Microsoft has just released another, “out-of-band” series of updates—including KB5078127 and KB5078132—to address a critical system issue currently impacting Windows 11 (versions 25H2, 24H2, and 23H2) and Windows 10 (22H2) users worldwide.
Unlike standard monthly patches, this emergency rollout was triggered to immediately resolve a high-priority bug that was causing load and save issues for files stored in the cloud. It is the second out-of-band update of January 2026, after last week’s emergency patch to fix broken Remote Desktop Connections.
The patches are distributed automatically to all non-managed Windows PCs via Windows Update.
Essential information
- Windows 11, versions 25H2 and 24H2: KB5078127
- Windows 11, version 23H2: KB5078132
- Windows 10, version 22H2 (ESU-only): KB5078129
- Windows Server 2019: KB5078131
- Windows Server 2022: KB5078136
- Windows Server 2025: KB5078135
The issue occurred after installing the January 2026 cumulative updates for client and server versions of Windows.
Microsoft admits that users of Outlook were especially affected by the issue, provided that the Outlook PST files were stored in the cloud and not on the local machine.
Outlook users might notice hangs or issues when reopening Outlook. Other issues that users might experience included noticing that sent items were missing or that previously downloaded emails were downloaded again.
Windows users who use Outlook and store the PST files in the cloud should install the update immediately. Microsoft does not mention any other changes in the update, which means that users of unaffected systems can ignore it for now. It will be included in the February 2026 cumulative update.
How to check your Windows Version
To find your version, press Win + R, type winver, and hit Enter. Once you know your version, look for the corresponding update in Settings > Windows Update.
| Windows Version | Update ID (KB) | New OS Build |
| Windows 11, version 25H2 | KB5078127 | 26200.7628 |
| Windows 11, version 24H2 | KB5078127 | 26200.7628 |
| Windows 11, version 23H2 | KB5078132 | 22631.6495 |
| Windows 10, version 22H2 | KB5078137 | 19045.6812 |
While these frequent “out-of-band” patches can feel like a game of digital whack-a-mole, they serve as a reminder that updates do not only fix issues but may also introduce them.
As such, it is highly recommended to take necessary precautions, such as backing up the system partition before installing updates.
I’ve been running KB5078127 for over 2 hours without a problem. It appears I was alerted to its availability with a white square around the taskbar Start icon.
It’s curious how quickly they fix issues that prevent you from uploading your stuff to them. 🙄
It makes me wonder if they are vibe coding everything now….
You know what they say about vibe coding. “Spend 5 minutes coding and a week debugging”.
It’s crazy how slow their servers are when downloading updates. I am glad I only run Windows in a VM.