Retargeting a Windows 8 application to Windows 8.1

Apparently, fuck Windows 8. So says everybody. Including Microsoft. That's why at some point you're going to have to retarget your Windows 8 app (if you were crazy enough to make any) for Windows 8.1. Fortunately, Microsoft provides a guide for doing so in Visual Studio 2013 here. Fortunately, it's as simple as right-clicking on your solution in the Solution Explorer and clicking on Retarget for Windows 8.1

Making TFS builds consistent with desktop builds when invoking MSBuild directly on a .*proj file

As it turns out, MSBuild has more than a few quirks when being invoked through TFS compared to being invoked through a command line or from Visual Studio. Some of them are pretty well documented. Others are not, like the fact that in a .*proj file, the OutDir variable is inherited to sub-MSBuild tasks.  There's also quirks because OutputPath is used to determine OutDir, but not in all cases. If you're going to specify OutputPath in the properties when invoking the MSBuild task, you should also explicitly override the OutDir variable as well to ensure consistency, unless you **TRULY** understand the differences between the two and how MSBuild determines OutDir, and you **REALLY** want it to be that way.