Spam, Spam, Spam, Spam...
Around ten years ago I signed up for a browser-based Hotmail account just to see if the spam rumors are true. My username was a random 10-character alphanumeric.
No less than ten minutes after I'd finished signing up did I receive my first spam email. After that I received about 20 to 50 spam emails a day even though I never used that Hotmail account. Never sent an email to or from it.
That's Microsoft for you.