I have the problem with TI 8.0 (8.0.826) enterprise on Windows XP Prof. clients in Windows 2000 Active Directory Enviremont!!! I make an image of XP Prof. computer with an computer account in the AD and restore it after an arbitrarily, random time (but at least a few weeks) and i could not log into the domain with error:"user is unknown for the domain". (notice: nothing changed; computers are in the same OU of the AD) Perhaps it is a Microsoft-Problem of LDAP / Kerberos!? It can't be a problem of the SID?! The SID never changed!!