Cloud computing, which enables information and communications technology (ICT) capacity to be used over the network, is entering a genuine expansion phase for enterprises as an effective means of reducing up-front investments and using ICT more effectively. One Cloud service, infrastructure as a service (IaaS), enables the use of virtual machines, virtual storage, and virtual networks on an as-needed, when-needed basis. IaaS can be used by many enterprises regardless of their type or scale of business and can be used in either a public, virtual-private, or private format. Fujitsu provides IaaS through its "on-demand virtual system service" with easy-confguration, on-demand, and self-service features designed for enterprise use. This service enables enterprises to use ICT resources in line with their business strategies and to free themselves from hardware lifecycles. However, enterprises must become familiar with application-development techniques applicable to virtualization and distributed processing. As enterprise ICT expands to include clients and customers, the use of Cloud services is becoming indispensable to business.
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