USDA and Microsoft announces Innovation Challenge for food resilience in the US

Cortana Now Presents A New ‘Surprise Me’ Challenge To Users

Maze Lamb, a cute and challenging puzzle game

Mi Challenge Alarm – Dare you take it?

Watch Microsoft’s Scott Guthrie Taking ALS Ice Bucket Challenge

Participate In Lumia 635 Challenge To Win A Lumia Device And $635 To Spend At Microsoft Store