How to Remote Desktop into a Windows Server from Ubuntu. There are a number of ways to do this actually, but the one below is pretty simple. And it is all thanks to the ultra useful rdesktop command.
To connect to a Windows box, simply open a terminal and enter
rdesktop myserver.com
(Of course, you could enter the IP address of the machine you wish to connect to as well).
If you want to specify the user account with which to connect, enter:
rdesktop -u username myserver.com
where username is your preferred user account login name. If you would like to access the Remote Desktop session in full screen mode, enter:
rdesktop -u username -fP myserver.com
The -f switch indicates full screen while the -P sets up the bitmap cache for speed.
Nifty.