But that's precisely the point - the only thing that can force businesses to upgrade is if the cost of developing, testing and maintaing software for IE6 become

But that's precisely the point - the only thing that can force businesses to upgrade is if the cost of developing, testing and maintaing software for IE6 becomes more than what it costs to do a full overhaul and re-education. Microsoft stepping in to make IE6 support easier and cheaper simply sends the message that it's still a valid choice for development and support.