System Requirements
First, you need to make sure that your Active Directory (AD) environment and your Exchange server meet the minimum requirements:
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AD forest functional level is Windows Server 2003 (or higher)
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AD Schema Master is running Windows Server 2003 w/SP1 or later
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Full installation of Windows Server 2008 w/SP2 or later OR Windows Server 2008 R2 for the Exchange server itself
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Exchange server is joined to the domain (except for the Edge Transport server role)
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