What is the difference between VMware vSphere Hypervisor and VMware Server?
Both VMware vSphere Hypervisor and VMware Server are available for free. However, VMware vSphere Hypervisor is the recommended free solution for customers looking to get started with VMware virtualization. vSphere Hypervisor is an enterprise-class virtualization solution that offers the bare-metal architecture for near-native performance, features like memory overcommit to increase consolidation ratios and a cluster file system for managing virtual machine files on shared storage. VMware Server, on the other hand, installs as an application on Windows or Linux, relying on the operating system for resource management. This limits the performance and scalability. Virtual machines created using VMware Server can run on VMware vSphere Hypervisor, in some cases they must first be converted using the free VMware Converter.