Updated on Thursday, Nov. 12 at 3:55 p.m. ET — Updated with more details revealed by Microsoft.
Starting in the early afternoon, Microsoft 365 enterprise software products experienced a major outage, which is ongoing at the time of publication. On the platform DownDetector, more than 100,000 users reported problems with Outlook alone.
The company has posted regular updates about the situation, both on social media and on its website.
On the company's official status page (which also went offline briefly, according to multiple Mashable reporters), Microsoft said that Exchange Online, Teams, SharePoint Online, Copilot 365, and Defender XDR were all experiencing issues. The status page also indicated that the outage is only affecting Microsoft's enterprise software, Microsoft 365, not its consumer products.
And in an initial update posted at 12:54 p.m. ET to X, the company said that customers were having problems with Exchange Online mailboxes "in the Americas." Exchange Online is a cloud-based tool that provides back-end support for Microsoft Outlook.
However, by 1:07 p.m. ET, the company acknowledged the problem was more widespread, affecting more services and regions. "While we're working to mitigate impact, we've confirmed the issue may affect Microsoft 365 service connectivity for users in any region," the company posted.
The Microsoft Status page was then updated with a notification that stated, "User impact: Users may be unable to connect to multiple Microsoft 365 services."
While a root cause has yet to be determined, Microsoft has at least shared a brief technical explanation for what's going on.
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