Windows Server 2012 Standard Windows Server 2012 Standard Windows Server 2012 Essentials Windows Server 2008 R2 Standard Windows Server 2008 R2 Datacenter Windows Server 2008 R2 Enterprise Windows Server 2008 Datacenter Windows Server 2008 Enterprise Windows Server 2008 Standard Windows Server 2008 Datacenter without Hyper-V Windows Server 2008 Enterprise without Hyper-V Windows Server 2008 Standa