Analyst firm, Enterprise Management Associates (EMA) reveals significant benefits to enterprises when using Network Security Policy Management (NSPM) solutions, while organizations without, experienced issues including non standard security policies and failed cloud migrations
You can download the 2013 version for free at http://www.visualstudio.com/en-us/downloads. You can leave your 2008 edition installed if you want, they are completely independent.
They do not separate the different languages as they used to do, but they do provide different versions for different types of development. Simply download all the ones you need, they merge together if you install them all. The only difference between the different editions is the templates and editors that come with each one.
Just be aware that the edition labelled "for Windows" requires Windows 8 and is useful only to develop applications for the new Windows 8 interface. If you want to develop for standard Windows application, you need the edition "for Windows Desktop".