The March 22, 2016 deadline is just for Wi-Fi or Wireless (if you have 2G/3G support) update of the Kindle Firmware.
2012 and earlier Kindle’s, UNLESS they have new software, will be UNABLE to receive UPDATES over Wi-Fi or Wireless. Basically after March 22, 2016, unless you have new software, Internet connection is not going to work.
Not the end of the world. Kindles can still be UPDATED via a PC. Download the Kindle software to a PC and then transferring it to the Kindle via a USB connection.
To be fair, if you miss the update THROW away your old Kindle! Get a decent Android Pad and you can still read all your Kindles. Amazon knows what you had and you can download the books again from the cloud.
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