Microsoft: evolution of the logo

How often has Microsoft changed their logo?
Above you can see the revolution of Microsoft during the years. The first logo existed till 1979 and the first time they changed it was in 1980. In 1982 they changed the logo again. The color stayed, just the design changed. The fourth logo was the logo that hasn't been changed for the longest time, from 1987 till 2012. From 1975 till 2012 all logos hadn't got a special color, just the letters have been changed. The actual logo of Microsoft was created in 2012, it is the first colorful logo of Microsoft. All at all Microsoft has changed his logo 4 times, lets see how it will go on! My favorite logo of Microsoft is the actual, because it's the most conspicuous one.