I am very confused about this application

We are an office that does not use Exchange. We have a shared server and
would like to be able to publish our free/busy time schedules there. I have
followed the instructions on this article

http://office.microsoft.com/en-us/as...959481033.aspx

Everything seems to work when I’m setting up, but it does not actually show
the free/busy time for users. When I hover over the area, it says "no
information could be retrieved".

I can see the files on my server, everyone seems to be publishing fine.

Please help!!!