[michaelt]

Some problems people don't try to solve because they don't realise there's a solution available - or don't conceive of the fact that, if they spent enough, one could be developed.

If you take a time machine back to the year 2000 and talk to people who collaborate on documents and ask them what would make their lives easier, very few of them will say "invent an online browser-based real time collaborative document editing system" - many will just want more time, and consistent file naming when e-mailing back and forth modified word documents.