writes "As the culmination of ten years' work, the Samba Team has created the first compatible Free Software implementation of Microsoft’s Active Directory protocols. Familiar to all network administrators, the Active Directory protocols are the heart of modern directory service implementations.
Samba 4.0 comprises an LDAP directory server, Heimdal Kerberos authentication server, a secure Dynamic DNS server, and implementations of all necessary remote procedure calls for Active Directory. Samba 4.0 provides everything needed to serve as an Active Directory Compatible Domain Controller for all versions of Microsoft Windows clients currently supported by Microsoft, including the recently released Windows 8.
The Samba 4.0 Active Directory Compatible Server provides support for features such as Group Policy, Roaming Profiles, Windows Administration tools and integrates with Microsoft Exchange and Free Software compatible services such as OpenChange.
The Samba 4.0 Active Directory Compatible Server can also be joined to an existing Microsoft Active Directory domain, and Microsoft Active Directory Domain Controllers can be joined to a Samba 4.0 Active Directory Compatible Server, showing true peer-to-peer interoperability of the Microsoft and Samba implementations of the Active Directory protocols."Link to Original Source