[Samba] Howto force all users of a samba domain controller to change their password ?

[Miguel Medalha]

Ldap Account Manager (LAM) is a web interface to LDAP.

With it, you can define Minimum password length, Minimum lowercase 
characters, Minimum uppercase characters, Minimum numeric characters, 
Minimum symbolic characters, Minimum character classes, etc.

http://lam.sourceforge.net/