General Guidelines: Upgrading to Windows Server 2012

•All editions of Windows Server 2012 are 64-bit. In-place upgrades from 32-bit to 64-bit architectures are not supported.
•In-place upgrades from one language to another are not supported. However you can change the language after installation.
•In-place upgrades from one build type are not supported.
•Upgrades from pre-release versions of Windows Server 2012 are not supported. You should perform a clean installation to Windows Server 2012.
•Upgrades that switch from a Server Core installation to the Server with a GUI mode of Windows Server 2012 in one step (and vice versa) are not supported. However, after upgrade is complete, Windows Server 2012 allows you to switch freely between Server Core and Server with a GUI modes.
•If you do not see your current version in the left column, upgrading to this release of Windows Server 2012 is not supported.
•If you see more than one edition in the right column, upgrade to either edition from the same starting version is supported.

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