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Jan 27, 2014 4:49 AM in response to xMRSTEVIExby a brody,A lot of older iMacs only support the original Airport, and not Airport Extreme. PowerPC (PPC) iMacs that have extreme are limited to 802.11g, and can't do 802.11n. Those with the original airport only support 802.11b, and the insecure WPA/TKIP or WEP encryption, and are better served via ethernet to a WiFi ethernet bridge.
The airport card typically is not built-in. Verify with http://www.everymac.com/ what the status of your iMac was, and/or see this article:
http://support.apple.com/kb/HT2256
Intel iMacs that are Core2Duo can be upgraded to 802.11n with the 802.11n enabler. You'll have to contact the Apple Store online nearest you to determine if you can still download it, as it is not on their website.
To determine if you already have it, see this tip:
http://www.engadget.com/2007/01/30/apple-busts-out-1-99-802-11n-enabler/