free/busy scheduling problem

I need some help with the Microsoft free/busy scheduling
service. I have set up 5 machines to share scheduling
information using the service. 3 of the 5 machines work,
but the 2 that have failed have the exact same problem.
The problem is this: when logged in as the user, the
service does not work... it can not pull scheduling
information. When logged in as Administrator, it works
fine. Since it works as Admin, it is not a connectivity
problem. I have moved user to administrators group, it
still doesnt work so not a permissions problem. This
service uses microsoft passport accounts... it seems to
have somehow linked the users passport account to the
administrator as the user... any ideas??