I don't remember... probably. I have 2 versions of WoW installed on that machine and I like to run both at the same time, allowing me to log in with both Dawill and Mimi at the same time to swap stuff back and forth. I could just alt tab, but the windowed mode lets me resize and see what's going on on both windows at the same time.

When I'm doin a raid or something I usually go full screen.