Outage over: Microsoft 365 web apps back online after almost 4 hours

We’re investigating an issue where some users may be unable to access Microsoft 365 apps for the web. We’re reviewing service monitoring telemetry to isolate the root cause and develop a remediation plan. For more information, please refer to OO953223 in the admin center.

— Microsoft 365 Status (@MSFT365Status) December 10, 2024

According to Downdetector, hundreds of users across the world have also confirmed that apps like Outlook, OneDrive and others are currently inaccessible. One user who goes by the name “Beech Hill School” posted that they are getting an error message that says “We’re experiencing a service outage. All of your open files have been saved. It may be some time before the outage is resolved.”

We’ve identified a token generation issue which may be contributing towards the impact. We’ve deployed a fix to disable proactive caching, which we believe will resolve the issue. For more information, please refer to OO953223 in the admin center.

— Microsoft 365 Status (@MSFT365Status) December 10, 2024

Microsoft may have acknowledged the issue on X (previously Twitter), but the company has yet to reflect the outage status on its Service Health page, where it says “Everything is up and running.” The outage started almost two hours ago, but it may take anywhere between a few minutes to hours before Microsoft 365 customers can start using web apps. A few minutes ago, the company said that they had deployed a fix, which may help resolve the issue.

Microsoft recently posted on X that the issue affecting its cloud subscription service has now been resolved and that 365 apps like Word, Excel, Teams and others should function normally.