You are the messaging engineer for your company. Your company has a single Microsoft Exchange Server 2003 server that supports mailboxes and public folders. The Exchange Server 2003 server hosts mailboxes for each conference room in your company. Each conference room mailbox holds the schedule for that particular conference room. You install a new Exchange Server 2007 server that hosts the Mailbox server role. You plan to move the conference room mailboxes from Exchange Server 2003 to Exchange Server 2007. You need to ensure that Exchange Server 2007 conference room mailboxes are configured as room resources. What should you do?