Microsoft has released another emergency update for Windows 11 after its latest monthly patch caused unexpected app crashes and system issues for users. What was supposed to be a routine security update in January quickly turned into a problem, with reports of apps freezing, Outlook functions malfunctioning, and cloud-synced files stopping behaving.
Some of the problems were so severe that Microsoft even advised certain users to uninstall the update completely. Now Microsoft has intervened again with a second out-of-band update to finally stabilize the situation.
Why Microsoft had to intervene again
The problem began with the January Patch Tuesday update, which introduced bugs that affected how apps interacted with files stored in cloud services like OneDrive. Shortly after installation, some users noticed that everyday apps became unstable.
Outlook was the most affected, especially for classic Outlook users with PST files stored in OneDrive folders. In many cases, Outlook would freeze, crash on startup, or repeatedly download old emails, rendering it nearly unusable.
Microsoft initially released an emergency fix earlier this month to address issues such as shutdown errors and remote desktop issues. However, this first emergency update did not completely solve the app crash problem and in some cases introduced new complications. This led to the release of a second emergency cumulative update called KB5078127.
The new update combines previous security fixes with targeted repairs for app crashes related to files stored in the cloud. It specifically addresses the Outlook PST issue and broader issues where apps stopped responding when opening or saving files in synced folders. For users who rely on cloud backups for business or personal data, this fix is ​​particularly important.
KB5078127 is now rolling out through Windows Update for supported Windows 11 versions. The installation is automatic for most users, but can also be checked manually. Even if you haven’t noticed any crashes, installing it is still recommended as it includes security and stability improvements over previous updates.
