Hi Mandy,
When Outlook is running, right click on the lower right hand corner where is says sending message... and select cancel/send receive. Once this is done, you should be able to delete it from the outbox. If you still can't, set outlook to not send messages automatically and then restart it. You should have no problems deleting it then though it may take a bit to delete it if its really big.
Hope this helps!
Danny
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