Any license server can manage all lower version CALs along with current version. For e.g., a license server running Windows Server 2008 R2 can manage lower version CALs including 2000 Server, Server 2003, Server 2008, as well as R2 CALs. These CALs can be installed and managed by Licensing Administrator on license server by using RD Licensing Manager in Windows Server 2008 R2. The license server running R2 will also be able to cater to requests from all lower version terminal servers appropriately, allowing customer business to continue seamlessly. Note: Beginning with R2, terminal servers are now called Remote Desktop Session Host servers. All earlier versions are still referred to as terminal servers. The compatibility matrix below shows which CALs can be managed by which license servers.