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    Interestingly the API spec also models contacts and calendar objects and allows for submitting mail. This is already deployed and in production use at FastMail.

    There are FM people answering questions over in the HN thread.

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      It’s a bit sad that ActiveSync is the only widely supported sync protocol for mobile mail and calendaring.

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        Though, I have to admit, it works remarkably well on my company-issued phone. Setup is also dead-simple.