My computer is MacBook Pro Late 2011 Mavericks v10.9.5

Some days ago I created an item but not sent it. I waited untill the next day and saw doubl saved item under the Drafts Folder.

I opened one of them, edit it and push the "send" button. The other item (1 item 1 unread in the status bar) got empty on the preview pane

but I could not delete it...  Although I rebuilt the "main identity" nothing has changed.

Can anybody help me to solve the problem of deleting any item in drafts folder?

Please see the images...

Actually I have also another question (perphaps it has relation with the first question):

Some times, when I open the Outlook from the dock for the first time (i.e. after reboot the computer or after quitng applicatio)2 (two) separate windows are opening and I am closing one of them to continue my work. I couldn't find the reason.

ertpoy