I am sure there are many more corporate installations of Windows XP than Windows 10 (Tellers, bank machines, retail systems etc etc).
That doesn't mean rolling out XP is good - and it...
Why do you want to sync with your desktop - I can only assume that you have a phone and would like the portable nature of data access that happens when you use it with your phone vs. your PC!
I think there is only time for 1 build - which will need to be completed by the end of June. I suspect this build will then be patched prior to July 29th.
Bags are packed - Ready to go!
Follow your conviction, sell your house, car and dog and sell short some sort of Microsoft options. You will either be very rich, or living in your parents basement.
Either way you'll move...