The November 2026 Microsoft 365 outage: what happened, and how to keep email running

Problems with Exchange Online mailboxes started on Thursday 12 November 2026 and spread across Microsoft 365. Microsoft listed Exchange Online (Outlook email), Microsoft Teams, SharePoint Online, Microsoft 365 Copilot and Defender XDR among the affected services, under incidents EX1550543 and MO1550821 in the Microsoft 365 admin centre. Downdetector logged more than 130,000 Outlook problem reports at the peak, according to Reuters.

Microsoft's own explanation, posted on its Microsoft 365 Status account, was that the elevated load "isn't driven by an increase in traffic, but by a number of servers being unexpectedly unavailable", which strained the remaining infrastructure. A Microsoft executive told Reuters the outage did not appear to be the result of a cyberattack.

Through Thursday night and Friday, Microsoft reported returning servers to service, limiting some kinds of traffic and gradual, partial recovery across regions. At the time of writing, on Friday 13 November, the outage was not yet fully resolved.

Our customers on Microsoft 365 in all three countries were affected: email would not send or arrive, and Teams calls and chats failed. Khaleej Times and Gulf News reported residents and businesses across the UAE unable to open mailboxes, send email or reach their documents.

Timing softened the blow for some. The outage began after working hours on Thursday, and Friday is a weekend day for most companies in Oman and Qatar. In the UAE, Friday is a working day for many businesses, and several of our UAE customers told us the outage cost them business: approvals, orders and customer replies all wait when email and chat stop at the same time.

The effect also reached beyond Microsoft's own apps. Reuters reported that the outage hit the Microsoft 365 connectors used by OpenAI's and Anthropic's AI services, and OpenAI's status page logged elevated errors on its Microsoft 365 connector. ChatGPT and Claude kept running; what failed was their link to Outlook, Teams and SharePoint. Today, many tools depend on the same few platforms, so one outage can stop several of them at once.

Yes. Every large cloud provider has had serious outages in the last two years, and none of them is immune:

Every cloud service has outages. What decides the cost is whether your business has a plan for the hours it is down. That is why we recommend a multi-vendor approach to continuity, disaster recovery and security, whichever platform you run on.

• Amazon Web Services, October 2025: an issue in DynamoDB's DNS management in AWS's us-east-1 region disrupted websites and apps worldwide for most of a day, according to AWS's own summary.
• Amazon Web Services Middle East, March 2026: AWS reported that an Availability Zone in its UAE region "was impacted by objects that struck the data center, creating sparks and fire", and services in the UAE and Bahrain regions were disrupted.
• Google Cloud, June 2025: a failure in Google's Service Control system disrupted Google Cloud and services built on it for several hours, according to Google's incident report.
• Cloudflare, November 2025: a change to database permissions broke a file used by its bot protection, and many websites that rely on Cloudflare failed to load; Cloudflare said it was not an attack.
• CrowdStrike, July 2024: a content update from a third-party security vendor affected about 8.5 million Windows computers, Microsoft estimated.

Work through these in order. None of them needs a technician.

1. 1

   Check the real status

   IT admins can see Microsoft's updates in the Microsoft 365 admin centre, Service health. Everyone else can check the public Microsoft 365 status page and the Microsoft 365 Status account on X. If Microsoft lists an incident, the problem is not on your side.

2. 2

   Don't change email settings in a panic

   changing MX records, passwords or mail routing during an outage rarely helps and can lose mail. Email sent to you is normally held and retried by the sending server, and arrives when the service recovers.

3. 3

   Switch to another channel you already use

   phone, WhatsApp, Google Meet or Zoom for urgent conversations, with a short list of key contacts kept outside email.

4. 4

   Tell your team and your customers

   one message from management saying email is affected, which channel to use instead, and when you will update them next.

5. 5

   Raise your guard against scams

   outages are a gift to attackers. Read the next section before acting on any unusual request.

6. 6

   Write down what stopped

   note which tasks could not be done and for how long. It is the best input for your continuity plan.

When email stops, people move to WhatsApp, personal mailboxes and phone calls they would not normally use. Attackers know this, and outages bring a wave of impersonation:

Agree these rules with your team now:

• CEO and finance fraud: "Email is down, please process this payment today, I'll explain later", sent from a new WhatsApp number or a personal email address.
• Fake IT support: a call or message asking for your password or the code from your authenticator app to "restore your mailbox".
• Fake Microsoft pages: links to a "Microsoft 365 recovery" or sign-in page that steals the password you type.
• Changed bank details: a supplier "contact" asking you to pay into a new account because their email is down.
• Verify by calling back: any new address, number or payment request is checked by calling a number you already have, not one given in the message.
• Never share sign-in codes: Microsoft and your IT team will never ask for your password or authentication code.
• Bookmark the real status page: open status pages from a saved bookmark, not from a link someone sends you.
• Slow down payments: no new beneficiary and no changed bank details until email is back and the change is confirmed.

There are three levels of protection. Most businesses need the first; companies that cannot afford a day without email need the second or the third.

1. A communication plan (free). Decide in advance which channel replaces email and chat during an outage, who tells staff and customers, and keep key contacts outside email. Have a second meeting and chat tool your team already knows: Google Meet and Google Chat, Zoom, or WhatsApp Business. If staff have never used it, they will not find it during an outage.

2. Dual delivery to a standby mailbox (our quick fix). Every email keeps reaching your normal mailbox as it does today. At the same time, a copy of every message for your key people (management, sales, finance, customer service) is delivered to a standby mailbox on Zoho Workplace or Google Workspace. On a normal day nobody uses the standby. During an outage, those people sign in to the standby, where their recent mail is already waiting, and keep replying from the same address. When the main service recovers, the mail it missed is delivered to it.

Where the copy is made matters. A forwarding rule inside your main mail service stops working when that service is down, so we set up the mail route so that both copies are made before the main service: Google Workspace and Zoho Mail both support dual delivery. We use dual delivery only, never split delivery: split delivery moves some users' mail to the second system instead of copying it, so it does not protect the main mailbox at all. Dual delivery is cost-optimised, because only key people need a standby mailbox; ask us for a price.

3. Mimecast Continuity (the most reliable). Mimecast runs on infrastructure separate from your mail platform. When the main service goes down, Mimecast says employees continue to send and receive email and use their calendars through Outlook, mobile, web and Mac apps. Mimecast's published customer stories include Al Abbar Group in Dubai and Grant Thornton, both of which chose Mimecast to keep email running through outages. It works with Microsoft 365, Google Workspace and Exchange; setup is as fast as your requirements allow, and pricing is on request.

See our email continuity service for how each option is set up and tested.

Most companies start with a plan and dual delivery for key people, and move to Mimecast Continuity when email is critical for everyone.

Yes, for most businesses. Microsoft 365 remains a reliable and secure platform, as do Google Workspace and Zoho Workplace; each has had outages, and each will have more. Moving platforms does not remove the risk, it moves it. The lesson of this week is not to choose a different single vendor, but to stop depending on any single vendor for everything: a second channel for communication, a standby for email, and backups held outside the main platform.

As a Microsoft Solutions Partner for Modern Work, a Google Cloud Premier Partner and a Zoho Authorized Partner, we help customers in Oman, the UAE and Qatar build exactly this kind of multi-vendor setup.

Once the service is fully restored, Microsoft publishes a post-incident review for affected customers in the Service health section of the admin centre. Microsoft's service description says the final review follows within five business days of resolution. We will update this post with Microsoft's findings when they are available.