KB5078135: Overview with user sentiment and feedback
Last Updated February 28, 2026
Probability of successful installation and continued operation of the machine
Overview
This out-of-band update for Windows Server 2025 (KB5078135) is cumulative. It includes updates from previous security releases, along with an additional fix. This update makes quality improvements to the servicing stack, which is the component that installs Windows updates. Servicing stack updates (SSU) ensure that you have a robust and reliable servicing stack so that your devices can receive and install Microsoft updates.
General Purpose
This OOB update includes quality improvements. It includes security fixes and improvements from the January 13, 2026, security update (KB5073379) and the out-of-band update (KB5077793) from January 17, 2026. The key fix is for an issue where 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.
General Sentiment
The general sentiment towards this KB appears to be neutral to slightly positive. The update addresses some known issues that were causing problems for users, which is a good thing. However, the fact that there are known issues in the first place indicates that the previous updates had some problems. Additionally, the update is described as an 'out-of-band' release, which typically means there were more urgent matters that needed to be addressed. Overall, it seems like this update is addressing some important issues, but there may be lingering concerns about the stability and reliability of the Windows Server 2025 platform.
Known Issues
- Windows Server Update Services (WSUS) does not display synchronization error details within its error reporting after installing KB5070881 or later updates. This functionality is temporarily removed to address the Remote Code Execution Vulnerability, CVE-2025-59287.
Disclaimer: We take measures to ensure that AI-generated content is of the highest possible quality, but we cannot guarantee its accuracy and recommend that users do their own independent research. Generated on 2026-02-28 07:11 AM
