May 14, 2021 The worldwide public cloud services market, including Infrastructure as a Service (IaaS), System Infrastructure Software as a Service (SISaaS), Platform as a Service (PaaS), and Software as a Service (SaaS), grew 24,1% year over year in 2020 with revenues totaling $312-billion, according to the International Data Corporation (IDC) Worldwide Semiannual Public Cloud Services Tracker. Spending continued to consolidate in 2020 with the combined revenue of the top five public cloud service providers (Amazon Web Services, Microsoft, Salesforce.com, Google, and Oracle) capturing 38% of the worldwide total and growing 32% year over year. Thanks to an expanding portfolio of SaaS and SISaaS offerings, Microsoft now shares the top position with Amazon Web Services in the whole public cloud services market with both companies holding 12,8% revenue share for the year.