Windows Live Mail

I was sending out several emails with attachments.  When I tried to close out the messages were still in the outbox. A message popped up asking if I wanted to send these messages and I said yes. I closed out. Now when I try to go back to my email I get a box that shows that 1 of three messages is being sent and that it is executing the task but it is stuck and not processing and I can't get into my email to go in and try to delete the messages. How can I get into my email? Please help.