Microsoft is definitely running on Azure. I can't imagine AWS is doing anything different. https://www.pcmag.com/article/364611/microsofts-cloud-how-the-compan

Microsoft is definitely running on Azure. I can't imagine AWS is doing anything different. https://www.pcmag.com/article/364611/microsofts-cloud-how-the-company-eats-its-own-dog-food https://www.pcmag.com/article/364611/microsofts-cloud-how-th... > Guthrie said Microsoft has long had a tradition to "eat our own dog food," which means it runs its own systems on top of the same software it offers to customers. Microsoft IT was an early customer for Office 365, Azure, and Dynamics 365, and has moved the vast majority of its internal servers to Azure, including its SAP implementation, payment systems, and test systems. This has helped Microsoft learn what it takes to run the technology on an enterprise scale.