Microsoft certifies itself -- and Firefox doesn't like it

I've chuckled at this a few times, decided today to share my mirth:
This is the alert message I get when I visit the IEBlog with Firefox, due, I'm guessing, to the fact that Microsoft issues its own security certificate, when possibly it's not authorised to do so. Firefox does not like that. ;)
Of course, one must wonder about the need to secure the IEBlog anyway. It's not like it's passing anything unique or of critical importance down the line, certainly nothing that should need securing.

A better suggestion would be to secure the rest of the net from IE -- now that's security I'd like to see.