I have noticed a VERY troubling bug! Under certain circumstances if i reply to an email from my iPhone i can see the icon showing i replied to the original email, but it is not being delivered and it does not appear in my outbox, my drafts, or my sent mail folder! This seems to be when i reply to an email when i am out of signal (e.g. on the underground) where i would expect the email to be queued up and send when i am back in signal range. My setup is an iPhone 4S using gmail connected via exchange active sync connection (m.google.com) Has anyone else experienced this?