Yes Pyrex Glass Bowls and other Pyrex Cookware can be safely put in the microwave to heat up or cook food in.
Pyrex is rated for microwave use and even high temperatures in the oven but you don't want to put Pyrex Cookware on top of a stove burner because it could cause the Pyrex to crack or break.
That is unless the Pyrex is a Pyrex coffee pot then that would be safe to put on top of the stove.
I use Pyrex Cookware and Pyrex Bowls in my Microwave and it's been safe to do so for years.