Upgrading Existing Domain Controllers
If the decision has been made to upgrade all or some existing hardware to Windows Server 2012, the process for accomplishing this is straightforward. However, as with the standalone server, you need to ensure that the hardware and any additional software components are compatible with Windows Server 2012. The requirements for the server to upgrade are as follows:
• The OS on the DCs must be a 64-bit OS.
• The OS on the DCs is Windows Server 2003 SP3 or Server 2008 (or higher). The DC hardware exceeds the Windows Server 2012 requirements and all software is compatible with Windows Server 2012, including antivirus software and drivers.
• There is enough disk space free to perform the OS and Active Directory ...
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