Microsoft 365 or Outlook Down? What To Do, and How To Stay Working

Your email has just stopped. Outlook keeps asking for your password, or the inbox simply spins and nothing arrives. Before you reinstall anything, or start worrying that you have been hacked, take a breath. Most of the time this is not your laptop and not your fault, and there are a handful of sensible things to do.

Does any of this sound like you right now?

• Outlook will not connect, or keeps asking you to sign in again and again?
• Teams messages are not sending, or meetings have vanished from the calendar?
• Worried that emails are being lost while you cannot get in?
• Not sure whether to blame your laptop, your broadband, or Microsoft?

If so, here is what to do, in order.

First, check whether it is actually down (and not just you)

Five minutes here saves an afternoon of chasing a fault that was never yours.

• status.cloud.microsoft is Microsoft’s own public health page. If Microsoft is having a bad day, it will say so here.
• Microsoft 365 admin centre, Service Health. If you are an administrator, this shows whether your organisation is affected and gives an incident reference to follow.
• A quick sanity check. If colleagues and half the country have the same problem at the same moment, it is the service, not you.

What not to do (this is the important bit)

When email dies, the temptation is to start pulling things apart. Please do not. During a Microsoft-side outage, none of the following helps, and some of it quietly creates a second problem for when the service comes back:

• Do not reinstall Office or the Microsoft 365 apps.
• Do not delete and recreate your Outlook profile.
• Do not reset everyone’s passwords.
• Do not rebuild or move mailboxes.

If it is down for Microsoft, it is down whatever you click. Leave it be.

What you can do right now

• Try a different door. If desktop Outlook is stuck, try Outlook on the web, or the app on your phone, and the other way round. Sometimes one route works when another does not.
• Switch the channel. Pick up the phone, send a text, use mobiles, or a chat tool that does not run on Microsoft 365. Tell your team and your key clients what is happening on something that still works.
• Stop worrying about lost email. When someone emails you and your server cannot take it, their system normally keeps trying for hours, and often for a day or two, before giving up. Delayed is not the same as lost. Most of it lands once service returns.
• Make a quick note of what you could not do and when, so you can pick it back up cleanly and learn from it afterwards.

Which of those would actually keep your day moving?

How to make sure it hurts less next time

This is the part worth ten minutes when the dust settles. Outages like this happen several times a year, and you cannot stop Microsoft having a wobble. You can stop it stopping your business.

• Email continuity. A continuity service holds your incoming email safely and gives your team an emergency webmail to keep reading and sending while Exchange is down. This is the single biggest difference between a lost afternoon and barely noticing.
• An agreed plan B for talking to each other. A simple, written fallback, covering which chat tool, which phone numbers, and who tells the clients, that your team already knows. A plan nobody has seen is not a plan.
• Early warning. Service-health alerts sent to an address that is not on Microsoft 365, so you still get them when Microsoft is down, plus monitoring that tells you before your staff do.
• A quick word on backup. Backing up Microsoft 365 is important, but be clear on what it is for: it protects you from deleted or ransomwared data, not from an outage. An outage is a continuity problem; data loss is a backup problem. You want both covered, because they are different jobs. Our business continuity guide walks through both.
• Someone to call. A managed IT partner who is already watching, already has continuity in place, and can tell you in one sentence whether it is you or Microsoft.

Frequently asked questions

Is Microsoft 365 being hacked when it goes down?
Usually not. Most big outages are internal faults, not attacks. In the November 2026 outage, Microsoft said there was no sign of malicious activity.

Will I lose the emails people sent while it was down?
Usually no. They are delayed, not lost, because sending mail servers keep retrying. An email continuity service removes the doubt entirely by holding them for you.

How often does this really happen?
Often enough to plan for. Microsoft 365 has had several notable incidents across 2026 alone. That is the case for a plan, not a panic.

What can you do that Microsoft cannot?
We cannot fix Microsoft’s servers. We can make sure a Microsoft bad day is a minor inconvenience for you rather than a lost day: continuity, monitoring, a clear plan, and a human who answers the phone.

Keep working, whatever Microsoft is doing

If your team keeps grinding to a halt every time Microsoft sneezes, let us look at your setup and put the right safety nets in place. We are a UKAS ISO/IEC 27001:2022 Certified, Microsoft Solutions Partner and Cyber Essentials Practitioners, supporting UK businesses since 2006.

Prefer to talk to a human first? Call us on 01452 701355, or drop us a line. Business enquiries only, no obligation.

Related reading: When email goes down, who’s still watching your IT? Why your monitoring should not depend on the channel that just failed.