What's the point in using Samba as the PDC fi the BDCs are still using a Microsoft OS. You're not saving on license costs, you're introducing complexity, adn you're limiting functionality to whatever Samba offers. You're better off either to iplement a clean Samba/LDAP/NetWare directory or go for Active Directory. You can still incorporate Samba-based file/prin-sharing without making the Samba-computer the PDC.
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There are two types of vessels, submarines and targets.