Starting today, February 29, Microsoft will begin allowing invited developers to buy the Development Edition of Microsoft’s HoloLens mixed-reality goggles, which will start shipping March 30. In addition to including the HoloLens goggles and developer environment, the Developer Edition will come with a Bluetooth clicker; carrying case; charger and cable; microfiber cloth; nose pads; and overhead strap, Microsoft officials said today. The HoloLens developer environment includes the HoloStudio, a program for creating 3D in 3D; a version of Skype that will allow people to communicate using holograms; the Microsoft HoloTour holographic travel app; and three examples of mixed-reality games. More details: