The convenience and speed with which cooking can be done in a microwave oven is truly impressive. Many people even use the microwave to boil water for a quick cup of tea or coffee. You should however be ware of a dangerous thing that could occur when you try to boil water in a microwave oven.
It is highly advisable to place a wooden spoon or even a tea bag along with the water in the microwave oven. Technically the water in the microwave gets superheated, this can prove dangerous if there is only water in the container that is placed in the microwave oven. A slight jerk or movement to the vessel with water that is superheated can cause the water to 'burst' out of the vessel.
There have been cases of accidents reportedly caused by boiling water in a microwave. If you can avoid it, use a stove or other heating decide to boil water. But, if you must boil water in a microwave oven, read the report on this topic at this link: http://www.health.food-recipe-cooking.com/boiling-water-in-a-microwave-01.htm