the kindle 3 wifi still works fine, albeit you will need to connect to a 2.4GHz network with WPA2 or WEP, so not really that outdated. You must run the latest firmware version otherwise you won't be able to connect to wifi. So far as you log in with you amazon account, everything should work fine (except for the store, which you can no longer access from the device), you can purchase books and send them as normal and whisper sync should also work as normal.
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