Migrate Visual studio solution to SharePoint 2013

Context :

A company migrate from moss 2007 to Microsoft SharePoint 2013

Objectives :

We are going to present how to migrate visual studio solutions, from MOSS2007 to SP2013.
For info, to migrate a MOSS2007 solution to SP2013, you need to migrate it to SP2010 first.

Notes : If you don't have the visual studio solution, you can import it with CKS Dev Extension for visual studio.