I'm running Outlook 2007 SP2 (12.0.6514.5000) against an Exchange 2003 server.
I have found that meeting requests sent to resources are not auto-replying with the "This resource has been booked successfully" or any response at all. The resource calendar in question is set up to auto-reply to calendar requests.
It appears that Oultook2003 clients do not have this issue with the same resources.
Any thoughts on why this might be happening?