An estimate vendors and analysts often repeat is that about 80 percent of computing power running corporate applications still sits inside corporate data centers (as opposed to running in the cloud or in colocation data centers). Chasing that still enormous growth potential, cloud providers, from raw compute and storage to subscription-based software in the style of Salesforce or Office 365 have been pouring billions of dollars each quarter in both building and leasing data centers to host those services.
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