For vNext it would be really great to have ApplicationData.RoamingFolder supported. It can enable some really cool and also cross-device experiences.
There is a feature in windows 8 for roaming application data which allows Windows 8 automatically transitions certain application data between user devices.
I suggest to have access to user's roaming data from WP8.
For example, user can play a windows version of a game as well as a mobile version of the game and scores will add up.
It looks like Microsoft is planning to do that but the functions are not implemented yet.
Thank you for your suggestion! I’m happy to report that support for roaming data is supported for WinRT apps in Windows Phone 8.1.
Even better, app data is able to roam between Windows Phone and Windows apps once they share the same PFN (Product Family Number).
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