Ignore the LDAP portion enterily. Windows domain controllers do LDAP
yes, but it's still a windows domain. The limitation of a Native
Windows 2003 Active Directory is that domain controllers must be
Windows 2003, so no Windows 2000 or Windows NT domain controllers.

A Windows 2003 Native Active Directory still supports WinXP, Win2k,
Win9x, WinNT4, etc...so as long as the version of samba you're running
can join a domain, you're more or less set.

Setup samba as a domain member, setup winbind if you want to use the
windows domain to login clients to Linux workstations, etc. Read the
Official Samba 3 HOWTO. :)

I'd suggesst upgrading the older versions of Samba to the latest
version. If that isn't an option, samba can still join the domain, but
IMHO, you're better off maintaining one version of samba than many
different versions, you'll just end up confusing yourself getting the
differences between 2.x and 3.x figured out.

-- 
Andrew S. Zbikowski | http://andy.zibnet.us
 A password is like your underwear; Change it
 frequently, don't share it with others, and
     don't ask to borrow someone else's.

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