I just upgraded one of my Zimbra servers to 7.0, and everything went cleanly except I'm having an issue with the default font for the web client. I'm not sure what font it is, but it is almost unusable on some clients. Different browsers/platforms offer marginally improved appearance but even on IE8/Win7 it shows up as a non-antialiased font with spacing problems. Oddly enough the admin interface is fine, and the font is clear and properly aliased, so this is only on the client interface.
Is there some place I can change the default font? I have looked through the admin panel but don't see anything. Here is a screenshot of what I'm talking about: