[yutah]

Google would not give up the ability to see email content... maybe they would analyze them locally on your phone instead of on a remote server (that might even save them from buying a few server too)

[magicalist]

This is part of End-To-End[1]. There's no way for their code to see the email contents, even locally in the browser. That's the whole point, in fact.

[1] https://code.google.com/p/end-to-end/

[yutah]

If you can see your emails on your Android device and Google is admin on your device, why do you say that it is impossible for them to read your emails? I don't mean that they could read them in the cloud but if they can read them locally on your Android device and for example they could send a message back to Google saying "I think this guy should get ads for a new router".... but of course they could do much worst (they could send whole messages back for example).

[sp332]

But isn't keyword-based advertising their only revenue source from non-"Apps for Business" accounts?