If you overheat eggs the proteins overcook and toughen up, throwing out water as they tighten. Making scrambled egg in a microwave will never be as successful as making it in a pan, properly and slowly so that you can see and feel the changed in texture as it cooks. However, if you are prepared to cook it a few seconds at a time on a low micro setting, stirring each time, you might just get something semi-edible at the end. It will, however, completely defeat the object of using the microwave as a speedy cooking method, as it will take nearly as long as making it properly, in a pan, with a spoon. Your call, but I know which I'd prefer...