Understanding Upgrade from Exchange 2003 and Exchange 2007 to Exchange 2010
Applies to: Exchange Server 2010 SP3, Exchange Server 2010 SP2
Topic Last Modified: 2010-07-29
When you're upgrading your mixed Microsoft Exchange Server 2003 and Exchange Server 2007 organization to Exchange Server 2010, there's a period of time when these earlier versions of Exchange and Exchange 2010 will coexist within your organization. This section discusses key points about both the upgrade process and coexistence as they apply to the Client Access, Transport, and Mailbox server roles.
For more information, see the following topics:
For more information about the upgrade process for the mixed Exchange 2003 and Exchange 2007 organization, see the "Exchange 2007 and Exchange 2003 Mixed Mode Coexistence" section in Exchange 2003 - Planning Roadmap for Upgrade and Coexistence.
Also, see Exchange Server Deployment Assistant for information about a Web-based tool that can help you with your deployment.