First the bad news: I'm still blocked from logging-in to my Hotmail account, unless I provide my day, month and year of birth. I have however found a back-door access to my account by signing-in to MSN and clicking on the mail icon.
I created my account over 20 years ago when the big internet related corporation weren't mining personal data from its users. Things have since changed and personal information has become very valuable and that is why, in my opinion, MSN is asking for my birthdate.