We are tied to Microsoft due to a multi-million dollar ERP. I have frozen at Win 8.1 (software assurance contract). I love server and maybe once Server 2016 is out this Fall/Winter, I can circle back around but the 2 Win10 machines we have (one is mine) tripped every security protocol we have (we do some stuff for foreign and local defense contractors). Thi sis the enterprise edition. In the end, I block a few thousand domains and entire netblocks within and without our networks which completely breaks Cortana, Store, etc. along with just about every Microsoft website. It's a pain. I'll be moving back to DragonflyBSD ASAP on my desktop and running VM's whenever I need to hop into Windows.