That would be Server 2012. Took me months to figure out how to restart it via the GUI.
I actually came to like the 8.1 Start screen, though it took awhile. Basically my most-used programs are pinned to the start screen, so I can tap Windows, and use the mouse to select one, with a large margin for error. Or I can search based on the name of the program, and unlike Windows 10, it's only to match local items, and not include any web results.
Or, maybe the Win8 one was better. It's a bit hard to be sure about this, but the first half of the comment stands.