The Gmail exporting feature is completely new and it will be gradually released next month. It will let you download a big MBOX file you can import in mail clients like Outlook, Thunderbird or Apple Mail. You can also use this feature to backup your Gmail messages and read them offline.
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"You can download all of your mail and calendars or choose a subset of labels and calendars. You can also download a single archive file for multiple products with a copy of your Gmail, Calendar, Google+, YouTube, Drive, and other Google data," informs Google.