Actually, without going into detail, the 2012 option was removed from the LC with the latest driver packs (v7.2.0), it will be re-added in early April with the 7.2.1 version of the OS driver packs (not SUU) 
I just got my PowerEdge t420, this is my first tower server, actually my first "real" server for that matter as before i just used an old pc to run all my needed tasks in the network. I found out just few minutes ago that i should install the OS through F10 (Lifecycle controller), so i clocked "deploy OS", but i can't find a "Microsoft Windows Server 2012", should i then click "Any other operating system" or am i doing something wrong? I know it supports MW Server 2012 as i had an option to buy a pre-installed Server 2012 OS, but i decided to get it clean so i can learn from the core on how to get it started up, but i just seem to not find the option.  Appreciate the reply
Is there a Windows Server 2012 option as OS somewhere in the options for t420?