Version 3.0, formerly called Sun xVM VDI, came out more than one year ago.
At that time Sun introduced support for VirtualBox side by side with the existing support for VMware ESX. A odd choice considering that VirtualBox is a hosted virtualization platform (aka type-2 virtual machine monitor or VMM) and is not supposed to perform as well a bare-metal hypervisor (aka type-1 VMM) as ESX.
In March 2009 the Sun hypervisor, xVM Server, wasn’t ready for prime-time yet, so the company preferred to support VirtualBox rather than just stick with the competing platform.
Today Oracle introduces VDI 3.1.1 which comes with a major new feature: support for Microsoft Hyper-V.
The new build now supports VMware ESX 4 and VirtualBox 3.2, as well as Hyper-V 2008 R2 (including its VLANs).
Plus, Oracle has introduced support for Windows 7 as guest operating system (but only when VirtualBox is the backend virtualization platform of choice).
Sadly, still no trace of support for Oracle VM Server. Hopefully, the company will fix this as soon as Oracle VM Server 3.0 is out.