VirtualBox is a general-purpose full virtualizer for x86 hardware. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software.

VirtualBox is a general-purpose full virtualizer for x86 hardware. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software.

VirtualBox 2's guest additions provide better display drivers, mouse pointer integration, seamless windows, and more. If you're doing much work in a virtual machine you should have them installed.
VirtualBox 2's guest additions have been improved over older versions.

I’m running a few Ubuntu virtual machines for testing new software. My favorite virtualization software, VirtualBox, is much easier to use with the additional drivers (called “Guest Additions”) that allow higher screen resolutions, better display performance, and mouse integration. For Ubuntu 8.04 guests, I had some issues installing the guest additions using VirtualBox 1.5.6 OSE.

To activate the fullscreen mode in a virtualbox machine, we need to install Guest additions in the guest OS. If you are testing Ubuntu 10.10 Maverick meerkat in virtualBox , you may notice that guest additions are not working, it seems that the problem is the new xserver they put in ubuntu10.10, the modules are not build against this new version (See screenshot bellow).

VirtualBox is a family of powerful x86 virtualization products for enterprise as well as home use. Not only is VirtualBox an extremely feature rich, high performance product for enterprise customers, it is also the only professional solution that is freely available as Open Source Software under the terms of the GNU General Public License (GPL).

This guide explains how you can run virtual machines with Sun VirtualBox 3.1.x on a headless OpenSUSE 11.2 server. Normally you use the VirtualBox GUI to manage your virtual machines, but a server does not have a desktop environment.

This guide explains how you can run virtual machines with VirtualBox 4.2 on a headless OpenSUSE 12.2 server. Normally you use the VirtualBox GUI to manage your virtual machines, but a server does not have a desktop environment.

Running a server as a guest in a VirtualBox virtual machine isn't much good when you can't network with the guest OS from your host machine. Instead of setting up host interface networking, you can simply port forward though VirtualBox's NAT. Once port forwarding is set up, any computer on your network will be able to network with your guest OS though forwarded ports on your host.