This might be a dumb question...but I'm setting up my friends 830 and she has no "Microsoft" account, does an MS account mean an MS email account ie. Hotmail, Outlook or MSN, or just an account associated with her Lumia 830 and MS ? In other words, can she use her Yahoo email account instead ? So when she signs into that Yahoo email account, when she backs it up and uses the Store and OneDrive etc., it will sync ?