Vista compatibility with mixed system kerberos authentication?

Does Vista support single sign on kerberos authentication with a unix kds?

With our current infrastructure, we use ksetup in our Windows 2003 AD with
XP clients to add the kerberos realm for our users to login.

So far, with some breif testing, the same group policy that we use on our XP
machines (ksetup to add the kerberos realm), doesn't work on Vista. Is there
a version of ksetup or similar that is used in Vista?

Thanks!