I have a weid problem:

Two emails I sent some time ago are duplicated endlessly in my "sent" folder, but are not actually send to the recipients. So if I access outlook.com, my "sent" folder shows hundreds of copies of exact those two emails. Every few minutes new copies are generated with a recent time stamp. Now it gets totally strange when I access locally via Outlook 2010. Here those two emails and all of their clones have the exact time stamp of when I first sent them.

I am getting tired of deleting them, any help appreciated!