Using outlook (hotmail) I've had a grand total of one spam email make it to my inbox this year. All the rest has landed in the spam folder.
I can't think of anything that's been incorrectly flagged as spam either...
I get far more spam calls and texts than I do email spam. Android filters out spam sms pretty well, but not much I can do about calls (especially with spoofed local area codes). Just pick up, wait for a 'hello' from a person and immediately hang up when text-to-speech starts babbling at me instead.