A recent report estimates that large companies lose nearly $2000 per employee in productivity due to spam. Despite increased technology, workers' email accounts are being flooded with unsolicited messages. Some workers report spending nearly 15 minutes each day dealing with an average of 29 spam messages, up from seven minutes in 2003.
See "Report: Spam Costs Are Rising at Work", David McGuire, The Washington Post, June 6, 2004