VirtualCenter server is hosting other applications such as database servers, e-mail servers or clients, dhcp servers, web servers, etc.

VirtualCenter availability is critical since it controls and manages the entire virtual infrastructure. ESX Server will still function without VirtualCenter, however, management of the virtual machines is lost. VirtualCenter should be installed on a dedicated physical server or virtual machine, since running multiple applications on a VirtualCenter server poses an availability risk. Application programs such as web servers, databases, or messaging systems require a significant number of installed programs, active processes, and privileged users defined. These applications may provide a simple means by which a privileged user unintentionally introduces malicious code. Therefore, VirtualCenter servers will only run those necessary applications that are required to run the VirtualCenter service.