Few months after releasing the latest major version of Exchange, Microsoft has published a new deployment assistant to help customer in their Exchange 2013 deployment.
This new version will provide guidance to deploy Exchange 2013 On Premises, in hybrid mode with Office 365 or on a cloud based only deployment.
Additional scenario for customers with Exchange 2007 or Exchange 2010 already deployed will be added later. Don’t forget you need first to deploy a Service pack within your existing organization if you want to have coexistence with Exchange 2013.
You can start using the Exchange 2013 Deployment Assistant from http://technet.microsoft.com/exdeploy2013
For Exchange 2010, the deployment is still available at http://technet.microsoft.com/exdeploy2010