6.9 and above
If a Safeguard user has an expired password, they will be able to change their password at login.
6.8 and below
If a Safeguard user has an expired password, they will not be able to login. An user admin will need to reset their password. The maximum password age is set in Settings | Login Control | Maximum Password Age
The option "Password Never Expires" can be ticked on the Users | Authentication tab to prevent this from occuring.