I understand that you have users profile associated with a windows live account, but what if you created that account a long time ago and it is a hotmail account. AKA you cannot change the email address. This is really frustrating because you are tied to that email address (which I never check) and I need alerts from forums to come to my work e-mail.
Maybe I am missing something. I would love to have an easy way to update the alert delivery email address.