Hello, I'm on extended travel away from my PC and would love to update my Lumia 900 with the latest Tango version. Does anybody know if this can somehow be done without Zune, perhaps by downloading directly via WiFi from Nokia or Att? Thanks!
No, at this point all WP7/7.5 devices must be hooked to Zune to receive software updates. WP8 is supposed to bring over the air updates, but that doesn't help you any right now.