One of the biggest (and arguably somewhat deceptive) issues with Cloud licensing is this:
Once users are created they are automatically counted towards billing even if they don't accept the invite or log in. A user must be explicitly deactivated, deleted, or removed from a synced user directory (if you have Google sync) to not count towards billing.
Well... that's nice. You could wind up paying many times what you should be because accounts were created for people who, for whatever reason, aren't using them - AND there is no way to identify these users via the GUI.
So how would people go about identifying inactive but technically 'active' users so that they can deactivate the right people?