This is one of those bizarro situations that leads me to wonder if it is just our install that is somehow broken. After an upgrade to 5.0.9 NE, our users have found they can't click on the "From" column header in the web interface to sort their messages by the sender. Other headers are clickable (Date, Subject, etc), but From remains recalcitrant. This functionality is kind of important to our users.
I've tested this from both Safari 3 and Firefox 3 (with clean caches), both behave exactly the same. Is this a real bug I should file?