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Instant Migration from Windows Server 2008 and 2008 R2 to 2012 How-to by Santhosh Sivarajan

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Forest and domain functional level (Must know)

You need to understand the role of the forest and domain functional levels before it can be raised. Some of the new features will only be available when the forest or domain functional level is set to a certain state. For example, in Windows Server 2012, the Dynamic Access Control is only available when the domain functional level is set to Windows Server 2012. Also keep in mind that, after you configure the forest or domain function level to a certain value, you will not be able to revert it. There are some exceptions to this rule. If the Recycle Bin is not enabled, you can lower the forest functional level from Windows Server 2012 to Windows Server 2008 R2 or Windows Server 2008.

At this point, we ...

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