The Microsoft cloud computing environment is the physical and logical infrastructure as well as the hosted applications and platform services. Global Foundation Services (GFS) team in Microsoft provides the physical and logical cloud infrastructure at Microsoft including many platform services.
Microsoft cloud platform services, such as infrastructure services, may be virtualized or actual. Platform services include:
Online applications running in the Microsoft cloud include simple and complex products designed for a range of customers. These online services, and the corresponding security and privacy requirements, can be broadly grouped as offerings for:
For more details, you can check the Global Foundation Services (GFS) website and the White Paper - Securing Microsoft’s Cloud Infrastructure.
Microsoft Cloud Computing Tools
Windows Azure is the development, hosting, and management environment of the Azure Services Platform that enables you to run applications at Internet scale while leveraging the skills and tools you use today. Windows Azure Tools for Microsoft Visual Studio extends Visual Studio to enable you to create, build, debug, run, and package scalable services on Windows Azure.
The Live Framework is the uniform way for programming Live Services from a variety of platforms, programming languages, applications, and devices. With the Live Framework, you can easily build and deploy applications in the cloud that sync across multiple devices. The Live Framework Tools extend Visual Studio to simplify end-to-end development and creation of Mesh-enabled Web applications. You can create, build, run, debug, and package these applications for the Live Desktop
more information at: http://msdn.microsoft.com/en-us/vstudio/cc972640.aspx