For most users, the difference is invisible but important for support and updates.
| Feature | Build 22621 (22H2) | Build 22631 (23H2) | | :--- | :--- | :--- | | Copilot | Not available | Yes (Preview) | | Dynamic Lighting | No | Yes | | Native RAR/7-Zip support | No (needs third-party) | Yes | | Taskbar ungrouping | No | Yes | | File Explorer modern pane | No | Yes | | Security updates | Supported until Oct 2025 | Supported until Oct 2026 | windows 22631
Crucially, both builds share the same cumulative update packages each month. When you install the monthly security update (e.g., KB5034765), it patches the core system files identically for both 22621 and 22631. For most users, the difference is invisible but
No release is perfect. As of the latest servicing updates (Moment 5), here are common bugs reported in Build 22631: Fix: Most of these are resolved by running
Fix: Most of these are resolved by running sfc /scannow or installing the latest Preview Cumulative Update for 23H2.
Alternatively:
Because 22631 is just 22621 with features turned on, "reverting" is unusual. Microsoft allows a 10-day rollback period after installation via Settings > Recovery > Go Back. After 10 days, the only way to go back is a clean installation of Windows 11 22H2.