Anecdote: Created new and unique Microsoft account 3 weeks ago with the sole purpose of testing w10, used it only ONCE to log into w10 vm. Started this VM today, logged into outlook and what do I see? 2 spam messages and one google news bounce.
How do you trust a company like that with any data?
I suppose you're implying that Microsoft sold your new account name to spammers? It could also be that you used a name that you, or someone else, have used at a different place and the spammers simply try sending mail to all the big email providers with that name in the hope of reaching someone. That would seem like a more probable explanation to me.
How do you trust a company like that with any data?