You may already have a resource room mailbox in Exchange that provides the scheduling feature, or you may be creating a resource mailbox for the first time to facilitate LRS deployment. In any case, you must identify a room account to be used in your tenant. The Exchange Online Provision and Lync Provision sections provide guidance for both kinds of accounts. For example, let’s say you have the following two rooms, and you would like to deploy LRS for both of them: