We’re happy to announce that the Exchange Server Deployment Assistant has been enhanced to include support for configuring rich coexistence for organizations interested in maintaining some users on-premises with Exchange 2007 and some users hosted by Microsoft Office 365 Beta for enterprises in the cloud. This scenario is in addition to the existing support for configuring rich coexistence between on-premises Exchange 2003 organizations and Office 365 Beta. The coexistence information is only available in English at this time and additional rich coexistence support for Exchange 2010 will be added the Deployment Assistant soon.
More information at source: http://blogs.technet.com/b/exchange/archive/2011/04/26/exchange-server-deployment-assistant-update-for-exchange-2007-and-office-365-coexistence.aspx
Cheers,
Anderson Patricio
http://blogs.msexchange.org/patricio
Twitter: @apatricio