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The actual upgrade process involves preparing AD DS, performing the in-place upgrade, updating the available certificate templates, and then choosing whether to implement the new Windows Server 2008 features and options.
Before you can upgrade your CAs to Windows Server 2008, you must ensure that the Active Directory schema is upgraded to the Windows Server 2008 version. The Windows Server 2008 schema update does not require you to migrate your domain controllers to Windows Server 2008.