This article is updated whenever Microsoft releases a Windows 11 Emergency update to fix issues with Windows 11 B release.
This article provides more details on any Windows 11 Emergency update(also known by the name out of band updates), which may be released bt Microsoft to fix a critical issue after the latest monthly updates.
About Windows 11 Emergency update
When Windows users encounter an issue with updates, the fix is usually delivered via Out of band updates. Unlike the predictable “Patch Tuesday” schedule, a Windows 11 emergency update is deployed only when a system-breaking bug simply cannot wait another month for a fix. It was particularly seen with Windows 11 January 2026 updates, where Microsoft had to ship two out of band updates to clean up the mess by the B release.
Latest Out of Band updates for Windows by Microsoft
The OOB releases listed below occured after January 2026.
January 24, 2026—KB5078127 (OS Builds 26200.7628 and 26100.7628) Out-of-band
With this update, Microsoft addressed the following issues after releasing the previous emergency Patch, which addressed only one issue.
Fixed: After installing the Windows update released on and after January 13, 2026, some applications became unresponsive or encountered unexpected errors when opening files from or saving files to cloud-based storage, such as OneDrive or Dropbox. In certain Outlook configurations that store PST files on OneDrive, Outlook may hang and fail to reopen unless the process is terminated or the system is restarted. Users may also see missing sent Items or previously downloaded emails being re‑downloaded.
January 17, 2026—KB5077744 (OS Builds 26200.7627 and 26100.7627) Out-of-band – Microsoft Support
Via the support document , this update fixed the following issues from the January 2026 B Release.
[Remote Desktop] Fixed: After installing the January 2026 Windows security update (KB5074109), some users experienced sign-in failures during Remote Desktop connections. This issue affected authentication steps for different Remote Desktop applications on Windows such as the Windows App.
More updates would be added, as Microsoft releases them.
A small note about Windows update terminology
Windows 11 has a monthly release cadence, with the main update released on the second Tuesday of each month, known as the “B release”. Additionally, a preview update of the next month is shipped in the 3rd or 4th week of the month, called as “C release”, so that they can identify issues. The subject of this article, i.e. Out of Band updates, is released whenever they are needed, depending on the severity of the issue.
