I just did a fresh install of Karmic Koala, and had a very unexpected issue.
When using Outlook Web Access Light 2007 new items were not showing ion bold text.
Even though I had installed the Microsoft True Type Core Fonts (installable via synaptec as ttf-mscorefonts-installer) I was still seeing the issue.
It turns out that even though I did have the font "Tahoma" which is used by OWA light, it was not displaying Tahoma Bold correctly. this was true in other apps as well, not just Firefox. I reinstalled the corefonts, and refreshed the font cache, no dice.
I guess that MSCorefonts does not include a bolded version of tahoma, which normally gets created on the fly by the OS.
Well this was not working for me.
so I did the following:
downloaded the fonts in cab format:
put it in a NEW folder your home folder. open the terminal, and then enter:
cd (new folder you just made's name)
(this will extract all the file into that folder.)
sudo mkdir /usr/share/fonts/truetype/tahoma
sudo cp *.ttf /usr/share/fonts/truetype/tahoma
then rebuild your font cache
sudo fc-cache -f -v
you should be all set at this point (and please let me know if any of my commands are wrong, I'm going from memory here)