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My over the range microwave that came with the home I purchased 18 months ago blew up. I purchased a new one, however, I can not figure out for the life of me how the old one was installed as it isn't bolted to the cupboards above?? I am completely stuck and need to get this old one out so that I can install the new one. Any suggestions on how I may be able to get the old one out and how it may be installed, if not bolted from above?