To ensure you download the correct fix, you need to identify your specific Windows Version and OS Build. Since we are in late January 2026, Microsoft has released separate “Out-of-Band” (OOB) updates for different versions to fix the recent Outlook crashes and boot loops.
1. Identify Your Windows Build
The quickest way to see exactly what you’re running is the Winver command:
- Press Windows Key + R on your keyboard.
- Type
winverand hit Enter. - A dialog box will appear. Look for the lines that say Version and OS Build.
2. Match Your Version to the Correct Fix
Based on the data as of January 27, 2026, here is which patch you need:
| Windows Version | Required Build After Fix | Update ID (KB Number) | Primary Issues Fixed |
|---|---|---|---|
| Windows 11 25H2 | 26200.7628 | KB5078127 | Outlook crashes, unresponsive cloud apps |
| Windows 11 24H2 | 26100.7628 | KB5078127 | Outlook/OneDrive hangs, UI lag |
| Windows 11 23H2 | 22631.6495 | KB5078132 | Shutdown acting as Restart, RDP bugs |
| Windows 10 22H2 | 19045.xxxx | KB5078129 | App freezes (ESU/Enterprise only) |
3. How to Download Manually
If your “Check for updates” button isn’t working or the update fails to install automatically:
- Go to the Microsoft Update Catalog.
- Enter your KB Number (e.g.,
KB5078127) in the search bar. - Choose the correct Architecture:
- x64: For most standard Intel or AMD laptops/desktops.
- ARM64: For newer “Copilot+” PCs or Surface devices with Snapdragon processors.
- Download the .msu file and run it.
⚠️ Warning: If you are currently experiencing a Black Screen or cannot log in, do not try to install these yet. You must first go into Recovery Mode (WinRE) and Uninstall the latest quality update (likely KB5074109) to restore system stability before applying these new fixes.