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Cloud computing services bought in by companies are estimated to make up over 10% of the spending on external IT services worldwide, according to analyst Gartner. This illustrates that firms are already looking to the cloud to support new IT service delivery models like software-as-a-service (SaaS), platform-as-a-service (PaaS) and infrastructure-as-a-service (IaaS). Some observers even argue that many firms are moving to an “everything-as-a-service (EaaS)” model using the cloud.