I have read documents about mountain lion doesn't work as PDC as previous versions Line Snow Leopard does. I know there are various post/webs/documents talking about it but the information is very confusing.
I would like to create a PDC on OSX Mountain Lion to login 15 OSX and about 5 Windows. Is it possible using OSX Server Mountain lion out of the box?
Thanks!
No, it's not possible. Apple removed Samba in favor of it's own, much more limited CIFS implementation in 10.7. This variant is not able to work as a PDC, it's just a CIFS/SMB file server.
Rumor has it the reason is a licensing switch the Samba team did after Samba 3.0.26 (IIRC) which made it unfeasible for Apple to continue to incorporate it into MacOS.