How to Keep Your Business Running During a Microsoft 365 Outage
Last week, some of our clients felt it directly. On August 31, a Microsoft 365 outage disrupted email for a portion of users – not everyone, and not every mailbox even among the accounts it touched. Microsoft later said the cause was a misconfiguration in one of its own authentication components, the kind of internal plumbing most businesses never think about until it breaks.
It wasn’t a quick blip, either. Microsoft’s own updates described the outage as “gradually recovering” a full day after it started, with the company still running extended monitoring before calling it fully resolved. Outlook, Teams, and SharePoint were all affected to varying degrees.
None of this was caused by a hacker. It didn’t need to be. A misconfigured setting on Microsoft’s end did the damage. It left some businesses waiting on email they couldn’t send and files they couldn’t reach. Customers couldn’t get through either, and there was nothing on the client’s end to fix.
Why a Microsoft 365 Outage Is Worth Planning For
It’s tempting to treat this as a one-off. It isn’t. Big, reliable platforms go down more often than most businesses expect. Microsoft 365 has had its own multi-hour outages before. A faulty update from the security vendor CrowdStrike grounded flights and stopped hospital work back in July 2024. Being on a well-known platform doesn’t make you immune to its bad days.
Most small businesses run almost everything through a handful of cloud tools now – email, files, bookings, payments. When one of those goes down, whatever depends on it stops until the provider fixes it. That’s the part worth sitting with: you can’t patch it, restart it, or call someone to speed it up. You wait.
What an Outage Actually Does to a Small Business
When email or Teams goes down, your team can’t reach each other the way they normally would. If a booking or payment tool is affected, you can’t take money or appointments. Customers try to reach you and can’t, and you have no easy way to reach them back. People end up sitting around waiting on a system that isn’t coming back on its own timeline.
The goal of a plan isn’t to make the outage end faster. Nothing you do on your end will. The goal is to keep your team working and your customers informed while you wait it out.
What a Simple Continuity Plan Covers
You don’t need anything elaborate here – a single page, reviewed once or twice a year, covers most of it.
Know Which Tools You’d Actually Miss
List the handful of tools that would stop the business cold if they went down – probably email, and whatever you use for payments or bookings. Everything else is worth ignoring for planning purposes. If you could live without a tool for a day, it doesn’t belong on this list.
Have a Backup Way to Reach Each Other
Pick a way to stay in touch that doesn’t depend on the tool that’s down. Phone numbers work. Text works. If your business phone system includes chat functionality similar to Teams, that can work too – but only for staff who already have the app installed on a phone or computer. Finding out mid-outage that half the team never set it up defeats the purpose.
Keep Key Files Reachable Even When the Cloud Isn’t
This is where Microsoft 365 helps you, even during an outage of its own making. OneDrive syncs a local copy of your files to each device by default, so recently used documents stay reachable even when the cloud service itself is down. We sometimes adjust that default so files nobody’s opened in a while stop syncing locally. Most business laptops don’t have unlimited storage, and there’s no reason to keep a copy of something nobody’s touched in months. If you’re not sure your setup keeps the files you’d need, that’s a quick thing for us to check as part of Backup and Disaster Recovery.
Decide Who’s in Charge Before It Happens
Someone needs to own two decisions during an outage: what the team does instead, and what customers get told. Deciding this in advance means people act instead of waiting around for someone else to figure it out.
Know Where to Check
Bookmark Microsoft’s status page before you need it. It’s the fastest way to tell whether it’s a wider outage or just you, and that answer changes what you do next.
What to Do the Moment It Hits
- Check whether it’s just you. A wider outage means there’s nothing to fix on your end, so stop troubleshooting and start working around it.
- Tell your team what’s down and what to use instead, before someone wastes an hour rebooting a laptop that was never the problem.
- Switch to your backup way of communicating so the team can keep coordinating.
- Tell customers if it affects them, and give them a sense of when to try again.
- Note when it started and what it affected. A couple of lines is enough to help you follow up once things are back.
The Bottom Line
Last week’s outage didn’t need a hacker, a bad password, or a missed update. It just took a misconfigured setting on Microsoft’s own end, and that still left some of our clients waiting on email they couldn’t send. A one-page plan wouldn’t have brought Microsoft 365 back online any sooner. It would have kept the affected team talking, kept customers in the loop, and turned a stressful day into an inconvenient one.
Book a Free Consultation
Not sure your team has a plan for the next outage, whether it’s Microsoft’s or someone else’s? Let’s talk. Book a time on my calendar and we’ll look at what you depend on, as part of a broader Managed IT Services plan built for your business.
Frequently Asked Questions
No. Cloud platforms are reliable most of the time, but they still have real outages. Microsoft 365 has had its own multi-hour incidents, and the CrowdStrike outage in July 2024 took millions of computers offline in a few hours. It’s safer to plan for an outage eventually happening than to assume one won’t.
It depends on what’s affected, but options include opening files already synced to a device through OneDrive, switching to phone or text to stay in touch, and handling anything urgent on paper until service returns.
For files you’ve opened recently, generally yes – OneDrive syncs a local copy to the device by default, so it’s reachable even when the cloud service itself is down. Older files you haven’t touched in a while may stop syncing locally, since that saves disk space on the device. Worth checking with your IT provider whether your setup keeps what you’d need available.
That’s a different problem than a Microsoft 365 outage. There, your internet connection itself would be down, not just one service running on it. A mobile hotspot from a phone can get a few key people online for a little while. It’s not something to build a plan around for the whole team. The real fix is a backup internet connection that can take over automatically if your primary one drops. Keep important contacts somewhere that doesn’t need the internet to look up.
There’s no fixed answer. Some clear up in minutes; last week’s ran for more than a day before Microsoft called it fully resolved. That unpredictability is the actual reason to plan around outages instead of just waiting them out each time.
Partly, and it depends on planning ahead. We like to get to know how our clients run their businesses. That’s part of what lets us suggest ways to reduce the impact when something goes down. But that groundwork has to happen before an outage, not during one. If your internet goes down, there isn’t time to get a backup connection installed before the issue is resolved. Your IT provider can help you plan for that, but only if it happens ahead of time.
