In IE8, Tools > Compatibility View Settings > Uncheck “Display intranet sites in Compatibility View”.
Although this may come as a surprise for you, Microsoft does has a point doing that. In large organizations like governments, intranet applications that date back to IE 6′s omnipotency are very omnipresent. Thus, keeping backward compatibility by default on all Intranet websites is the safest choice to make. There’s probably more than a ten-fold difference between the amount of corporate intranet users and home intranet users.
