This decision is now forcing me to get rid of Office 365 Online for Business.
I have... for some time been running my own mail servers for my own and friends domains, all of us are semi-professional, in that... our domains are intended to define US online and not a business, so the inability to use "personal" services on a business account has now come to a head as things like Windows 10 require personal account registration. Family members now want to play games on Xbox for example. I'm sure there was a reason for this decision, but ultimately when i complain about these issues on User Voice which is where i always get sent they don't get the kind of attention they need to be resolved. Which is a shame because i otherwise love the exchange online product for its general simplicity at low level and power to do much greater things. All of which become pointless if this is the only mail server out there, that actively locks my ability to choose which services i can sign up for with my personal email address because you think I'm a business. you've locked yourself out of an entire use case which i cant imagine will do anything but grow over the years.