I believe guys that microwave's work by heating/boiling any water in the microwave. By that notion then boiling is at 212F and THC breakdown starts at 375F I believe. That would make it pretty hard to kill your THC in the microwave. My only doubt is about the plate you put it on. If the plate were to heat too much then its heat could kill your THC.
BTW, There is in fact a study out there that concludes that cooking your bud turns a compound THCa into THC. But that regular smoking it was at too high of a temp to allow that reaction to take place. There is also a well known recipe book out there that always recommends pre-baking your cooking stash at 200F, I think it says for an hour.
This topic is already covered some where on this forum, That is where I learned this.
I've tried it on tons of friends, They all said that they liked sample B better. little did they know sample B was just sample A microwaved. :jointsmile: