Outlook 2010 / Exchange 2010 prevent double room booking

Hi,
I have a problem with double-booking of rooms in my company. I've read pretty much everything I could find on this subject and I'm still not satisfied. I setup a room in Exchange with these settings:
- Resource Booking Attendant: disabled
- Allow conflicting meetings: disabled
- Delegate of the mailbox: UserDelegate
- Users who are allowed to submit in-policy requests that will be automatically approved: Selected recipients (none)
- Users who are subject to approval by delegate (within in-policy): all users
- Users who are allowed to submit out-of-policy requests: selected recipients (none).
I believe this is supposed to work like this: everyone can request a meeting and every meeting request has to be accepted by a delegate (UserDelegate in this case). There are no conflicts allowed. 
However, it doesn't work that way. Let me give you an example of how it does work.
User1 requests a meeting in a MeetingRoom1. UserDelegate accepts the meeting, and everyone can see in MeetingRoom's calendar that the room is booked (permission set to default=reviewer). Then User2 requests a conflicting meeting at the same time and the
same room. It is not automatically rejected and can still ask for approval. UserDelegate still receives a request and CAN agree to it - even if there is conflict. Sure, there is a notification of a conflict, but room can be double booked anyway.
Let's say UserDelegate sees the notification of a conflict and rejects the meeting. User2 get an email that says his meeting was rejected, but in his calendar the meeting is still on. It doesn't disappear. It leads to conflicts, when 2 users show up at the
MeetingRoom1 and they both claim they booked the room - which is true, even though one of them was rejected. He didn't realize, since the meeting was still active in his calendar...
If I enable Resource Booking Attendant the User2 request would be denied automatically and the notification would be sent, but the meeting remains in the calendar. Besides, I don't want it to be enable, since it automatically agrees to all meetings if there
is time and space for it. I have a UserDelegate who's supposed to decide who gets the room. 
I tried to EnableDirectBooking=1 in registry in Outlook, but it doesn't work. Users still can requests the meeting.
So, in short: I don't want users to be able to book an already booked room. Can you help me with that? I can provide screenshots and EMS if you need me to.

Hello,
Declined meeting will stay in the organizer's calendar. This behavior is by design. It is convenient for the meeting organizer to check the meeting information, change the location to another room and send updates for other attendees. If the organizer want
to remove this meeting, he needs to decline the meeting and send decline updates to other attendees.
Since this issue is more related to Exchange side, I'd recommend you post your question to the Exchange forum for further assistance:
http://social.technet.microsoft.com/Forums/office/en-US/home?category=exchangeserver
The reason why we recommend posting appropriately is you will get the most
qualifiedpool of respondents,
and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.
Steve Fan
TechNet Community Support
It's recommended to download and install
Configuration Analyzer Tool (OffCAT), which is developed by Microsoft Support teams. Once the tool is installed, you can run it at any time to scan for hundreds of known issues in Office
programs.

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