Version 4.0.0alpha2 of Samba has been
"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 below, and the STATUS file, which aims to document what should and should not work.
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