As far as I can tell, microsoft distributes this under a different license than the other true type core fonts. I think that you have to have a valid windows license to use this. I did this for a friend who wanted to use Tahoma in Breezy. The msttcorefonts package was already installed in this case. It is a prereq for this to work that you install the msttcorefonts package (to create the directory that we will use). You could modify this to use a different fonts directory, but this howto would not cover it).