Is Outlook down? Microsoft deploys fix to Office 365 outage affecting ...

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Microsoft confirms the reason behind global outage

Days after the global technical outage, Microsoft announced the root cause of the issue, confirming that it was a cyber attack.

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Editor's note: This story was updated to provide more information.

Thousands of users are reporting issues accessing Microsoft Outlook email as well as the tech giant's suite of Office 365 software on Monday.

Here's what's going on.

Is Microsoft down? Thousands report issues with Outlook, Microsoft 365 on Downdetector

Downdetector, which tracks website outages through reports submitted by users, was showing 8,707 outage reports for Outlook as of 12:30 p.m. and 5,387 user issues with Microsoft 365, formerly Office 365.

Microsoft deploys fix, monitors issues with Outlook, Microsoft 365

At around 9 a.m. Monday, Microsoft announced it was deploying a fix through its official Microsoft 365 Status account on X.

At around 11 a.m., Microsoft provided an update, saying the fix had reached about 90% of affected environments, and its targeted restarts were continuing.

Why is Microsoft 365, Outlook, Teams down?

On X, Microsoft said it was "investigating an issue impacting users attempting to access Exchange Online or functionality within Microsoft Teams calendar."

When will Microsoft 365, Outlook be back online?

As of 12:25 p.m., Microsoft said progress on the fix was moving slower than anticipated. The company did not have an ETA for a resolution.

What is an Outlook 503 error?

As part of the Outlook outage, users might see a 503 error. According to Microsoft, the error is given when the Outlook server is not available.