For better or worse, tech companies have to do a bit of product housekeeping every now and then. Today's Microsoft's turn to do exactly that. Most notably, the Redmond company announced it will be retiring its mobile apps for Photosynth, the platform it created to let people capture and view the world in 3D. While the applications, which had been available on Windows Phone 8 and iOS, are expected to continue to work for existing downloads, they won't be officially supported moving forward.