i would think so most new bake ware can
Yes, you should be able to use in your microwave, if they are oven safe. as Pyrex is.
They should say so on the bottom of the dish itself.
On the bottom of the glassware it should say if it is safe. Most now will say Microwave, oven, freezer safe. Some you can use on the stove top some you can't.
The information is stamped or embossed on the bottom of the pan.
If it says that it is safe for the microwave then yes you can. Make sure that you don't put the hot glassware on a wet surface afterwards as some of them have exploded - they changed the materials that they make glassware from in the past 10 years and some of them aren't as strong as they used to be. Put the hot casserole on a folded dry tea towel or dry trivet.