MScorefonts are still used in many places from web pages to word documents.
Fedora / Redhat doesn’t ship them by default, but you can download rpm’s from http://sourceforge.net/projects/mscorefonts2/files/rpms/ and install with:
$ sudo yum localinstall msttcore-fonts-installer-2.6-1.noarch.rpm
Thank you ask.fedoraproject.org