Anyone who uses Remote Desktop Connection (RDC) in Windows XP or 2003 are strongly encouraged to upgrade to RDC 6 that was just released. The newest version has support for Windows Vista which is very important when connecting to a Vista machine or if you are on a Vista machine and are connecting to a computer that is running XP.
I have connected to an XP machine using RDC in Vista but it displays a warning saying that it couldn’t properly authenticate the PC. You can choose to ignore the warning but in work/school environments they may lock it down so that users have to pass the authentication in order for a connection to be established. For that reason it might be difficult to connect to your XP machine at home, but if you upgrade to Remote Desktop 6 that shouldn’t be a problem.
Note: If installing this on Windows XP you will need to have SP2 installed.
Here are the various download links for RDC 6:
Remote Desktop Connection 6.0 for Windows XP
Remote Desktop Connection 6.0 for Windows XP x64
Remote Desktop Connection 6.0 for Windows Server 2003
Remote Desktop Connection 6.0 for Windows Server 2003 x64
News Source: Bink.nu