This question is in regards to TS licensing with regards to Windows 7 Professional (and Vista Business for that matter).Specifically:We are still running a Windows 2000 Terminal Services server as our primary application server.All of our current client computers are running Windows XP Pro -- which includes a TS CAL for remote connections to a Windows 2000 Server. What are the licensing terms for Windows 7 Pro and Vista Business?Are they still considered as having a TS CAL for connection to a Windows 2000 Server?As the OEM versions still include downgrade rights to XP Pro, I would assume that they do -- or at least do if we exercise the downgrade rights. Is this correct?That said, how do these OS's handle the assignment of automatic licenses from the server and will they continue to operate properly after 3 months in the event we decide to upgrade some of our machines to Win 7 Pro?I am almost hoping that the answer to these questions is no, as it may give me some leverage to finally justify an upgrade to Server 2003 or 2008 (which has thus far been unpalatable partly due to the fact that we would have to not only purchase a new OS and new CAL's, but TS CAL's as well). If W7P and VBiz won't support W2K TS licensing, then I may be able to argue in favor of an upgrade once the OEM downgrade rights for WinXP expire). And, yes, I realize open license and SA contracts would make life a lot easier on many fronts...but that simply isn't happening either due to cost issues (i.e. in the larger scheme of "saves time for overworked sys admin" vs "up front capital outlay", 3 guesses which wins...).

You may find the answer from the following blog. Remote Desktop Services (Terminal Services) Team Blog Arthur Xie - MSFT