The latest Windows version can be installed the current and previous Remote Desktop Licensing or Terminal Services Licensing licenses in the server. For an example, Windows Server 2008 R2 can be installed Windows Server 2008 R2 and previous Remote Desktop or Terminal Services licenses in the server. However, Windows Server 2008 R2 cannot be installed Remote Desktop or Terminal Services licenses of Windows Server 2012 later because it cannot support the future version of Windows. To deploy the latest Remote Desktop environment, administrators have to install the latest Windows for Remote Desktop Services Licensing.
For more detail, please read "RDS and TS CAL Interoperability Matrix".
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