So the old laptop is now on Windows 10, and what gets me about it is that they've changed the whole thing all over again. I can't find anything! Thankfully they've put a search box in the bottom left hand corner because that's 70% of all I've done on the thing - search for how to do one thing or another.
Meanwhile since I bought this Mac the operating system has bene upgraded about three or four times. And everything is still pretty much in the same place. It means there's less radical changes and the screen tends to look more or less the same, but that's a good thing. It means you don't have the feeling that you are learning the whole thing all over again.