It's also not the same thing as Dropbox was offering: that's a description of a network drive, but the key thing about Dropbox is that it's a syncing engine. It

It's also not the same thing as Dropbox was offering: that's a description of a network drive, but the key thing about Dropbox is that it's a syncing engine. It's a much harder thing to do, but with very big benefits: much faster (since it's just reading off disk) and offline access.