The dishes and bowls can go in the microwave to reheat food. I recommend short settings (1-2 minutes), stir, and add more time if necessary. I don’t use them for microwave cooking, as microwave heats food unevenly. Long setting will create uneven hot spots that may cause thermal shock, leading to cracks and breakage.  I recommend not putting glass dishes in a regular oven. They are sturdy, but they are not Pyrex. The uneven heat from the hot metal rack may cause thermal shock.