Windows Azure is a Microsoft cloud computing platform used to
build, host and scale web applications through Microsoft data
centers.The platform consists of various on-demand services hosted
in Microsoft data centers and commoditized through three product
brands: Windows Azure (an operating system providing scalable
compute and storage facilities), SQL Azure (a cloud-based,
scale-out version of SQL Server), and Windows Azure AppFabric (a
collection of services supporting applications both in the cloud
and on premise).
Windows Azure Storage utilization is calculated based on your
average usage during a billing period of blob, table, queue, and
Windows Azure Drive storage. For example, if you consistently
utilized 10GB of storage for the first half of the month and none
for the second half of the month, you would be billed for your
average usage of 5GB of storage.