DO NOT defrost meat in a microwave for various safety issues. This question was asked several months ago and la domestique had the best answer.
"In restaurants I've worked in we usually thaw frozen meat by placing it in a bowl and running cold water over it. You can turn the water faucet off and change the water every 15-20 minutes. It may seem odd to use cold water, but the idea is to keep meat out of the unsafe (warmer) bacterial growth temperature range. If you're trying to defrost steaks, this won't take too long, if you're defrosting a large roast, it could take more than an hour. Good luck!" http://food52.com/hotline/12302-how-to-quickly-defrost-frozen-meat
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"In restaurants I've worked in we usually thaw frozen meat by placing it in a bowl and running cold water over it. You can turn the water faucet off and change the water every 15-20 minutes. It may seem odd to use cold water, but the idea is to keep meat out of the unsafe (warmer) bacterial growth temperature range. If you're trying to defrost steaks, this won't take too long, if you're defrosting a large roast, it could take more than an hour. Good luck!" http://food52.com/hotline/12302-how-to-quickly-defrost-frozen-meat