Is it "ok" to microwave cold coffee? I take my morning coffee with a side of multi-tasking. Packing lunches, making breakfast, eating breakfast, etc. Coffee gets made first, but sometimes I don't get around to drinking it until all the other stuff is done. That means sometimes the coffee is cooler than my preferred temperature by the time I get to it, and I'll stick it in the microwave for ~30 seconds for a quick warm-up. But I'm curious, is this some kind of "coffee sacrilege", or is a generally accepted practice/not going to mess up the flavor of my coffee appreciably?