The new Exchange Deployment Assistant is a Web-based tool that walks you through various upgrade and deployment scenarios, including upgrades from Exchange Server 2003 and/or Exchange Server 2007 to Exchange Server 2010. Currently, the Upgrade from Exchange Server 2003 is the first scenario available. The tools asks a few questions about your current environment and then generates customized instructions for your upgrade.
More to come,
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i would like to transition exchange 2003 to 2007 , do you have any useful link that will show me how to do that step by step ?