Apparently not (note bad sarcasium), In announcement by Microsoft stated that Windows XP, 2000 and 2003 Server are open to DoS (Denial-of-Service) attacks through its Remote Desktop Protocol. Microsoft also stated that "Due to a flaw in the way Windows handles remote desktop requests, an attacker could crash a PC by sending a malformed remote request." This was confirmed last friday (7/15/05). They also said that a fix is on the way and no attacks of any kind using this flaw have been reported. Computers using services that have RDP enabled are vulnerable so, Microsoft suggests users to block port 3389, which is what RDP uses, And to also disable terminal services if the services are not required to be used.
[ Soure: techtree.com ]