1284 right now, 72 unread.
Lotus Notes stats indicate that I receive/send (mostly receive) on average between 1700 and 2500 work-related emails a week, and I need to archive at least once, sometimes twice a day. I have a very bittersweet relationship with my Blackberry...
I archive almost everything (never know when you might need that paper-trail), but at the end of each year, I delete everything that dates back more than 2 years.
Overwhelmed by such numbers, superiors and staff get priority. I do have a few colleagues I watch out for, because they usually have important stuff. Everybody else? If it's that important, they'll track me down in person. Even if I'd spend just 60 seconds reading the other emails and writing back that I can't tackle their issue right now, I'd spend 3+ hours just doing that.
Mars