Yes, They Are THAT Important
Our enterprise spam filter has been down for about a day as we reconfigure some servers here. It has been just this side of crippling, especially travelling and getting spammed to death on my Treo.
Spam filters have become good enough (though still not perfect on the false positive side, of course) and prevalent enough, that I had forgotten just how important a role they play in today’s corporate IT environment. We’d be in really sorry shape without them!