If we schedule a meeting and invite a meeting room as a resource and the
meeting room is booked, it will send the Decline message back from the
meeting room, but still sends the meeting request to all the users. Since
the room is booked, the entire meeting really can't happen, so the meeting
has to be rescheduled again, and maybe again and again.

Is there a way to specify that if the meeting room is unavailabe, that no
other invitations will go out? In other words, have all other invitations
wait to be sent until it is confirmed the room is available?

For a single meeting this isn't a big problem because you can look at
Free/Busy, but if this is a recurring meeting for the next six months, the
organizer doesn't look at all Free/Busy for the next six months.

Thanks.