Outlook it has started consistently opening to a new message window when I open Outlook instead of opening to my inbox.

When I open Outlook it has started consistently opening to a new message window which has  the address of the  last person I sent an email to.  I have to cancel it to see my inbox, but the next time I open up Outlook, the same new message is there instead of my inbox.  I have cleared my cache, history, and cookies and logged completleyl out but it still continues to open up in this new message window instead of my inbox. I even sent that message out, but it was back again when I opened Outlook.  How I can I get Outlook to open to my inbox instead of this message?