Matt, AAA is a tool that automatically processes meeting requests (message class:IPM.Schedule.*) sent to one or more resource mailboxes, such as conference rooms. The agent hosts a store event sink to handle meeting requests as they arrive in a resource mailbox. Once the agent is registered on the inbox folder of a resource mailbox, meeting requests sent to a resource mailbox are automatically processed by the event sink. The sink handles acceptance,cancellation and update requests and sends notifications to the organizer. It is odd to note that you get a dialog box. Is this mailbox specified in the xml file? Does this mailbox have any delegates? If so is the "Send meeting requests and responses" check box checked by any chance! Even with that I wouldnt think the dialog box should pop up.