June 21, 2011 – Through a mix of applications, software, storage and servers, public cloud computing will total nearly half of new net growth in IT spending by 2015, according to research from IDC.

Public IT cloud service spending is expected to more than triple from 2010’s compound annual growth rate to $72.9 billion in four years, swallowing up 46 percent of new IT expenditures, according to figures in IDC’s new release, “Worldwide and Regional Public IT Cloud Services 2011-2015 Forecast.” By 2015, IDC states that one of every seven dollars spent on packaged software, servers and storage offerings will be connected to the public cloud.

Of that anticipated public cloud IT spending, software as a service will account for about 75 percent, as spending on servers and storage will be prompted by SaaS providers expanding infrastructure, the research stated.

The U.S. will take up about 50 percent of that anticipated public cloud spending by 2015, though IDC foresees a greater increase in cloud vendors and spending in Asia and Western Europe than previously believed.

Frank Gens, senior vice president and chief analyst at IDC, noted that cloud services prod other disruptive technologies such as mobile, social networking and big data, all of which are creating a new industry split, according to a release with the research. Gens called this cloud-backed boom the “third major platform for long-term growth” in IT, likening it to the platform split between mainframes and terminals, and PCs in the 1980s.

“As during the mainframe and PC eras, the new platform promises to radically expand the users and uses of information technology, leading to a wide and entirely new variety of intelligent industry solutions,” Gens said.

Further out than 2015, cloud services are critical to transformative IT industry growth and changes during the next 25 years, IDC stated.

For the research, IDC forecasts the IT expenditures based on five functional categories within eight regions or countries. To access a copy, click here.

For another recent research perspective on the overall cloud forecast, click here.

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