Just finally did the free upgrade to Windows 10 from Windows 7.  I had been using Windows Live Email 2012 and it worked fine in Windows 7.  Now in Windows 10 it seems to connect fine and pulls email down from my Comcast server, but anytime I try to Reply to, or Forward, or create a new email, I get the same error message:

I did not knowingly change any account settings and looking at them seems like they are the same as they have always been.  Any help that will maintain all my existing files and folder structure would be greatly appreciated.

Thanks!