Here is the situation. Let's say there are 10 conference rooms created as room1 through room10 as room mailboxes. How would one look at the availability of all 10 room mailboxes?

You could open the calendar of each mailbox or create a meeting request, add those mailboxes as attendees and check their availability using the scheuling assistant.http://office.microsoft.com/en-us/outlook/HP012303841033.aspxSchedule a meeting

In addition to Andy, if you have many conference rooms, you can create a Distribution group to include the rooms and add the group as attendee when creating meeting request. After clicking Scheduling Assistant, you can expand the group in order to look at the availability of all the rooms. Thanks,Mike