VirtualBox is flexible enough to handle many types of 32-bit and 64-bit configurations. If you need to run a 32-bit version of XP in a 64-bit host, you can do that without any problems.

Sun has updated its VirtualBox virtualization software, fixing bugs related to Windows 7 and Snow Leopard.

Although we're using Windows 7 64-bit as our base OS, VirtualBox runs on nearly any OS, and these tips and tricks are applicable to any serious VirtualBox setup.