2 e-mails exactly the same

I'm running Vista Business and Microfoft Office 2007 with Outlook

I have just started receiving 2 e-mails excatly the same. I'm also (not sure
if it's connected.) getting a grey Microsoft Outlook dialouge box that keeps
asking for my Network Password. (I'm not on a network) I entre the only pass
word I have click save with other passwords and off it goes, only to come
back again 15 mins or so later..and so it goes on.

Any ideas please?
--
Ian D Anderson