Actually Active Directory already ran on Linux. Samba4 has support for AD up to 2008 R2. Currently I don't think ADAM is builtin yet, but SAMBA4 is already in a

Actually Active Directory already ran on Linux. Samba4 has support for AD up to 2008 R2. Currently I don't think ADAM is builtin yet, but SAMBA4 is already in a good state, however it still misses a good GUI, (you need a MS OS to configure some stuff, like GPO)