History has a funny way of repeating itself, or so they say. But it may come as some surprise to find this old cliché applies just as much to the history of computers as to wars, revolutions, and kings and queens. For the last three decades, one trend in computing has been loud and clear: big, centralized, mainframe systems have been “out”; personalized, power-to-the-people, do-it-yourself PCs have been "in"; Before personal computers took off in the early 1980s, if your company needed sales or payroll figures calculating in a hurry, you’d most likely have bought in “data-processing” services from another company, with its own expensive computer systems, that specialized in number crunching; these days, you can do the job just as easily on your desktop with off-the-shelf software. Or can you? In a striking throwback to the 1970s, many companies are finding, once again, that buying in computer services makes more business sense than do-it-yourself. This new trend is called cloud computing and, not surprisingly, it’s linked to the Internet’s inexorable rise.
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