We're happy to announce that the Exchange Server 2010 Deployment Assistant has been enhanced to include support for configuring rich coexistence (“hybrid deployment”) for organizations interested in maintaining some users on-premises with Exchange 2010 and some users hosted by Microsoft Office 365 for enterprises in the cloud. 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 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).


Rich coexistence (“hybrid deployment”) offers organizations the ability to extend the feature-rich experience and administrative control they have with their existing on-premises Microsoft Exchange organization to the cloud. It provides the seamless look and feel of a single Exchange organization between an on-premises organization and a cloud-based organization. In addition, it can serve as an intermediate step to moving completely to a cloud-based Exchange organization. This approach is different than the simple Exchange migration (“cutover migration”) and staged Exchange migration options currently offered by Office 365 outlined in E-Mail Migration Overview in the Exchange Online help.


If you aren't already familiar with the Deployment Assistant, it allows you to create Exchange 2010 on-premises configuration and deployment instructions that are customized to your environment. It asks you a few simple questions and provides a checklist with instructions that are designed to deploy or configure Exchange 2010 based on your answers. In addition to the online checklist, you can even print a PDF of your checklist.


Your feedback is very important for the continued improvement of this tool. We would love your feedback on this new scenario and any other area of the Deployment Assistant. Feel free to post comments on this blog post, provide feedback in the Office 365 community migration and coexistence forum, or send an email to edafdbk@microsoft.com via the 'Feedback' link located in the header of every page of the Deployment Assistant.  Thanks!