I looked at the Visual Micro site (http://www.visualmicro.com/) and apparently the Express Editions don’t work. Ugh. Only VS 2008-2013.
If only Arduino had made their stuff build with a normal makefile. OK, maybe I’ll spend a bit of time here trying to get this to compile with the Atmel Studio (which is free). In the mean time, if you happen to have one of the full versions of Visual Studio, have at it!