I estimate that I can identify 99.5% of spam by the subject line alone. I don't know why its such a hard problem, and why renewal notices for Norton 360 Premium sent to "Customer" from a random gmail address keep passing as legitimate email.

Hell, just block all emails mentioning Norton 360. Wouldn't be any great loss to the world.

But what I don't understand is MS letting these through the spam filter but randomly, in a thread between myself and another person both using MS account emails, sending a single email in that thread to spam.