I have public windows phone app with version 1.0 for windows 8 - Now I have to do version upgrade to version 2.0 for the same app and users should get notifications for the same. - Should I use the same reserved app name as version 1.0 or use another app name for version 2.0 - What will happen if I submit app with version 2.0 and the same app name? - Do I have to use another app name for next version? Or same app name will work?
You dont need to do anything with the App Name Reservation. The app name should be the same irrespective of the versions/update.
Your existing users will get notified via Updates only when you update your existing app. And if you reserve a new name(for your version 2) and publish it, it will be published as a new individual app and so your app will not be listed in the Updates List of your existing app users.