All Microsoft’s operating systems from 7 to windows 10 are now available for VirtualBox, Vagrant, Hyper-V, VMware (Windows and Mac), Parallels (Mac). Notes The founders and developers of Kali Linux have generated alternate flavors of Kali using the same build infrastructure as the official Kali releases. VMWare, VirtualBox and ARM architecture Kali images produced by offensive security can be found on the official offensive security Kali Linux virtual images and offensive security Kali Linux ARM images pages respectively. #1- Download and install VirtualBox, Create any virtual machine of any Operating System. I am demonstrating for you Kali Linux 2016.1. #2- After creating a new virtual machine, it is time to import the OVA (Open Virtualization Archive) file. Press Ctrl+ I or Navigate to file select import appliance. Find the OVA file and import. #3- In this step, you can watch complete settings of the OVA file If you desire you can change. I am only changing the name is from Kali-Linux-2016.1-vbox-i686_1 but I am changing it to Kali Linux 2016.1, When your work is done click import, it will import all of them in 3 steps. #4- Now it is time to “Power ON” the virtual Machine and let’s enjoy the pre-installed virtual Machine in our VirtualBox. #5- Here you are at login Page of Kali Linux 2016.1. Remember by Default Its “Username” is “root” with a Password of “toor”. It was the really the easiest method to install an OS in any virtual Machine, Don’t Forget you can try other OSs in other Virtual Machines too without losing too much time. So here it’s my suggestion to you, ask me about it if you didn’t get.