I regularly freeze portions of food for my DCs (cottage pie, stews, pasta dishes etc). With my older DC (3), if I have forgotten to defrost the food peoperly, I have often put the frozen meal in the microwave and just zapped it till piping hot. This has never caused any food poisoning problems that I am aware of.
With DC2 (8mo) I try to remember to defrost the meals through the day, but a few times I have heated the frozen meal in the microwave also.
I mentioned this to a friend recently, and she was shocked. She said that she was sure you need to defost the food fully before putting it in the microwave. She was surprised that none of us had experienced upset stomachs as a result.
Have I been incorrect? Should I only defrost the food normally (e.g. in fridge), or should I defrost it in the microwave and then cook it, or have I been ok just heating it from frozen?