Like most mobile carriers across the globe, AT&T has embraced Linux — in fact, the Linux kernel powers the Android platform. But AT&T recently surprised a lot of people by turning its back on Microsoft and adopting Ubuntu as its cloud, enterprise, and application solution provider. In addition, Canonical (the company behind Ubuntu) will provide support for these platforms/solutions.
This should serve as a clear indicator as to what platform has become the clear winner in the race to the sky: Ubuntu (as it is the number one cloud platform on the market). In fact, 80% of large-scale OpenStack deployments run on top of Ubuntu. Ubuntu is also a large player in the Amazon and Microsoft cloud space. From this point on, when you think cloud, you should think Ubuntu.