What is the recommended way to share data between a Windows Store App and a Windows Phone 8 App?
Hi,
You could save the data to the third server. And then get or rewrite data with winjs.xhr + web service.
#WinJS.xhr function (Windows)
http://msdn.microsoft.com/en-us/library/windows/apps/br229787.aspx
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You can save it to your database server which could be on a shared hosting or use Azure cloud or use SkyDrive for backup and restore. More on how to use skydrive for data.
http://www.coderewind.com/2012/08/how-to-integrate-skydrive-backup-in-windows-8-app/
Daniel CodeRewind.com