Microsoftは3月13日(現地時間)、Windows 11のWindows Insider ProgramのDevチャンネル向けの最新ビルド「Windows 11 Insider Preview Build 26300.8068」をリリースしました(Windows Blog)。変更内容がほぼ等しいWindows 11 Insider Preview Build 26220.8062 (Beta Channel)も公開されていますDevチャンネルで公開されるビルドは、将来の機能アップデートで追加される可能性のある、さまざまな新機能が先行して実装されています。特定のリリースとは直接結びつけられておらず、ビルドに含まれる新機能や改善点は、準備が整い次第、将来のWindowsリリースに反映される可能性があります。Windows Insider Programの更新オプションでDevチャンネルを選択し、Windows 11のプレビュー版を使用しているユーザーは、Windows Updateを利用して最新版に更新することができます。Build 26300.8068の新機能Build 26300.8068では、プリインストールされたMicrosoftアプリに関するポリシーの更新や、回復機能の改善、OOBEの改良、ドラッグトレイの変更などが行われています。リリースノートは以下の通りです。Changes and Improvements gradually being rolled out with toggle on*[Policy-Based Removal of Preinstalled Microsoft Apps]We have updated the “Remove Default Microsoft Store packages” policy for Windows ENT/EDU to include a dynamic app removal list. IT administrators can now remove MSIX/APPX apps by adding their app package family name (PFNs) to a dynamic list.To access the policy in Group Policy settings, open the local Group Policy Editor (gedit.msc) and navigate to Computer Configuration > Administrative Templates > Windows Components > App Package Deployment > Remove Default Microsoft Store packages from the system.To remove an app via the dynamic list, add its app family package name to the multi-text list under “Specify additional package family names to remove.”To find app family package names, run the Get-AppxPackage command in a terminal. For example, here’s a command to get the package family name for Notepad.Get-AppxPackage *Notepad* | Select-Object PackageFamilyNameThe dynamic list is currently unavailable in the corresponding Intune CSP. When this feature becomes generally available, you can search for Remove Default Microsoft Store packages settings in the Settings picker.Known Limitation – OMA-URI and Multi-Entry Validation: OMA-URI cannot be used to validate multi-entry ADMX multi-Text policies; therefore, validation for the dynamic list must be done via Settings Catalog in Intune or Group Policy. Given that the Intune setting is not yet available in WIP, you will need to test using Group Policy.For information on the generally available policy, visit Policy-based in-box app removal.Feedback: Share your thoughts in Feedback Hub (WIN + F) under Developer Platform > App Deployment.[Windows Setup Experience]Expanding on our work which started rolling to Insiders last fall, you can now choose a custom name for your user folder on the Device Name page when going through Windows setup. This most recent update now makes it easier to choose a custom name. The naming option is available during setup only. If you skip this step, Windows will use the default folder name and continue setup as usual.Note: User folder names must follow standard Windows naming requirements.Feedback: Share your thoughts in Feedback Hub (WIN + F) under Install and Update > Initial out of box setup.[Windows Driver Policy update]The Windows kernel has historically allowed 3rd party kernel drivers from the now- deprecated cross-signed root program and the Windows Hardware Compatibility Program (WHCP). The WHCP program is a major step up in security compared to the cross-signed driver program, requiring driver compatibility testing, identity vetting and verification and virus scanning.Starting with this update, the Windows kernel will enforce a new policy removing default trust for cross-signed drivers. The policy allows 3rd party drivers from the WHCP program by default, with an allow list of trustworthy publishers and drivers from the cross-signing program.The feature is enabled in audit mode for a minimum of 100 hours and 3 reboots. If Windows determines that the drivers loaded during this time are compatible with the new policy, the feature is enabled. Otherwise, the system stays in audit mode.After enablement, while unlikely, some users running in enforcement mode may see cross-signed drivers blocked:Feedback: Share your thoughts in Feedback Hub (WIN + F) under Security and Privacy > Application Control.[Point-in-time restore updates]: When you launch point-in-time restore, local admins will see a settings dialog (behind a User Account Control (UAC) prompt) where they can view or change the default restore settings.This experience also now shows a list of restore points available on the device.Updated messaging in the WinRE restore experience:Added a recommendation to plug your device into a power source during the restore.The OS version number is now shown in a 4-part format (instead of 2-part).Feedback: Share your thoughts in Feedback Hub (WIN + F) under Recovery and Uninstall > Point-in-time restore.[Account Settings] Microsoft 365 Family subscribers will find an option to upgrade to a different 365 plan on the Accounts page within the Settings app. You can also remove the upgrade option by turning off suggested content in settings.Feedback: Share your thoughts in Feedback Hub (WIN + F) under Settings > Settings Homepage.[Drag Tray > Drop Tray]Expanding on our work last week, Drag Tray has been now renamed to Drop Tray. We’re also moving the corresponding settings for Drop Tray from Nearby Sharing to now be under System > Multitasking.[Input]Pen settings: we have made refinements to the Pen settings page including small changes to the options for the pen tail button. A new option, “Same as Copilot key”, enables the pen tail button to launch the same app as the Copilot key.Feedback: Share your thoughts in Feedback Hub (WIN + F) under Devices and Drivers > Bluetooth – Keyboards, Mice, and Pens.[File Explorer]We are stopping the rollout of refinements to the context menu to work on some further improvements. We will bring this back in a future release.[Other]Improved reliability of setting and using preferred display language.Removed extraneous unexpected error from sfc/scannow.公式ブログには細かな変更内容がリストアップされていますので、インストールする前に確認することをおすすめします。