Original title: Delete unwanted messages

I am running Windows Live Mail Version 11 on Windows 10 operating system.  I have 14 messages that were sent to my email account on 6/1/16 and 5/31/16.  These messages cannot be deleted, moved, etc. from my inbox.  Error Message box says "unknown error occurred."   How can I get rid of these messages.  Seems like the junk mail (?) sort was not working on these days.