Google To Retire Email Migration API November 1 2015

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If you're using EMAPI v2 Google says it's going to retire it later this year. There's plenty of time as it's not until the beginning of November before it's ended.

EMAPI v2 will be turned down on November 1, 2015, so you should switch to the Gmail API soon. Google To Retire Email Migration API November 1 2015 [googledevelopers.blogspot.com]

Going forward, we recommend developers integrate with the Gmail API.