I have a hotmail throwaway account (it has since been migrated to outlook with the microsoft buyout) and its spam filter is completely backward. There is currently 373 e-mails in my inbox (100% spam, expected since it is a throwaway...) and 4 e-mails in my spam folder--100% of them the account registration/confirmation e-mails that I was wanted.

I have migrated to fastmail for all of my personal e-mail, which I have been pretty happy with. So far I haven't caught any legit email which has been categorized as spam and negligible spam that has made it through into my inbox (mailing lists notwithstanding--I sort them using automation rules). My one complaint is that there is no way to turn off their "thou shall not receive executable attachments" filter so I still need people to play the "set windows to show the file extension, change it to .txt, and then attach it" game when people want to send compiled code via e-mail.

In any case, it is certainly a much better situation than the gmail spam filter I used while in school, which had about a 10% chance of marking outside messages as spam--in fact it even started marking e-mails sent by my professor (via the university gmail) as spam...