Seeing as how you're on HN you may have heard of 37Signals, Fog Creek, and Atlassian. All sell products which are domain-specific improvements for email. They collectively have, conservatively, X00,000 paying users. These are small companies in this problem space - IBM has at least 48 options for I-can't-believe-it's-not-email at every price point between $200k and $200 million. Ditto Microsoft and a dozen other big software companies.
"The web" includes a bunch of stingy twenty something's on the consumer Internet, but it also includes the producer Internet, and the producer Internet is one giant system for turning piles of money into bigger piles of money. Something which makes that happen is cheap at any price.
"The web" includes a bunch of stingy twenty something's on the consumer Internet, but it also includes the producer Internet, and the producer Internet is one giant system for turning piles of money into bigger piles of money. Something which makes that happen is cheap at any price.