25 Years ago Microsoft released its first version of then-GUI Windows 1.0. I let you enjoy a screenshot of how it looked back then and compare it with where we are standing right now!
No question how instrumental Windows has been in the ubiquity of Personal Computers. I'm not old enough to remember but I've heard when OSIsoft was making the decision to provide PI for PCs, many people in the industry thought that would be an absolute waste as "the PCs are just toys" and "no one is going to use toys in a plant"!
To read more on the history of Windows see this nice article.