Most Certainly not mate, no... OEM i am talking about.
May not be Legal in the eyes of the Microsoft Police but it is far from a problem.
At my last place of work, we maybe called MS 40 times a day to activate an OEM Lic. usually a LIC of a dead laptop onto a new PC the Client bought as a replacement
Which is against the license.
For some reason people believe there is this "grey area" which really there isn't.
An OEM license cannot be transferred from a laptop.
It cannot be transferred from the motherboard it was first installed on.
Sure you can physically do both of the above - however as said above you are no more license legal than somebody who downloaded their OS illegally.
If you're going to be illegal don't try and invoke a "grey area" that doesn't exist - just pirate the OS and have done with it.
I need a driving license to drive a car.
If I don't have a driving license and get in a car and attempt to drive what happens?
That's right, I can drive, the car goes, nothing stops me.
I am however driving the car illegally.
What you can physically and legally do are two different things.