Why do big corporations use certain colors in their logos ?[part1]

Why do big corporations use certain colors in their logos ?
I am asking this question and hoping from a direct answer, but I'm 99.9% sure I will NOT get it... but you never know :P

My question is if these logos(Google, Microsoft Windows, Apple and many others) use these colors with a spiritual meaning, with a cultural meaning or some other occult reasons. I am not sure if it's a combination of all 3 stated above, but I'm sure all of them are doing it knowingly of what they are doing... My question is, do they bother to tell us also? or is it private information?

Maybe I haven't done enough research and this information is already freely given somewhere out there, if so please point me to it, leave a comment to this post.
Maybe the designers behind the logos have something in common, maybe not... who knows...

But why do ALL of these logos use all of the Rainbow(ROGVAIV) colors or somthing that suggests that, are they related to the energetic chackras in the human body ? Or is it just something to suggest multiculturality, globalization and wide range of services ?

This is a visual representation of the 7th chackra, the crown chackra in the human body,
the sahasrara :

Don't know anything about human chackras ? 

Here is a short introduction from wikipedia : 

The concept of chakra originates in Hindu texts, featured in tantric and yogic traditions of Hinduism and Buddhism. Its name derives from the Sanskrit word for "wheel" or "turning" (...)

So if it has something to do with roation...this is the same chackra representation rotating very very fast:

The Thought Chakra or Crown. It is located near the top of the skull and is our center for enlightenment. This Chakra presents us with the gift of cosmic consciousness allows and the universal flow of wisdom to flow freely through our being This is also the location where life passed into our physical body. Our souls enter into the body through theCrown Chakra at birth and leaves from here when we pass on. If unbalanced one may experience constant frustration, depression, and lack happiness and joy in life. When in balanced this Chakra grants us the ability channel the Divine and link our subconscious and unconscious minds.  SOURCE HERE

I will try this experiment with the logo's above(apple, microsoft, etc etc) ... subscribe with your email in the sidebar widget to see how they look like in a few days :)

e n j o y