How can i authenticate my users against Active Directory?

Hi @ all, I'm a freeradius newbie and try to authenticate a user against a active directory . My freeradius has version 1.0.2 I googled a lot and found differend hints how to implement this. (ntlm, pam-module), but no configuration example. Which of these ways is the securest way? Are there any other possibilities? Are there any manuals/helps or can someone discribe me how to implement this? thx Christian Schuster