https://www.bleepingcomputer.com/news/microsoft/microsoft-removes-windows-11-update-block-for-virtualbox-users/ > Microsoft has removed the last Windows 11 safeguard hold after Oracle addressed a known VirtualBox issue causing errors and virtual machine start failures when Hyper-V or the Windows Hypervisor were installed. > Safeguard holds prevent users from upgrading to Windows 11 to protect their systems against potential upgrade issues, in this case, software instability caused by compatibility issues between Windows and VirtualBox.