title: What is the optimum way to run multiple versions of Microsoft Office?
body: <p>I am being asked by more clients to build them Excel (and Office for that matter) add-ins. More often than not, these add-ins could be used across whole industries or at least for multiple clients.</p>
  
  <p>Unfortunately, different clients have different versions of Office. The minimum I've come across is Office 2010 and this has recently caused me a few problems as I am running Office 2016.</p>
  
  <p>I don't like the idea of installing multiple versions of Office on the same computer - it feels messy and I suspect library conflicts would be hard to avoid. So I am wondering whether multiple VM environments for each version of office would work or if that is overkill?</p>
  
  <p>Also, any idea how one procures old versions of office these days?</p>