Windows Server build 22509.1000

Windows Server build 22509.1000 is an Insider Preview build of Windows Server based on the Nickel codebase. It was released to Windows Insiders on 24 November 2021.

File Explorer

 * A dropdown menu named "Filter" has been added to the command bar, but it appears empty and is not functional.
 * Pin to Quick Access is now a top-level button when right-clicking any drives.

Start menu

 * The ability to customize the Start menu layout with either more pinned items or recommendations (by increasing the size of each area of the Start menu) has been added.

Shell

 * The ability to show snap groups in Alt and Task View has been added.
 * The ability to display the clock and date on all connected monitors' taskbars has been added.
 * The ability to show up to three high priority notifications as stacked and shown at the same time alongside the normal priority notification has been added.

Settings

 * The "Apps & Features" page has been split into two pages, "Installed apps" and "Advanced app settings".
 * Users can now launch the installed apps settings page directly via the URI.
 * The advanced sharing settings (such as Network discovery, File and printer sharing, and public folder sharing) in Control Panel have been moved to a new page of the same title under Advanced network settings page.
 * Some of the entry points for network and devices settings in Control Panel have been redirected to the corresponding pages in the Settings app.

Miscellaneous

 * Added support for Discovery of Designated Resolvers, a mechanism for Windows to use DNS records to discover a resolver's encrypted DNS configuration and protocols known only by its IP address.
 * The OS will remember if Bluetooth or Wi-Fi is turned on while in airplane mode.
 * Support for rebooting Windows Sandbox inside of its virtualized environment has been added.