The following table lists the scenarios in which coexistence between Exchange 2010 and earlier versions of Exchange are supported.
Coexistence of Exchange 2010 and earlier versions of Exchange Server
Exchange version | Exchange organization coexistence | |
Exchange 2000 Server | Not supported | |
Exchange Server 2003 | Supported | |
Exchange 2007 | Supported | |
Mixed Exchange 2007 and Exchange Server 2003 organization | Supported | |
You can't upgrade an existing Exchange 2000 organization directly to Exchange 2010. You must first upgrade the Exchange 2000 organization to either an Exchange 2003 or Exchange 2007 organization, and then you can upgrade the Exchange 2003 or Exchange 2007 organization to Exchange 2010. It is recommend that you upgrade your organization from Exchange 2000 to Exchange 2003, and then upgrade from Exchange 2003 to Exchange 2010.
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