- User Tim moves folder to User John's Drop Box.
- User John moves folder to John's desktop.
- John cannot edit folder contents.
OS X doesn't change the ownership, even though the act of moving to John's Public Drop Box is an indisputable transition of ownership.
This behavior has been broken since 10.0.
I'd be pleasantly surprised if it were fixed in 10.5.
This ain't rocket science.
The old Apple would have nailed this one long ago.
[Yes, I know how to change permissions. That's not the point. This is 'not caring' style design.]