Is it legal to use Windows without activate? And is it legal to buy key from place other than Microsoft Store?

[WayneGUO1]

Is it legal to use Windows without activate? And is it legal to use it, and bought the key, but the key will not ship to my place in 2 weeks, and I keep using it for 2 weeks, then activate it? And is it legal to buy the key from amazon? (I know those $5 ones are illegal, but what about some for $119?)

For example, this: Amazon.com

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