Windows Server 2012 R2 Server Standard
D2N9P-3P6X9-2R39C-7RTCD-MDVJX

Windows Server 2012 R2 Datacenter
W3GGN-FT8W3-Y4M27-J84CP-Q3VJ9

Windows Server 2012 R2 Essentials
KNC87-3J2TX-XB4WP-VCPJV-M4FWM