> Quick-cook porridge in microwave ovewn: 200 ml water
> and 100 ml quick-cook poeeidge oats in a micro-safe
> dish. Microwave at full power (700 W) for 2 min and
> stir.
> Can I replace the water with milk?
> Or in other words
> Can I substitute milk for the water?

Yes. Things to note: milk boils over quicker than
water, so you want to use less energy and a longer
cooking time. It also separates and gets that
interesting scum on top, so you want to interrupt
the cooking for a stir more frequently.

> I've never tried using quick-cooking oatmeal or preparing hot cereal in a
> microwave oven. But it seems to me that ground or rolled oats need to absorb a
> certain amount of liquid. Recipetor haven't specified the butterfat content of
> the milk in this case. If receptor prefer skim milk at 1,5-2,5% it may not get
> the same result someone else would at 3.2%. At any rate, it figure milk is
> probably less easily absorbed than water.

That would be correct but is easy to allow for.

> I'd suggest you begin by substituting 10 ml of milk for the same amount of
> water, and if it like the result keep increasing the proportion of milk in
> similar increments until you find you don't like the result.... :)

Not sure whom you were originally talking with, 
but my suggestion would be to use all milk but
not full power, testing at intervals. Even
better, just use the stovetop.