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Re:Why iCloud won't beat Dropbox and the failure of Airdrop by gburt on Sunday January 15, 2012 @06:41PM (#3468660)
Computers just don't show up, despite, as far as I can tell, being properly configured for it. It's probably a network settings thing (as I believe it is with BTMM). I've only used it on my local LAN though.
Re:Why iCloud won't beat Dropbox and the failure of Airdrop by Hoff on Sunday January 15, 2012 @07:31PM (#3468805)
AirDrop is a Mac-to-Mac connection, and works only between specific and supported WiFi-connected Mac systems. The connection is directly between Mac systems, and not via WiFi router nor AP.

Older WiFi devices don't support the necessary transfer mode.

Read the summary and features here:

  http://support.apple.com/kb/HT4783
If you want to venture off the trail:

  http://www.macworld.com/article/162407/2011/09/airdrop_any_mac.html
Re:Why iCloud won't beat Dropbox and the failure of Airdrop by Zirro on Sunday January 15, 2012 @07:20PM (#3468774)
I think it's only meant to be wireless. Also, it requires both computers to have the "Airdrop"-section in Finder open at the same time. And finally, it only works with Macs manufactured from some point in 2009, due to the specific hardware it requires. Would any of these possibly be the cause of the issue?