Do you want to standardize your Virtual Machine solution?
So you have been using Virtual Machines for a while and you now have the dilemma of having some in VMWare, others in Microsoft VirtualPC or VirtualServer and potentially Parallels or other formats.
Especially, if like some of us, you want to have a solution that is as flexible and powerful as VMWare workstation (creating images, snapshots, ....) w/out the license cost while being as simple to configure and run (if so required) as Microsoft VirtualPC. Well, don't despair!
Simply use SUN VirtualBox to use your existing virtual machines' images w/out losing some of the cool features and the ability to create new one Virtual images (unlike VMWare Player):
It natively supports the formats from VMWare (vmdk) and VirtualPC (vhd) including snapshots (as of VirtualBox 2.1.0*):
Of course, you could also use other techniques to convert the vmdk and vhd to vdi formats, but I will cover this another day ;)
* changelog from Virtuabox 2.1.0:
Dec 17, 2008. VirtualBox 2.1.0 released! Sun today released VirtualBox 2.1.0, a major update with exciting new features: among them better 64-bit support, hardware virtualization on the Mac, 3D acceleration, easier networking on Windows and Linux plus full VMDK/VHD support including snapshots. See the ChangeLog for a detailed list of changes.
Source: http://www.virtualbox.org/wiki/News