Sun’s VirtualBox is an extremely handy (and free) tool to use for virtualising operating systems inside your current OS. It is one of the best free virtualisation tools available, making it a great solution for those who don’t want to pay for programs such as VMware Workstation.
VirtualBox runs on most of the popular operating systems that are available today including Windows, Mac OS X, Ubuntu, Fedora, OpenSUSE, Debian, Solaris, Red Hat and more. You can virtualise most Linux distributions as well as most versions of Windows (both DOS and NTFS); Mac OS X is unsupported unfortunately. We installed VirtualBox 3.1.2 on our Windows 7 32-bit machine and wrote up a guide on how to get an OS running inside a virtual machine.
I just wanted to comment on this and say one thing. On my VirtualBox I have to actually press the button to take a screenshot (PRTSC SYSRQ) to unlock my mouse. VirtualBox tells me it is the Right Ctrl button that unlocks it but that never works for me.
I’m using Ubuntu 9.10 and I have run both Windows XP and Ubuntu 10.04 in my VirtualBox. Both of them do this to me.