When it comes to apps - even the big ones - it's fair to say that Microsoft's Windows Phone platform often gets left behind. It took an age for Instagram, for instance, to make its way over to the WP Store, and even when apps do finally manifest themselves, updates can be few and far between. Spotify is another prime example, and although an official app has been around for a while now, the ability to shuffle songs for free with ads has not. Now, though WP users can listen for free thanks to a new update, and if you don't mind the occasional advertisement, it's a great way to enjoy free music.