A number of Microsoft's own services -- including Office 365 business, Office 365 consumer, Bing and Xbox Live -- are not running on its Azure cloud backbone. They are still running on their own custom stacks and datacenters.http://www.zdnet.com/article/microsoft-is-on-a-quest-to-move...
Certain, newer pieces of some of these services, such as the Azure Active Directory service at the heart of Office 365 and some of the newer, complementary Xbox Live services are hosted on Azure.
Certain, newer pieces of some of these services, such as the Azure Active Directory service at the heart of Office 365 and some of the newer, complementary Xbox Live services are hosted on Azure.