Hotmail scam fools Hotmail

This just arrived in my Hotmail inbox:

This Email is from Hotmail Customer Care and we are sending it to every Hotmail Email User Accounts Owner for safety. we are having congestions due to the anonymous registration of Hotmail accounts so we are shutting down some Hotmail accounts and your account was among those to be deleted...

It's a phishing scam, of course -- and a very crude one -- but how come Hotmail can't identify it as such and put it into the junk mail folder? Answer please, Microsoft?