Correcting our slightly less informed counterparts – faux-pas too far in the modern office?

On receiving an internal email from a colleague containing a tragically misplaced apostrophe swimming about the word ‘its’, it got me thinking. While misplaced apostrophes are a heinous grammatical faux-pas, the art of politely but pertinently correcting an equal on abuse of the English language, appears to be an equivalently horrendous social gaffe.