AD Upgrade Articles

Excellent Articles on AD Upgrades:

• Upgrading an Active Directory Domain from Windows Server 2003 or Windows Server 2003 R2 to Windows Server 2012
  https://msmvps.com/blogs/mweber/archive/2012/07/30/upgrading-an-active-directory-domain-from-windows-server-2003-or-windows-server-2003-r2-to-windows-server-2012.aspx
  
• Group Policy Settings Reference for Windows and Windows Server
  http://www.microsoft.com/en-us/download/details.aspx?id=25250
  
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