I've set up the Zimbra PDC setup following the wiki
Using the zimbraSambaPassword extension I managed to update the NT password when the user changes the Zimbra one. But... Is it possible to do the backward, that means update Zimbra password when the user changes it in Windows?
ps on a side note, when I change the pwd in XP I get an error saying the old password is wrong. Instead, on Samba the pw is correctly updated! But this should be another samba issue...