Booking rooms using Outlook 2007 on Exchange 2003

Hi

We have some trouble rebooking meeting rooms using Outlook 2007
clients on our Exchange 2003 server. Here is how is (not) works:
- Book a meeting inviting "meeting room A" as a resource
- Checking the meeting rooms calendar I verify that the room (as
expected) really is booked.
- Now, I change my mind and want to book another meeting room, so I
doubleclick on the meeting, remove "meeting room A" from the resources
field and add "meeting room B" to the resources field.
- Checking the calendar of both meeting rooms I can see no change -
room A is still booked and room B isn't :-(

Now, the funny (hmm) part is, that doing the exact same procedure
using Outlook 2003 (on Exchange 2003) turns out the way one would
expect (that is, room B is booked and room A isn't).

1) Anyone out there who can confirm the above problem?
2) Does anyone has a solution?

Regards

/Torsten