How do I cancel sending an email in my outbox?

I use outlook and I was sending an email with a big attachment. I just decided to not bother sending it but i can't cancel it. It won't let me delete it or do anything! Help me please!|||well there's a few things you can do, although I'm somewhat unfamiliar with outlook. First off, exit the program, and do not save. If that does not work (which It almost 100% will), you can save it to a draft, and then delete the draft.