title: Version and UpgradeCode of Bundle vs Setup in WiX When Upgrading from VS Setup Project
body: <p>I am migrating some things from Visual Studio 2008 to 2012. One of my projects contains a Setup Project which is no longer supported in 2012. I decided to rebuild it in WiX 3.6. I have created a WiX setup project to setup my files and another WiX bundle project to bundle my prerequisites with the setup project. </p>
  
  <p>Now, I would like to have this setup project work seamlessly with previous installations if possible. For example, I have machines which installed version 1.0 on their systems using the setup.exe created by VS setup project in VS2008. Now I have compiled version 2.0 using the setup.msi created by WiX bundle project in VS2012. When the version 2.0 msi is run, I would like it to recognize that an older version of the same setup is installed and preform an update on that (or reinstall).</p>
  
  <p>So my issue is that each of the bundle and the setup project contains their own UpgradeCode and Version. Which one should receive the UpgradeCode of my version 1.0 setup? When I version now and in the future, do I version one or both of these?</p>