It seems that at Vista client, when the user´s password expires, it
doesn`t appear any more the advice to change it.

Also, at the moment of expiration, an error windows appears about de
Nwtrash, but no change password prompt appears at all.

So, as a workarround to the problem of not being noticed of the password
expiration, when the error windows appears, it means, that the password
has expired. Hence, changing the password by Ctrl+Alt+Del method, and
selecting to change the password from there, it works, till the new
expiration time again.

It`s better than to have to remind the expiration day, isn´t it?