I have MS email account that associated with my Lumia (primary email) and Xbox live account. I am trying to disassociate phone from it. I know there is a way creating an alias but that will affect XBOX also. If i simply reset my phone and start it with a different email address it will do the job. However, as far as I know phone backup and all free and owned apps are associated with MS account not a phone number, so I will lose all that.. Anybody has suggestions?