title: Uninstall an MSI with msiexec fails with new version of MSI
body: <p>We are installing several web sites using msi's as part of continuos integration tests.</p>
  
  <p>For each build we want to uninstall the old msi and install a new one.</p>
  
  <p>Problem is we do not have the old msi after the build server has done a get latest and rebuilt the system.</p>
  
  <p>Is there a way in which we can uninstall the msi without having access to the orginal msi?</p>