I want to replace Windows Server by Samba 4 for authentication purpose [closed]

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http://serverfault.com – I am using windows Server 2008 in a mediam size organization. I have 200 clients at the moment. I have learn that Samba4 has a remarkable changes for windows clienmts. I want to use Samba 4 to authenticate my windows xp and windows 7 clients machines. In my home based pc I am using vmware to test samba 4. For that purpose I am using CentOS 6.3 with Samab4. Kindly guide me taht it is possible that I replace windows server as a PDC controller and use samba4 to onlu authenticate my clients. I does not want Group Policy only and only authentication . So what u suggest me. Is it good to use samb (HowTos)