> And it's all the client.

I believe the "client" in this case was "customer". Getting somebody to right click on a folder and selecting 'share in dropbox' is the easiest thing that I can ask of somebody. All files within that folder will be visible to me, even if they make changes.

Another key thing with dropbox is that it made sharing files easier by allowing you to share folders. I, for one, going through the attach -> browse -> open dialogue for each photo I wanted to show to somebody.