...only inbound to Hotmail! No-one else.
I can assure you that my non-Hotmail email provider does this too.
And even worse - it doesn't move spam to a "junk" folder, it just silently deletes it.
And this is because I've configured it this way, because I want it this way. There's no way I'm going to look at a spam folder every day to see if there are any real messages amongst the thousands of spam, so they might as well be deleted immediately rather than cluttering up someone's disk for a fortnight.