Fixing Google Apps Gmail’s “Too many Simultaneous Connections” error when using Postbox or Thunderbird

We recently switched our email client software from a mix of Outlook and Thunderbird to Postbox due to it's simplicity and responsiveness (we'd started to find Thunderbird a bit sluggish and Outlook was only used on a couple of PCs), after a few days we started to see authentication errors on our Google Apps email accounts with a error message of "Too many Simultaneous...
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