Samba 4 Moves Closer to Active Directory Server Compatibility

“For years, if you wanted an inexpensive, but Windows-compatible
file and print server, you turned to Samba running on Linux. Now,
with the first alpha release of Samba 4, this open-source project
is moving closer to becoming a complete Windows 2003/Longhorn

“Since Samba 3 arrived in 2003, Windows network administrators
have been able to use Samba and Linux as a drop-in replacement for
an NT file/print server. You could, and many have, used Samba in
place of an NT PDC (primary domain controller)…”