Font Questions

[Dave Feustel <dfeustel mindspring com>]

Is there any difference between using "iso" and ISO" in font names?

How can I tell whether font ISO-8859-1 is installed or not?

If iso-8859-1 is not installed (which seems to be the case since
email specifying that iso-8859-1 is used do not display all character
codes as glyphs (in mutt Mutt 1.5.18 (2008-05-17) ) ), from where
do I download the font and how do I install it.

Thanks Very Much.