These are some of Transition Checklist that u may follow:
•Decide which version you needs (RTM or SP1. Standard or Enterprise. 64-bit.)
•Which operating system will you use? (Windows Server 2008 is the best)
•Which version of Active Directory you use? (Windows Server 2003/ 2008)
•Prepare Active Directory: Like extend the Schema. The domain controller holding the Schema Master role must be Windows Server 2003 SP1 or later.
•Global Catalog server running Windows Server 2003 SP1 or later on each site that you install Exchange Server 2007.
•Verify DNS operates correctly.
•Select the best functional level for your domains (Windows 2000 Native or later)
•Select the Forest Function Level
•Check the names like Exchange Organization name, default email address.
•Change the Operaional Mode from mixed to Native
•Use Exchange Best Practice Analyzer to validate everything.
•Plan for co-existence with different versions of Exchange Server. There is no in-place upgrade even from Exchange 2003
•Repercussions when you decommission the Exchange 2000 / 3 servers like moving the Offline Address Book and the Recipient Update Service to Exchange Server 2007. Check, and if necessary, remove legacy routing groups and also legacy connectors.
•Once again run Exchange Best Practices Analyzer. Avoid any conflicts with .NET framework. Check these scans: Health, Permissions, Connectivity and Exchange 2007 readiness.
•Plan your sequence of Exchange roles, CAS role first. The Mailbox Server is probably the biggest job, but don't forget no email gets delivered without a server configured with the Hub Transport role.
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