Windows Phone 8 is nowhere to be found, making device launches meaningless and developers angry.

Microsoft has released the Beta 2 Refresh of Windows Phone SDK 7.1 (Mango) and also pushed and OS update for developer unlocked phones. Microsoft announced RTM of Mango update yesterday, however, this OS update is Build 7712 corresponding to the SDK release.

Microsoft Research has released a software-development kit (SDK) for the creation of Windows Phone 7 applications supporting the efforts of Project Hawaii, a student-focused initiative for exploration of how cloud-based services can be used to enhance the WP7 experience.