Windows 2008 R2 editions (I just copy/paste here from MS ELearning)

Windows Server 2008 R2 is available in six editions. All Windows Server 2008 R2 editions, except Windows Server 2008 R2 Foundation and Windows Server 2008 R2 for Itanium-based systems, are available in Full Installation and Server Core installation. Windows Server 2008 R2 Foundation and Windows Server 2008 R2 for Itanium-based systems editions are available only in Full Installation