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.
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.
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?
Also, any idea how one procures old versions of office these days?