I just downloaded windows 10, and loaded windows live mail from Windows Essentials.  When I down load emails from Comcast server they appear in the inbox as they should, however they all disappear when I do the next download from Comcast server. I have already checked Message filters under View and "show all messages" is checked.   As a test, yesterday I downloaded 10 new messages from server and opened 5 of them and left 5 unopened.Today when I downloaded from the server all previously downloaded emails (5 unread and 5 read) disappeared. and only the new ones remained.  Can anyone tell me what is going on?

Tom