Why does making instant coffee in the microwave taste burnt? First off, I did see this question about reheating the coffee in a microwave oven, but the answer merely suggested that stale coffee tastes bad irrespective of the microwave.

I make instant coffee a lot, and whenever I use the stove to boil my milk and add coffee, it turns out fine. But if I am lazy and use the microwave to boil the milk and then mix the coffee, more often than not, the coffee tastes burnt. So burnt that I've had to throw it away.

This isn't specific to one particular brand of instant coffee, I have tried 3 brands.

I've noticed that it seems less burnt if I put it in the microwave for lesser time, but I like my coffee piping hot in the morning and it doesn't turn out well.

So what is it about microwaving instant coffee that makes it taste so revoltingly burnt and what can I do to avoid it?

EDIT: I do microwave the milk in short bursts so as to avoid burning the milk. And also, if I just microwave the milk for the same amount of time, the milk doesn't taste burnt.
It could be that the milk is getting so hot that it burns the coffee granules when you add them. Liquids can boil in the microwave without bubbling, because the inside surface of ceramics are often so smooth as to have few nucleation points. Try leaving the milk to cool for a minute before adding the coffee.