You need to ensure that you can install an Exchange Server 2010 server in the Active Directory forest
You need to prepare the Active Directory environment for the deployment of the first Exchange Server 2010 Service Pack 1 (SP1) server
You need to prepare the Exchange organization for the deployment of Exchange Server 2010 Mailbox, Client Access, and Hub Transport servers
You need to install the Exchange Server 2010 prerequisites for the Unified Messaging (UM), Mailbox, Client Access, and Hub Transport server roles
You need to install the Exchange Server 2010 SP1 pre-requisites for the Mailbox, Client Access, and Hub Transport server roles