Just a quick note: I have updated the templates for Visual Studio that help you to create the skeleton code for Add-Ins with a view clicks. Now you can also use Microsoft Visual Studio 2012 . Visual Studio 2012 is supported by this same template installation.
Please find the download here:
NAV 2013 Tool – Add-In templates for Visual Studio 2010 and Visual Studio 2012
The express versions of Visual Studio unfortunately do not support those templates.
Christian Abeln Senior Program Manager Microsoft Dynamics NAV