Microsoft issued another out-of-band update to fix a bug that caused Outlook to crash for Windows 11 users. This second emergency patch addresses issues seen with Outlook and files stored in the cloud following Microsoft's January 2026 Windows security update.

Microsoft services were down for thousands of users, according to tracking service Downdetector.

Thousands of Microsoft 365 users were reporting outages on Jan. 22. Here's the latest.

Microsoft says uninstall Windows 11 update KB5074109 to fix Outlook Classic hangs, black screens and other stability issues affecting users.

This comes just hours after reports that another emergency update has been issued by Microsoft to affect other problems besetting users, specifically Outlook becoming “ unusable .” And it comes a week after the first emergency update for January fixed failed shutdowns and remote logins. All told, a difficult few weeks for Microsoft.

Microsoft confirms major outage disrupting Outlook, Teams and Microsoft 365 for tens of thousands of users nationwide.