IDC (a sister company of Network World) bases its Worldwide Public Cloud Services Tracker on multiple factors, including public filings, vendor interviews and survey results, end user surveys and analyst estimates. The Tracker only takes into account pure IaaS, so it does not involve application development platforms, SaaS apps and other non-virtualized, single-tenant hosted services.
Until cloud revenues are more robust, don’t expect vendors to willingly break out their financials. In the meantime, we’re left with these rough estimates.
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