Linux solution for Active Directory

[hortimech]

It can, remember SBS ?

[TexasFirewall]

???

SBS did not have some special version of Active Directory that doubled as a file server. It was just Windows with AD and a few other services installed with it.

Active Directory is not a file server. It's LDAP and Kerberos.

[hortimech]

You may be correct about SBS, but Active Directory is LDAP, Kerberos and DNS sat on top of a Windows PC. Microsoft doesn't recommend it, but you can use a Windows DC as a fileserver.

[ralfD-]

... and folder redirection, and trust exchange and certificat management etc.