[rand49an]

Perhaps you don't but these are critical features in many businesses. The company I work for does government contracts where we have 3000 line cost models that are shared by 6+ organisations and maintained by 20+ people with daily updates. Without having them accessible by everyone at once, people would be creating daily copies which would need to get reconciled.

[LukeEF]

it still has locks thou - unless you use the less powerful online version. Would be better imho to have a lock free desktop version of Excel that operates like an IDE where you merge changes and resolve conflicts at the point of merge.