Warning: You might not want to change this email address if you've used it to set up a Windows Phone 8 (or earlier). On your ...

Warning: You might not want to change this email address if you've used it to set up a Windows Phone 8 (or earlier). On your phone, features that use this address will stop working, including Marketplace, Xbox Live, email, and others. To use these features again on your phone, you'd need to restore it to factory settings, which erases all personal content.