[Samba] Sync password (with MIT-kerberos server) and migration

[FM]

Hello, my first post here :-),


For several years, I are using samba 2.0 with local backend for windows
stations and servers.
NIS was our used for Linux stations and servers

Now, LDAP /KERBEROS is replacing NIS and Samba (with ldap backend) will
replace the local backend .

My questions : 
1- How can I migrate information form server1 (samba 2) to server2 (samba 3)
? I read the official Samba how-to but this scenario is not covered.

2- Because Samba can not use MIT-Kerberos for password (as far as I know), I
need to sync samba password with Kerberos database. When user from Windows
want to change his password, samba will use a custom script (not created yet
) to also so update the Kerberos password (if you have examples they're more
then welcome).
But the big problem is Linux users : If they want to update they password,
they use kpasswd but it will not update  samba password.
Is one of you manage to create a script to update both DB form command line
? I not a kerberos/samba expert but I suppose it's possible to change samba
password form linux command linux and then call the kerberos kpasswd to also
change this password. Then, I'll add it to all users ~/bin

Thanks !!

FM