Support for the XOAUTH mechanism has been deprecated since April 20, 2012, and will be shut down completely on May 5, 2015. You must migrate your applications to use the XOAUTH2 mechanism to avoid losing access to Gmail data. The OAuth migration guide explains how to convert existing OAuth 1.0 tokens to OAuth 2.0 tokens without user intervention.
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Last updated 2015-04-16 UTC.