
3. Try another Outlook route, with low expectations. Outlook on the web, desktop and mobile were all reported unreliable for affected users, though some people reconnected as capacity returned.
4. Use another channel for urgent messages. Phone, SMS, WhatsApp or a non-Microsoft email account.
5. Do not reset passwords, reinstall Outlook or delete your profile. These steps are unlikely to fix an infrastructure outage (Techgenyz) and can create new problems.
6. Check for delayed mail after recovery. Look in your Inbox, Junk and Sent folders, and ask important senders to resend if something is missing.

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Pros and Cons of Relying on Cloud Email After This Outage

This outage is a useful reminder of what hosted email like Exchange Online gives you, and what it costs.

Pros

• No server upkeep for you. Microsoft runs the infrastructure, patches and capacity.
• Access from anywhere. One account works across web, desktop and mobile when service is healthy.
• Deep integration. Email, calendar, Teams and Copilot work together.
• Transparency after incidents. Microsoft has said it will publish a post-incident report with root cause and repair items.
• Scale and resources. Microsoft can restart, reroute and roll back changes across a global fleet.

Cons

• Single point of failure. When Exchange Online faltered, calendars, Copilot and security tools were hit too.
• You cannot fix it yourself. Admins and users can only wait for the vendor.
• Slow or uncertain recovery. This outage ran past 12 hours with no estimated time.
• Admin tools may fail too. Microsoft pointed users to its public status page in case the admin center was unavailable.
• Business-continuity risk. Customer service, schools and public offices reported knock-on disruption.

Practical takeaway: keep a backup communication channel and a documented outage plan, especially for client-facing work.