Echo Locker, the startup that makes a popular app for personalizing the lockscreen on Android devices, has been acquired by Microsoft. Echo Locker launched out of YC in our Summer 2013 class as Prim, and later turned its focus to the Echo product in July 2014. In an interview with Business Insider’s Matt Weinberger, Microsoft’s Chief Experience Officer Julie Larson-Green praised the Echo lockscreen app for helping take “productivity to the next level” and allowing users to stay “in the moment.” According to Business Insider, the Echo app will continue to be a standalone product for the time being, though its technology will be incorporated into future Microsoft products: “A lot of what Microsoft comes up with via the Next and Echo lockscreens