I have an Exchange 2010 SP1 box here in our location and if you open the scheduling assistant for an appointment you can see all of the local users as intended. However, we have another AD site with another Exchange box and if you enter a user from that DB it will show up with the / / / / / /
through it and say:
"No free/busy information could be retrieved"
This is a very slow WAN link but since all e-mail relaying works between the boxes I couldn't see this as being the issue.
I have also been into the Public Folder Management Console and the free/busy (public folder DB's) from each server are replicating to each other so shouldn't I be able to see the information about all users in the Exchange organization?