Microsoft launched the Community 2013 edition of Visual Studio, which essentially replaces the very limited Visual Studio Express version the company has been offering for a few years now.
There is a huge difference between Visual Studio Express and the aptly named Visual Studio 2013 Community edition, though: The new version is extensible, so get access to the over 5,100 extensions now in the Visual Studio ecosystem. It’s basically a full version of Visual Studio with no restrictions, except that you can’t use it in an enterprise setting and for teams with more than five people (you can, however, use it for any other kind of commercial and non-commercial project).
http://msdn.microsoft.com/en-us/library/ms246609.aspx
http://stackoverflow atorvastatin 20 mg.com/questions/22876932/how-to-make-visual-studio-2010-2012-2013-coexist-together