Does anyone know offhand how to remove the guest additions for VirtualBox 3.1 in Ubuntu 9.10? These are the additions that provide mouse integration and X drivers for automatic window resizing.

It is the first thing you need to fix the issue as stated above. For that, you need to run the virtual machine showing the error and go to the Devices > Install Guest ...

Sun is adding support for the Open Virtualization Format standard to its VirtualBox software. Can it become the free or cheap solution that takes away market share from VMware Workstation? As Sun ...

I just read a press release from Sun Microsystems that presented VirtualBox 3.1 and its virtual machine migration capability, dubbed "Teleportation" by Sun. This product offers some interesting new ...