The VirtualBox makers have described the process for Windows and Linux users in a FAQ post, and I've described the virtual-Windows-inside-Linux process in more detail in our guide to running ...

You can dual monitor with VirtualBox virtual machine or guest OS. To be able to use VirtualBox on Multiple Monitors with any virtual machine, you need to change the default settings.

Learn how to convert VMware to VirtualBox or convert VirtualBox to VMware virtual machine by following this easy tutorial.