Microsoft has made some giant strides in getting big social networks to hop aboard the Windows Phone bandwagon, but Pinterest has long been a no-show. Today, though, that changes: Pinterest has at last released an official beta app for its collection-themed service. You can do most anything you'd do on the company's mobile website, whether it's planning for a car restoration or making an itinerary for your next trip.With that said, it's not an ideal Pinterest experience... at least, not yet. The company tells us that the beta is a shortcut to its mobile web client with a few Windows Phone-native features thrown in. This won't be as tightly integrated with the platform as the Android or iOS versions, then. But hey, it's a start -- and Pinterest is looking for feedback, so you can let it know if you need more powerful tools for pinning your favorite things.