Managing personal Outlook.com account settings, security, and privacy
Well I am a tech savvy person, having worked most of my career in IT (and sadly as such kind of a MS fanboy) and so it seems apparent to me that Microsoft is either 1) unable/unwilling to address the issue due to how their systems are architected/operating 2) are getting kickbacks from spambots or 3) don't care about their users.
I've been complaining about this issue for years and have never seen a serious attempt by MS at addressing the issue. They always reply with the same old weak suggestions, like have you tried to set the rules and filters, blah blah blah. Man, I've been using Hotmail for 25+ years and it's insulting when they say that to me. Come on Microsoft, do something about this issue!