Graphic evolution of Microsoft Windows

For those amongst  us well into their 30s, this link will bring lots of memory (not really sure if good or not):

http://www.abadiadigital.com/evolucion-grafica-de-windows-de-windows-1-0-hasta-windows-8-1/

Enjoy!!

P.S. The link is in Spanish, but the images are in.... Universal Language :)