Exchange Server 2013 Deployment Assistant

• Upgrading from Exchange 2007 to Exchange 2013
• Upgrading from Exchange 2010 to Exchange 2013
• Configuring an Exchange 2013-based hybrid deployment for Exchange 2007 organizations

These new scenarios provide step-by-step guidance about how to upgrade your existing Exchange 2007 or Exchange 2010 organizations to benefit from the improvements and new features of Exchange 2013. Plus, Exchange 2007 organizations can now configure a hybrid deployment with Office 365 using Exchange 2013 instead of Exchange 2010 SP3 in their on-premises organization.

 

(Mixed Exchange 2010 and 2007 is still not available)

More information can be found here;