How to convert from Full Server to Server Core with GUI Management to Server Core:
· Full Server
Import-Module ServerManager
Uninstall-WindowsFeature Server-Gui-Shell -Restart
Reboot the Server
· Server Core with GUI Management (Minimal Server Interface): Windows Server 2012 Core with Server Management GUI Shell
Launch the PowerShell Window. Type Start Powershell in command prompt and hit Enter.
Uninstall-Windowsfeature Server-Gui-Mgmt-Infra -Restart
Press Enter and uninstall begin..
Reboot the Server.
· Server Core (non-GUI Server)
