It's that Microsoft - like Google, Apple, Facebook and the other giants - routinely disconnects users for reasons it refuses to explain, and offers no meaningful appeal. Microsoft tells its business customers, "force your clients to get a Microsoft account in order to maintain communications security" but also reserves the right to unilaterally ban those clients from having a Microsoft account.
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There are examples of this all over. Google recently flipped a switch so that you can't complete a Google Form without being logged into a Google account. Now, my ability to purse all kinds of matters both consequential and trivial turn on Google's good graces, which can change suddenly and arbitrarily.
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