Microsoft’s big goal with Windows 10 is to encourage developers to create universal apps that run across PCs, tablets, and phones. The software giant now has a big ally: Facebook. At Microsoft’s Windows 10 devices event in New York this morning, the company revealed that Facebook is creating Windows 10 apps for Messenger, Instagram, and Facebook. “Facebook is all in on Windows 10,” according to a quote attributed to Mark Zuckerberg. An official Facebook app"Facebook – Desktop App for Windows 10 Released"