Active Directory Domain with SAMBA or Other Tool

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http://unix.stackexchange.com – Can I create a domain using SAMBA and set up Active Directory with SAMBA on it? And by this I mean no windows servers involved. I would also like to be able to log in from a Windows machine. Preferably on OpenSuSE. My objective is to have a domain with centralized authentication just like AD. I want to be able to log in using both Windows and Linux computers. How can I do that in SAMBA? What other solution you guys recommend if Samba4 is not a viable one? (HowTos)