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At the beginning of August Exchange Team updated Exchange Server 2013 Deployment Assistant.
New version include the following new scenarios:
- Upgrading from a mixed Exchange 2007/Exchange 2010 deployment to Exchange 2013
- Configuring an Exchange 2013-based hybrid deployment for Exchange 2010 organizations
These new scenarios provide step-by-step guidance about how to upgrade your mixed Exchange 2007/Exchange 2010 organization to benefit from the improvements and new features of Exchange 2013. Additionally, Exchange 2010 organizations can now configure a hybrid deployment with Office 365 using Exchange 2013 if you would like to leverage the newest improvements to the Hybrid Configuration Wizard.
You can use deployment assistant here: