According to Engadget, Angry Birds developer Rovio Mobile is less than happy with Microsoft. For a while, apparently until the developer complained, Microsoft was using the Angry Birds icon in their Windows Phone 7 marketing campaign. Rovio Mobile responded angrily:
They later added that developing a Windows Phone version is not out of the question, but that it’s not currently planned. Whether or not this was mistaken or cynical on Microsoft’s behalf, it highlights how important it thinks apps will be to the success of its platform.