It&#x27;s not just Windows.  I have an enormous investment in iPhoto -- lots of curated albums with comments.  iPhoto won&#x27;t run in newer versions of MacOS, and Photos won&#x27;t run in older ones.  So I&#x27;m looking at an event horizon: once I upgrade past Mavericks there&#x27;s no going back, and as long as I&#x27;m on this side of the horizon there is no way for me to know if Photos is going to successfully import my photo albums or not.<p>This has happened before.  When Apple dropped support for Rosetta after Snow Leopard I lost the ability to run a wide variety of useful applications.  I still fire up Snow Leopard in a VM now and then just to run one of those apps.  (BTW, running Snow Leopard in a VM is a non-trivial thing to do because Apple&#x27;s license specifically prohibits it, and Parallels enforces that restriction.)