http://news.samba.org/releases/4.0.0alpha1/ 4 September 2007
Samba 4.0.0 alpha1 Available for Download
Samba 4 is the ambitious next version of the Samba suite that is being developed in parallel to the stable 3.0 series. The main emphasis in this branch is support for the Active Directory logon protocols used by Windows 2000 and above.
Samba 4 is currently not yet in a state where it is usable in production environments. Note the WARNINGS in WHATSNEW.txt in the source and the STATUS file which aims to document what should and should not work.
Samba4 alpha1 is the culmination of 4.5 years of development under our belt since Tridge first proposed a new Virtual File System (VFS) layer for Samba3 (a project which eventually lead to our Active Directory efforts), and 1.5 years since we first released a Technology Preview. We wish to allow users, managers and developers to see how we have progressed, and to invite feedback and support.
Что самое интересное, что "support for the Active Directory logon protocols". Я так понял, теперь можно создавать AD на Linux. Скачаю, если кому надо, выложу. Пока альфа жаль.