Hello Kim,
There are spam messages that Microsoft do not allow you to block as they are not considered as "bad actors" i.e. the email address has been cleared by the Hotmail filter as "legit" and 90% of these email addresses are advertisements from known advertisers and therefore you cannot "block" the email address, try it for yourself.
Point A: Why do they insist on putting them in my junk folder?
Point B: Why can I not block the sender?
Point C: If they are classified as "junk" and I can block other "junk" emails then why am I not permitted to block that particular email address, it's not normal behavior on the part of Microsoft.
The only solution to this is to permit the user to have the ability to block ALL incoming emails that they do not want or have not asked for. The automatic "report as phishing" is also ineffective at blocking unwanted email addresses as the same principle applies to advertisements from known advertisers. Gmail has this down to a fine art and I maybe get 4 or 5 spam emails a year. It means that YOU are in control of your inbox & junk box, period.
I keep getting the same spam from known advertisers and therefore I cannot "block" the email address nor does reporting it as "phishing" work = broken system due to simple lack of control for the end user, you & me.
You can also check if your email has been pwned if you are receiving large amounts of spam:
https://haveibeenpwned.com/
Cheers,
Peter