I came back to Parallels after quite a few years from when I first used it. It obviously just kept getting better and better. I have some old Windows programs that I still use quite often. I have loaded Windows 7, Windows XP, and a Linux computer with Parallels on my MacBook Pro. I had been using VirtualBox, but with every Mac OS upgrade, it would take quite a while for VB to catch up. The cost of Parallels was well worth having virtual machines that run so smoothly and look so good on my Mac.