Para modificar as opções de Terminal Services no Windows Server 2008 proceda conforme abaixo: 1) Para habilitar a opção "Allow connections from computers running any version of Remote Desktop (less secure)" modifique as 2 chaves do registry
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Read the complete post at http://blogs.technet.com/mhunecke/archive/2008/10/31/como-habilitar-desabilitar-o-remote-desktop-terminal-service-remotamente.aspx