Using classic Outlook for Windows in business environments
Nothing will ever change if Microsoft doesn't enforce security rules.
We work with sendgrid at my place. We use all those securities when sending an email to ensure delivery and those emails can easily be marked as spam and then never arrived in your mailbox anymore because rules are followed.
But phishing emails and junks don't follow security rules of course. They are sent via known domains which are used for phishing. Microsoft could block those domains but they don't give a sh*t.
Outlook.com is clearly the worst email service of the Web.
I've been opening tickets at different Microsoft services and they always reply with the same stupid template.
It's really frustrating to deal with so many incompetent people.