Microsoft has issued two emergency out-of-band (OOB) updates for Windows 11 in January 2026, addressing critical issues that affected user experience. The initial patch caused a malfunction where devices would restart instead of shutting down, while the second update aims to resolve persistent problems with Outlook that rendered it nearly unusable for some users.
The second OOB update is identified as KB5078127 and is currently being distributed through Windows Update. Users can also opt for a manual download from the Microsoft Update Catalog. This patch addresses complications that occurred after installing the update released on January 13, 2026, which impacted applications accessing cloud storage services like OneDrive and Dropbox.
Prior to the release of this second update, Microsoft had advised users to utilize the web version of Outlook or modify their PST file configurations. The swift rollout of these updates indicates the severity of the issues faced by users, particularly regarding their Outlook functionalities.