Following on from the first post in this series, this one focuses on some useful Active Directory Migration Resources.
This showcases adding a Windows Server 2012 Domain Controller to an existing network first. Migration of Active Directory from Windows Server 2003 to 2012 would be the next step once this Step-By-Step has been completed successfully.
Step-By-Step: Active Directory Migration from Windows Server 2003 to Windows Server 2012 R2
This Step-By-Step has been created to assist with that uncertainty and provide guidance for IT professionals looking to migrate their organizations Active Directory offering from Windows Server 2003 to 2012 R2.
Migrate Active Directory from Windows Server 2003 R2 to Windows Server 2012 R2
This is a step by step guide to migrating Active Directory Domain Services from Windows Server 2003 R2 to Windows Server 2012 R2.
Active Directory Domain Services and DNS Server Migration Guide
This document describes best practices for migration of AD DS Server and DNS Server from old hardware to new hardware. The elements of an existing installation that are migrated are entirely up to the server administrator. However, along with the server role, these elements usually include their configuration, data, system identity, and operating system settings. This document makes no assumptions about potential dependencies that exist between server roles. Instead, it is assumed for the purpose of this guide that you are migrating AD DS Server and DNS Server on one computer to another computer on the network without changes to topology, site settings, site link settings, or subnet settings.
Migrating a 2003 Domain Controller with DHCP to 2012 R2
This one introduces a different variable, the migration of a DC with DHCP.
Active Directory Certificate Services Migration Guide for Windows Server 2012 R2
This document provides guidance for migrating a certification authority (CA) to a server that is running Windows Server 2012 R2 from a server that is running Windows Server 2012, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003 R2, or Windows Server 2003.