Purpose-built Linux distros are appearing faster than zombies in a first-person shooter. Need a drop-in replacement for Microsoft's Primary Domain Controller? Try the Domain Controller Appliance.

If you’d like to set up a domain controller on the cheap, Samba makes this possible. Here’s how. With the help of Samba, it is possible to set up your Linux server as a Domain Controller. Before you ...

I know that it's possible, Samaba3 supports NT4 PDC and BDC role. Samba4 will/does support AD role. And in meantime there is other options for LDAP servers. Windows 7 can be put in VM using KVM or Xen ...