It seems the January cumulative updates for Windows 11 come with a lot of issues. To fix the bugs, Microsoft earlier released a set of new patches, and now we have the second unscheduled update set in the last two weeks. While the first set addressed issues with Remote Desktop and hibernation, the new update aims to fix Outlook and cloud storage.
The official changelog for update KB5078127 :
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- [File System] 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.
This new KB5078127 for Windows 11 versions 24H2 and 25H2 includes all the changes and improvements included in KB5073455 released on January 13, 2026, and KB5077797 released on January 17, 2026.
An unscheduled update with the same list of fixes has also been released for other supported versions and editions of Windows, including Windows 11 23H2, Windows Server, and others. The full list of released updates is as follows.
- Windows 11 versions 25H2 and 24H2: KB5078127
- Windows 11 Enterprise versions 25H2 and 24H2 Hotpatch KB5078167
- Windows 11 version 23H2: KB5078132
- Windows 10 ESU (22H2) and Windows 10 Enterprise LTSC 2021: KB5078129
- Windows Server 2025: KB5078135
- Windows Server 2025 Datacenter: Azure Edition Hotpatch KB5078239
- Windows Server version 23H2: KB5078133
- Windows Server 2022: KB5078136
- Windows Server 2022 Datacenter: Azure Edition Hotpatch KB5078238
- Windows Server 2019 and Windows 10 Enterprise LTSC 2019: KB5078131
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