The number of emails sent or received daily by the typical corporate employee is expected to rise to 136 by 2017 from 121 this year, based on projections released last November by the Radicati Group, a Palo Alto, Calif., market-research firm. Managers, who receive the most, are "flooded by email," says Nancy Ancowitz, a New York business communications coach. Many a manager multitasks to get through it all, "emailing from a mobile device at a stoplight, typing with his thumbs," Ms. Ancowitz says.
Some bosses don't answer at all. Nearly one-third of 700 employees surveyed by researchers at Florida State University said their bosses had given them "the silent treatment" in the preceding year, according to the 2006 study.