A bit of info on rice - just in case you're interested
Brown rice is by far the most nutritional rice form available, so if you have a choice go for that instead! Owing to the severe milling and polishing process (i.e. refinement/processing), white rice is often devoid of practically all it's vitamins and nutrients.
For a while now, a lot of effort has been made to increase Asians' health by encouraging them to consume unmilled/unprocessed rice. Unfortunately, the population generally prefers white rice to brown. As a result, general malnutrition and beriberi are still very common in those regions. Another plan was to enrich white rice with the lost vitamins and minerals. However, owing to the expense and practicality of doing this, eating brown rice still makes better sense (and is healthier).
Why? Well, for a start, brown rice is a quality source of the vitamin B1, B2, B3, and B6. Other minerals include manganese, iron, selenium, magnesium - all vital metals for a healthy diet. Additionally, (and quite important for those interested in low GI/Protein sources) it actually includes a good supply of protein and something called "gammaoryzanol" (I had to look up how that was written!

). It's an extract of rice bran oil - it's been used to address digestive, menopausal, and cholesterol problems. Hence why people say eating brown rice can lower cholesterol. Also, it has been shown to exert growth promoting properties as well (not sure if it's related to GH releases or not though).
If you compare it to wholemeal/wholewheat, brown rice is actually quite nutritious, in terms of calories, nutrients etc... Wholewheat/wholemeal, does have a greater protein content (by about 3%) as well as fibre (by about 7%), but in terms of quality, brown rice has a better protein/EAA profile - i.e. a more complete protein.
Just some food for thought.
As for cooking it in the microwave, you do have the potential of destroying some of the benefits in the rice (transforming/breaking down protein strings) owing to the high energy transmitted by uwave radiation - however, I'm not a microbiologist and cannot quantify that. For the effort of steaming/boiling the rice, and the fact I don't own a microwave, I'd still choose to do it the "old" fashioned way.
Not really helpful in answering your question but thought I'd add it in there.