samba - Jan 2013 - Password expiry

Can't disable password expiry for 2 different samba 3.X installations. One
is based on Debian squeeze, the other Ubuntu precise. I have altered the
password policy with pdbedit <<pdbedit -P "maximum password age"
-C -1>> and set the X flag on accounts <<pdbedit -c "[X ]"
username>>?? and the accounts passwords still exipre. Please help.