The Xolo Win Q900S acts as a gate pass for Xolo into the Windows Phone sphere. With a weight of just 100 grams, it is being promoted as the world's lightest Windows Phone 8.1 based smartphone and it is just 7.2mm thin. It is currently competing against the likes of Micromax Canvas Win W092, Canvas Win W121 and Nokia Lumia 630. It might be a great option for those who want to move on from Android to Windows Phone platform. The Xolo Win 900s runs on Windows phone 8.1 operating system, which is home to a lot of great social networking, instant messaging, shopping, imaging and productivity apps such as Facebook, Twitter, WhatsApp, Hike, Microsoft Office, OneDrive, HERE Maps, IRCTC and MakeMyTrip.