Microsoft has released cumulative update KB5078129 for Windows 10 version 22H2, available through the Extended Security Updates (ESU) program. This update is intended for systems with x86, x64 (AMD64), and ARM64 processors and resolves a critical issue with application freezes and file operation errors in cloud storage services, including OneDrive and Dropbox, which appeared after the January updates. Specifically, it fixes a crash that caused Outlook to freeze when using PST files stored in OneDrive, as well as issues with duplicate downloading of emails. It is important to note that update KB5078129 is only available for manual installation from the Microsoft Update Catalog.
- File system. Fixes an issue where after installing the updates from January 13, 2026, some applications might become unresponsive or encounter errors when opening and saving files in cloud storage services such as OneDrive or Dropbox.
- Microsoft Outlook. In certain configurations where PST files are stored in OneDrive, the application could freeze and would not restart without force-closing the process or rebooting the system. Users could also experience items disappearing from the Sent folder or duplicate downloading of previously downloaded emails.
Currently, no critical problems specifically related to this update have been reported. However, to continue receiving security updates after the end of support for Windows 10, Microsoft recommends that users enroll in the Extended Security Updates (ESU) program. If you have already installed the previous updates, only the new fixes contained in this package will be downloaded and installed on your device.
Update KB5078129 is not available for installation through Windows Update. You can manually download the update from the Microsoft Update Catalog.
If you wish to perform a clean installation of Windows 10 Build 19045.6812 (version 22H2), you can use the UUP dump service to download UUP files directly from official Microsoft servers and create a bootable ISO image.
| Feature / Change | Performance impact | Optimization | PC speed impact | Gaming optimization |
|---|---|---|---|---|
| File system fix for cloud storage (OneDrive, Dropbox) after Jan 13, 2026 updates | 🟢 High improvement (fixes unresponsiveness and errors when opening/saving files) | 🟢 High (resolves file I/O bottlenecks in cloud-synced folders) | 🟢 High (eliminates application hangs that slow down overall system responsiveness) | ⚪ No direct impact (indirect benefit if cloud sync was consuming CPU/disk) |
| Microsoft Outlook fix for PST files stored in OneDrive | 🟢 High improvement (prevents freezes requiring force-close or reboot) | 🟢 High (fixes duplicate email downloads and missing Sent items) | 🟢 High (avoids system-wide slowdowns caused by Outlook hangs) | ⚪ No impact |
Find and Change Settings
| Setting | Where to find | How to change |
|---|---|---|
| File System Cloud Storage Fix | Settings > Windows Update > Update history | Install the latest cumulative update released after January 13, 2026. After installation, restart your device. No additional configuration is required; applications should no longer become unresponsive or encounter errors when opening and saving files in cloud storage services such as OneDrive or Dropbox. |
| Microsoft Outlook PST in OneDrive Freeze Fix | Settings > Windows Update > Update history | Install the latest cumulative update released after January 13, 2026. After installation, restart your device. If Outlook was previously frozen, force-close the process or reboot the system first, then open Outlook normally. Items should no longer disappear from the Sent folder, and previously downloaded emails should not be downloaded again. |
The last 10 Windows updates:
| Update | Build | Version | Windows | Channel | Date |
|---|---|---|---|---|---|
| KB5121157 | 28020.2818 | 26H1 | Windows 11 | Beta | 2026-08-31 |
| KB5121158 | 28120.2824 | 26H1 | Windows 11 | Experimental | 2026-08-31 |
| KB5121794 | 26300.9278 | 26H2 | Windows 11 | Preview | 2026-08-27 |
| KB5121132 | 28120.2760 | 26H1 | Windows 11 | Experimental | 2026-08-21 |
| KB5124040 | 26220.9223 | 25H2 | Windows 11 | Beta | 2026-08-21 |
| KB5124042 | 26340.9233 | 26H2 | Windows 11 | Experimental | 2026-08-21 |
| KB5121106 | 28020.2731 | 26H1 | Windows 11 | Beta | 2026-08-17 |
| KB5121109 | 28120.2738 | 26H1 | Windows 11 | Experimental | 2026-08-17 |
| KB5124036 | 26220.9202 | 25H2 | Windows 11 | Beta | 2026-08-17 |
| KB5124038 | 26340.9212 | 26H2 | Windows 11 | Experimental | 2026-08-17 |