I am running Windows 10 on a PC.  I was using Windows Live Mail and tried to move it to the side so it would use half the screen.  Instead it disappeared.  The WLM icon appears on the taskbar and indicates when new mail comes in.  But when I double click on the icon nothing shows up.  when I point to the icon, a small window opens with the mail, calendar, contacts list, but it still won't open when I click on the mail.

Does anyone have a solution to this?  I have tried restarting my computer, but nothing works.