Someone mentioned that Windows 10 is pretty chatty, so I thought I would take a look. I don't have a Windows 10 machine so I borrowed my son's laptop and put Wireshark on it. I captured traffic for just under 15 minutes with no applications running.
There were 700k packets exchanged with 67 different public IP addresses. A total of 650MB was downloaded. I suppose nothing about Microsoft should surprise you, but I was a bit surprised!
I love Wireshark! You can do so much with it. As well as the normal view (below) there is a "conversations" view which splits the traffic by address.