VMware has long had an aversion to supporting virtualization tools other than its own, even as rivals like Microsoft and Citrix happily built management software that could control the deployment of virtual machines using both their own hypervisors and VMware’s. VMware always had a plausible excuse in that its own vSphere virtualization platform was so widely used that supporting anything else was unnecessary—although Hyper-V’s advances are making that argument less convincing.

via VMware realizes it doesn’t rule the cloud, boosts support for Amazon | Ars Technica.