Not sure if everyone is getting this, but if I use 'Search Windows', my PC always attempts to contact a-0001.a-msedge.net (seen and blocked by Peerblock). Cortana has been disabled on this machine, but it still tries to connect.
Yes, it makes a connection even if you disable Cortana, Bing searches, etc. I didn't care to look into it further before blocking indiscriminately. I doubt PeerBlock will catch all IPs they use, though, so be aware of that.