Got a new computer, old one died.  Installed Windows Live Mail 2012.  Was using an older version on the old computer.  Copied all my old emails from my ISP's web site into WLM.  Now I'm stuck with THOUSANDS of emails I can't delete!  I can delete any new emails that I've received.  I suspect the problem might be going from POP3 to uh, whatever the four character one is called!  Any ideas?  Thank you.