You've got questions about Corningware, so why not let the manufacturer answer them? Corningware Consumer Information Center: Consumer Care Center
1200 South Antrim Way
Greencastle, PA 17225
Call 1-800-999-3436 (North America).
(Monday-Thursday 8:00am-6:00pm, Friday 8:00am-5:00pm Eastern Time)
If they don't know, who does?
Bon appétit!
I use mine in a conventional oven all the time. Works like regular corningware.