Microsoft Windows
This is very simple, and it has more to do with the philosophy and marketing of operating systems than the technology of the operating systems themselves, though the technology does matter a great deal as well. First, lets have a look at how this ransomware attack was allowed to happen to begin with.
The vast majority of affected systems in this latest world wide cyber attack were Windows based computers that were not updated with recently available and easily deployed patch. The attack did not affect other operating systems, and Windows systems that had a recently released security patch…