How do I set plesk 7.0 for windows up to force my clients and domain users to change there password every 6 months?

I had set this up as a windows policy and thought that would do it, but when I was looking at user accounts created by plesk it sets them to password never expiring and that they can't change it.

Can I switch those settings in the windows user maneger?

Windows 2003, with Plesk 7.0.1