ATTENDEE INFORMATION PROBLEMS

Hello Everybody.
I am having an issue with our Outlook Calendar. Our
company has about 35 email accounts setup. The problem is
since our server crashed; we have been running Outlook off
a server from our parent company 1 hour north of here.
What is happening is about half of the attendees, when
setting up a meeting, show "no information" for the
availability. The other half that can not be seen all see
each other, but can not see any information for the rest
of the users. So it is as though it is working but
everyone is not able to see everyone else. Other bit of
info... we are running 2k and XP and it does not make a
difference what system is running, the problems are still
there. If anybody has any ideas at all, that would be
great.
Thanks in advance,
Zachary S.