title: MSI Reference Counting: Two products install the same MSIs
body: <p>When products A and B each install several MSIs and some of the MSIs are the same, will uninstalling either A or B affect the other? Does install location matter?</p>
  
  <p>Also, what happens when common MSI C's version is higher in Product B and B upgrades C on install? Now uninstalling B will remove the common MSI C which breaks Product A. How do you handle this gracefully without using the Permanent flag? </p>