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That method is preferable to upgrading the operating system of an existing domain controller.This list covers general steps to follow before you promote a domain controller that runs a newer version of Windows Server: New features listed by server role and technology area are listed in the following table.
There are some changes related to AD DS: Third-party Server Message Block (SMB) clients may be incompatible with the secure default settings on domain controllers.The Windows Power Shell-based AD DS Configuration Wizard automatically targets the schema and infrastructure master roles in the domains where DCs are being added, then remotely runs the required ADPREP commands on the relevant domain controllers.Prerequisite checks in the AD DS Installation Wizard identify potential errors before the installation begins.For more whitepapers, video demonstrations, and presentations about other features in Windows Server 2012, see Server and Cloud Platform.Prior to the release of Windows 8, Windows Update managed its own internal schedule to check for updates, and to download and install them.In Windows Server 2003 through Windows Server 2008 R2, you ran the x86 or X64 version of the command-line tool before running the Active Directory Installation Wizard, Dcpromo.exe, and had optional variants to install from media or for unattended installation.
Beginning in Windows Server 2012, command-line installations are performed by using the ADDSDeployment Module in Windows Power Shell.
Automatic Maintenance consolidates many different features that each used to manage its own scheduling and execution logic.
This consolidation allows for all these components to use far less system resources, work consistently, respect the new Connected Standby state for new device types, and consume less battery on portable devices.
It required that the Windows Update Agent was always running in the background, consuming memory and other system resources.
Windows 8 and Windows Server 2012 introduce a new feature called Automatic Maintenance.
Taken together, the AD DS installation changes simplify the DC role installation process and reduce the likelihood of administrative errors, especially when you are deploying multiple domain controllers across global regions and domains.