The original Airport B card can connect to WPA networks, but only if the OS is 10.3.9 or higher. It is one of the very few B cards that is able to connect to a WPA network. If it is having problems connecting to a WPA network, check your router's wireless mode. If it is set to B/G/N on 2.4Ghz, it may not connect. Try setting it to B/G and connecting. Some router's 2.4Ghz N modes don't play well with the Airport card.