Hi, I know that OS X can join an Active Directory Forest/Domain. (Utilities->Directory Access->Services->Active Directory) I have been trying to see if I can get an OS X client to logon/join a SAMBA PDC, without success. I always get: Invalid domain "An Invalid Domain and Forest combination was specified. You should enter a fully qualified DNS name for the domain and forest" Has anyone used "Directory Access" to join an OS X machine to a SAMBA PDC rather than Active Directory. Or can I get my OS X machine to use SAMBA when authenticating users in another way. Thanks, Jason Doran