Desktop as a service adoption lags behind on-premise VDI, but the popularity of cloud-hosted desktops is growing. Here's a look at the top DaaS providers and their services. Desktop as a Service (DaaS) is a virtual desktop infrastructure (VDI) hosted in the cloud and paid for as a subscription service, usually charged for by the seat.

Link: Top desktop as a service (DaaS) providers: Amazon, Citrix, Microsoft, VMware, and more
via http://www.techrepublic.com