The Exchange Deployment Assistant is a web-based tool that helps you deploy Exchange 2013 in your on-premises organization, configure a hybrid deployment between your on-premises organization and Office 365, or migrate to Office 365. It asks you a small set of simple questions and then, based on your answers, creates a customized checklist with instructions to deploy or configure Exchange 2013. Instead of trying to find what you need in the Exchange library, the Deployment Assistant gives you exactly the right information you need to complete your task.

http://blogs.technet.com/b/exchange/archive/2013/03/04/exchange-server-2013-deployment-assistant-available.aspx