title: Outlook Addin Error: Not loaded. A runtime error occurred during loading of COM add-in
body: <p>I have created an VSTO Outlook addin. The configuration is as follows:</p>
  
  <ul>
  <li>Visual Studio 2008 </li>
  <li>Office 2007 Outlook add in (3.5 Framework)</li>
  <li>MSI created using Visual Studio Setup Project</li>
  <li>Deployed to Office 2010 under windows 7</li>
  </ul>
  
  <p>It works fine on the Dev PC however it fails to load once installed on the test machine. The outlook addin window shows a <code>"Not loaded. A runtime error occurred during loading of COM add-in"</code></p>
  
  <p>It is my understanding that I should not need to install any PIA as the Office 2007 PIA are part of Office 2010.</p>
  
  <p>So far I have tried the following:</p>
  
  <ul>
  <li>set <code>VSTO_SUPPRESSDISPLAYALERTS</code> however it does not show any messages when it tries to start.</li>
  <li>configured <code>Fuslogvw.exe</code> (Assembly Binding Log Viewer) however it is not showing any binding errors.</li>
  <li>set <code>VTSO_LOGALERTS</code> and it is logging all alerts however as none are shown this has not helped.</li>
  </ul>
  
  <p>Is there anything I am doing wrong or need to do in addition to make this work?</p>