Microsoft 365 outage affects Exchange Online, Teams, Sharepoint

Microsoft is working to fix an ongoing and widespread Microsoft 365 outage that affects multiple services and features, including Exchange Online, Microsoft Teams, and SharePoint Online.

Since this outage started about six hours ago, Downdetector has been doing it received thousands of reports where affected users say they are also experiencing problems connecting to other services such as OneDrive, Purview, Copilot and Outlook Web and Desktop.

“We are investigating an issue affecting users trying to access Exchange Online or Microsoft Teams calendar functionality. For more information, please refer to MO941162 in the admin center,” the company said when it acknowledged the problems 6 hours ago.

“While we continue to work to address the issue, we have added a comprehensive list of affected services and scenarios to the more information section.”

In the admin center incident report, Microsoft confirmed that the outage prevents customers from accessing Exchange Online via Outlook on the web, Outlook desktop client, Representational State Transfer (REST), and Exchange ActiveSync (EAS).

The company also says that some customers may have problems performing actions in Microsoft Fabric, Microsoft Bookings and Microsoft Defender for Office365.

While Remond has only said that the outage was caused by a “recent change,” the company has already implemented a fix on the affected infrastructure, rebooted affected systems, and is monitoring the situation.

“We have begun implementing the fix, which is currently progressing through the affected environment. While this is progressing, we are beginning manual reboots on a subset of machines that are in an unhealthy state,” Microsoft said an hour ago.

“We are monitoring the progress of the fix, which has been deployed to approximately 60% of affected environments. We are continuing our manual reboot on the remaining affected machines.”

Microsoft’s Office service health and that Microsoft 365 network health status pages currently show no issues with company network status and availability, ISP availability, and customer network infrastructure.

In July, another worldwide outage took down several Microsoft 365 and Azure services, including the admin center, Intune, Entra, Power BI, and Power Platform services.

A day later, the company admitted that the nine-hour outage was triggered by a distributed denial-of-service (DDoS) attack.