I already managed to create function which checks if user is using a trial/demo or full/purchased app on Windows Phone 7.
Is it possible somehow to know if user has reviewed or rated a current app?
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I don’t believe this is currently possible, you may be interested in this blog post regarding reminding the user to leave a review for your application :-
http://igrali.wordpress.com/2011/12/24/bug-prompt-users-to-leave-you-reviews-and-rates-on-windows-phone-marketplace/
http://roybott.com/blog/getting-ratings-for-your-wp7-app.html
You could try the following :-
http://mikaelkoskinen.net/post/Marketwatcher-WP7-Class-Library-and-Sample-Application-for-Fetching-Application-Reviews-from-the-Marketplace.aspx