Exchange 2003 Auto Accept Agent trouble... HELP!

Hey all, so I have several resource mailboxes set up for our conference rooms in the office. Right now, if users schedule a meeting, it doesn't show up on the calendar of the conference room unless it accepts the meeting. I did some research and found this auto accept agent and decided to give it a try. I've installed it, registered the resource mailboxes and still not getting an automatic accept from those accounts. Any ideas? It may be that direct booking on those accounts is still enabled, but as of yet I can't find where to turn that option off. Any help would be great. Thanks!