Exchange 2010, outlook 2007, 10 meeting rooms
If I make a meeting for a room and it conflicts with another meeting I immediately get a pop up that the room is booked and to select another resource. This is ideal as it forces me to find another room before the meeting request is sent to all attendees.
however, for some meeting rooms this doesn't happen. I make the second meeting, it sends off and seconds later I get a conflict email with the meeting denied. This doesn't schedule in the room (as you would expect) but it still stays in the organisers calendar. This causes some confusion as the organiser often doesn't notice the conflict email, plus it is annoyingly unprofessional to have to reschedule and reinvite the other attendees.
If I go to the exchange console and use Get-CalendarProcessing it show the same settings for each room.
If I log in as the room it has the same outlook calender settings and permissions on the calender folder for each room.
To make matters more confusing..I originally had this problem for one room(room3), did a lot of google searching, and testing and eventually it came on (the immediate prompt) but I am unsure what I did- as the last thing I did was give myself explicitly full access to the calendar (when I previously only had full access via a group membership) - removing this full access didn't undo the fix - so something I did previous to that was the fix, but it must have taken a little while to kick in.
After fixing for one room I thought I would test all the rooms (as some web sites suggested it was a local registry setting that was the fix) and then I discover that some rooms work and some don't - yet I only tinkered with settings for room3 as this is the main room that staff have conflicts with.
I do get the conflict emails from these mailboxes - but I prefer the conflict pop up before we send the appointment.
It happens from multiple users.