We're happy to announce that we've enhanced Exchange Server Deployment Assistant to include support for configuring rich coexistence (also known as “hybrid deployment”) for organizations interested in maintaining some users on-premises with Exchange 2010 and some users hosted in the cloud by Microsoft Office 365 for enterprises. This scenario is in addition to the existing support for configuring rich coexistence between on-premises Exchange 2003 and Exchange 2007 organizations and Office 365.
The new coexistence information for the Exchange 2010 environment is only available in English at this time and requires that your existing Exchange 2010 servers are updated to Exchange Server 2010 Service Pack 1 (SP1).
Read the complete article at http://blogs.technet.com/b/exchange/archive/2011/06/10/exchange-server-deployment-assistant-update-for-exchange-2010-and-office-365-coexistence.aspx
Read my favorites blogs:
Designing a backup less Exchange 2010 Architecture
Step by step guide for upgrading Active Directory from Microsoft Windows 2003 to Microsoft Windows Server 2008
Microsoft Exchange 2010 CAS Array – Steps and Recommendations
Appear Offline in Microsoft Office Communicator Server 2007
Microsoft Exchange 2010 Test cases