Limitations

In-place upgrades from 32-bit to 64-bit architectures are not supported. All editions of Windows Server 2012 are 64-bit only.
In-place upgrades from one language to another are not supported.
In-place upgrades from one build type (fre to chk, for example) are not supported.
Upgrades from pre-release versions of Windows Server 2012 (such as the Release Candidate) are not supported. 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.

	Created by kamsz over 11 years ago

Microsoft 70-410 Note on Upgrading to Windows Server 2012, created by kamsz on 13/08/2013.