Should I warm wine in the microwave?
According to Spanish winemaker guru the Marqués de Griñón, you can safely warm a bottle of wine to serving temperature (12ºC-14ºC). Put the microwave at high for two seconds for every ºC you want to raise the temperature.

Also here

Edit: I looked up the reference in his book. It says to heat a bottle out of the fridge (where stored after opening) in the microwave for two minutes at low.