Knuth wrote this six years ago and the war has already been won.<p>Google, Yahoo, and Microsoft all use "email" and if you Google for "e-mail" it says "Did you mean email?" and "e-mail" returns 3.2bn results in Google vs 5.9bn for "email".<p>I still use the "old" style though, mostly out of habit. But <i>really</i> old people I know still have the same old fashioned handwriting and language habits they picked up in the 1950s. It's not necessary to keep changing, though if you're a business, you need to stay on top of this if only for your customers' sakes.