Is it possible to create a storage provider for user data on a Windows Phone device? <p>The <a href="http://msdn.microsoft.com/en-us/library/microsoft.phone.userdata.storagekind%28v=vs.92%29.aspx" rel="nofollow"><code>Microsoft.Phone.UserData.StorageKind</code> enumeration</a> <em>implies</em> that "other" storage locations can exist for storing use data, such as appointments and contact details. Is it possible to create a provider that can be installed as part of an App (such that the data becomes aggregated in a similar manner to that from Twitter, LinkedIn, Facebook, etc.)?</p>