Engadget published a review on Windows Phone 7.5 Mango

Let's face it: Windows Phone, as we know it, has an enormous amount of potential, but it's a first-generation operating system. For the first eleven months of its existence, it's lacked many of the common features we've come to enjoy (and take for granted) on Android and iOS, but then again, even those platforms have taken their turn getting the major wrinkles ironed out. So it comes as no surprise that Microsoft's mobile darling -- the innovative rebirth of a weak and faltering Windows Mobile platform that was quickly falling into obscurity -- would need to go through a similar process.

It's finally time for Steve Ballmer & Co. to unleash its major annual update (not counting NoDo here), codenamed Mango, to a litany of devices both old and new. Also known as Windows Phone 7.5, the latest build delivers an onslaught of features -- no less than 500, according to Microsoft -- many of them we've been missing dearly. Three months ago we were given the opportunity to preview the new revamp and ogle over its smattering of new capabilities (see the full list of features here), and it's only proper for us to offer a follow-up with the update's final build. So how does the completely polished version hold up against the mobile juggernauts, not to mention its own first-gen offering?

  Windows Phone 7.5 Mango Review