[Samba] Samba 3 Unix Password Sync

[Waif Urchin]

Working with my first Samba PDC using samba 3.0.3 on FreeBSD 5.2.1. 
Single subnet, handful of win2k and winxp boxes fully patched. 
Everything is working fine except the password sync.  What do I have to 
add to samba (or windows) to set it up so when someone changes their 
password on Windows it updates the passwd and smbpasswd files automatically?

Thanks.