Microsoft released an emergency update, KB5078127, for Windows 11 on 2026-01-24 to address critical bugs from January's Patch Tuesday.
Key Updates and Fixes
- KB5078127 released globally for Windows 11 (versions 24H2, 25H2) as of 2026-01-24.
- Fixes issues with applications freezing when using cloud storage services like OneDrive and Dropbox.
- Addresses Outlook errors with PST files stored on OneDrive, including hanging and reopening failures.
- This update comes after a similar emergency fix on 2026-01-17 that addressed shutdown and Remote Desktop issues.
Impacted Applications
Applications affected include Outlook and cloud file storage integration. Users reported applications freezing or encountering errors when interacting with OneDrive and Dropbox. For Outlook, there were additional issues such as missing Sent Items and duplicated downloads.
Next Steps for Users
Microsoft advises users to install KB5078127 immediately to resolve these problems. Previously, uninstalling the recent security update was advised as a temporary workaround. Further information is available in Microsoft's official documentation.
