I had the understanding that Time Machine was supported with 10.5.2 and the recent 7.3.1 firmware update. so that Extreme base stations with external (usb) hard drives could be used with Time Machine. I have not been able to make it work, and after one hour on the phone with tech support they told me that AEBS and the firmware update (7.3.1) ARE NOT supported with Time Machine!!!!! Is that true???? I thought the firmware update was to retro make it happen for us AEBS owners.