Please see the following screen shots. As you can see there are two "overfull" hbox there. However, LaTeX does not produced any overfull box warning at all. I tried to produce a minimal working ...
I am using XeTeX from TL2010 with microtype 2.5 beta and fontspec. My main font is Linux Libertine O. I do not see a single difference with and without including the microtype package. Am I doing ...