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Microsoft's virtualization technology is known as:
Hyper-V
ESXi Server
CentOS
VMWare Fusion
vSphere
CentOS is the opensource version of Red Hat Linux Enterprise. It's one of the most popular enterprise focused Linux distros.
vSphere is VMWare's virtualization platform. It had the highest market share of any virtualization platform.
ESXi is an opensource linux implementation of a virtualization platform.
Hyper-V is the name of the Microsoft virtualization platform. It has the second largest market share.
VMWare Fusion is the mac virtualization platform.
EDIT: ESXi is the VMware native hypervisor; sets of ESXi hosts are managed by vSphere (which is expensive). ESXi is free to use by itself.
https://community.spiceworks.com/networking/articles/2462-server-virtualization-and-os-trends
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