This applies with XP SP3, Vista SP1, and Server 2008 – read the below linked KB to learn about RDC 6.1 and its nice features including huge important improvements in remote printing. There are nice security enhancements too to fit in with Server 2008’s NLA (Network Level Authentication)
This article discusses the Remote Desktop Connection (RDC) 6.1 client update that helps you use the new Terminal Services features. These features are introduced in Windows Vista and in Windows Server 2008 and are available from a computer that is running one of the following operating systems:
•Windows Vista with Service Pack 1 (SP1)
•Windows XP with Service Pack 3 (SP3)
•Windows Server 2008
The RDC 6.1 client can be used to connect to legacy terminal servers or to remote desktops as before. However, the new features that are mentioned in this article are available only when the client connects to a remote computer that is running Windows Vista or Windows Server 2008.
This fits in series with this earlier post discussing the /admin switch that replaces /console: