I've noticed on the PC that has only ever had windows 10 on, during the update to the creators upgrade all my dns settings and (lan) static ip settings were all set back to 'obtain from...'. I had to re-enter them in. Not a big issue but I just happened to notice it when trying to diagnose another problem.
Interesting the computer that upgraded from Win7 to Win10 kept the details, and also the laptop coming from Win8, Win8.1 to Win10 kept the details too.