Since I upgraded to my desktop PC to  windows 8.1 from windows 8, I am finding my email system (Hotmail) does not sync with my other devices which include 2 apple ipads and a laptop which uses windows Vista.   Before I upgraded there was no problem, all synced fine.

Also even when I am using the desktop, I find that despite it being set to download messages as they arrive, this is not happening, and sometimes it takes hours, whereas on my other devices it is immediate