My investigation of Linux/Windows integration for user authentication also showed that Windows Server 2003 R2 has UNIX Interoperability Components, also for Linux but Microsoft tends to put them all onto one pile i.e. non-Microsoft. The UNIX Components claim to be able to give a Kerberos trust between Linux and Windows servers, probably through winbind. It has Active Directory (AD) schema updates for NIS and Kerberos authentication and lets NIS slaves sync with the AD. Using Identity Management for UNIX (IDMU), you also get a Windows-based NIS server... hmmm, I can't help but read "milage may vary" between the lines... We'll see.