Exchange 2007 Resource Mailbox – OWA issue

I have setup resource mailboxes (conference rooms) in exchange 2007. When I attempt to schedule a meeting from OWA, it works great and the system emails the “Your request was received and waiting for approval” pages to the requestor and the accept or deny page to the delegate of the mailbox. However, when I attempt to schedule a meeting from Outlook 2007, no approval or received notification emails are sent to the delegate. Is there another setting I need to change on the management shell in order to have outlook recognize the approval information? Thanks.