I was in a bus station in Mexico and needed a booking confirmation email. Unfortunately it was below the list of cached threads and I didn't want to pay for data. My old windows phone saved all emails that had been read (emails are tiny) we need that on gmail on android too, the cache is too small at the moment. We can't rely on always having a data connection. Is the only solution to duplicate all gmails by setting up gmail as imap/pop as well on the same handset?