title: namespace Visualstudio does not exist in the namespace Microsoft, missing assembly reference
body: <p>I inherited a C# Visual Studio 2010 project that I am unable to compile because it’s looking the following reference which I am unable to satisfy. </p>
  
  <p><code>using Microsoft.VisualStudio.Tools.Applications.Runtime;</code></p>
  
  <p>I am new to VS but from what I have researched it has something to do with the version Microsoft Office and the .Net framework version.  I currently have MS Office 2003 installed (with Project 2010 and Visio 2010).  The Solution requires .Net 4.0 but from what I found on the web it looks like MS Office is reverting .Net to an earlier version.</p>
  
  <p>When I type in <code>using Microsoft.</code> Intellisense only shows </p>
  
  <ul>
  <li>{}Contract  </li>
  <li>{}CSharp</li>
  <li>{}Internal</li>
  <li>{}SqlServer</li>
  <li>{}VisualBasic</li>
  <li>{}Win32 </li>
  </ul>
  
  <p>So I am missing the <code>{}VisualStudio</code> resource.</p>
  
  <p>Thanks.</p>