I am using Office for Mac 2011. I have a message that has been stuck in my Outbox for 6 mos or so. When I try to delete the message, Outlook locks up totally unresponsive. I have waited over 30 minutes to see if it comes back with no avail. I have to Force quit Outlook. The message is still there.

Any help on being able to delete this message?
I have 3 emails in my Office Mac inbox that stubbornly will not allow themselves to be deleted or moved to folders.  Each time I try to take a move or delete action, Outlook freezes up and I have to force quit the program.  How do I get rid of them?