Let's start with the fact that there are business applications in the cloud typically referred to as SaaS. You can also purchase the infrastructure that supports those applications in the cloud, which is typically referred to as IaaS (Infrastructure as a Service). Two examples of IaaS are Microsoft's Windows Azure (soon to be rebranded Microsoft Azure) and Amazon Web Services (AWS). Both SaaS and IaaS can be delivered in a public, private, or hybrid cloud. So how do you know which cloud is best for you?
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