I looked online and here are the general guidelines:
http://www.fsis.usda.gov/factshe ... safety/index.asp#12
General Rules for Safe Use of Aluminum Foil (for microwave oven):
* Use new, smooth foil only. Wrinkled foil can cause arcing (sparks).
* Cover no more than 1/4 of the food with foil.
* Shape the foil smoothly to the food so no edges stick out.
* It makes no difference which side of foil (shiny or dull) is facing out.
* Do not place the foil closer than one inch from the oven walls.
* If the microwave oven has metal shelves OR a metal turntable, don't microwave food in foil containers or metal pans, and don't let foil used for shielding touch or be close to the shelves or turntable.
* If you see arcing (sparks), immediately remove the foil shielding; transfer frozen food from foil container to a microwave-safe utensil.
I suppose it's "OK" to use aluminum foil in microwave oven but i personally wouldn't do it cuz it seems a little too dangerous. 
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