I just picked up a shiny new Airport Extreme (Simultaneous Dual-Band II) that runs the latest firmware update 7.5.1 (also has 7.5 available). I'm trying to administer the new Airport Extreme from an old 12" PowerBook running OS X 10.4.11 . It has AirPort Utility 5.4.2 To administer Airport Extreme 7.5.1, the newly released AirPort Utility 5.5.1 is needed. However this is only for OS X 10.5.7 or later. Alternatively, AirPort Utility 5.5 is on the install disk that comes with the new AirPort Extreme, but this also requires 10.5.7 or later. I am unable to administer the new AirPort Extreme from my 12" PowerBook. Furthermore, I don't see anything written on the box that indicates system requirements must be 10.5.7 or later. This annoys me.