Originally Posted by
microsoft.com
Q. Can I connect a new PC running Windows XP Media Center Edition 2005 to a work network or domain?
A.
While you can access network resources on a work network or a domain, you cannot join a Windows XP Media Center 2005 PC to the domain. PCs running Windows XP Media Center Edition 2005 are designed specifically for home use. Professional features, specifically Domain Join and Cached Credentials (Credentials Manager for logins) are not included. As a result, you will be prompted for your login username/password to access network resources after a reboot or logging back into the PC. In addition, file shares or network resources set to require a domain-joined PC for access will not be available. Remote Desktop and Encrypting File System support are still included.