Has anyone got a workaround for this? Annoyingly it keeps failing to deliver cloud emails. It isn't a generic IOS 5 bug as my iPad seems fine. I can't replicate the problem as it seems random but both times it happened following on from changing the default number of messages from 50 to 100. Although this could be a red herring. I've tried lots of combinations to try and fix, from turning push on and off, to changing it to fetch, to disabling iCloud email and re-enabling to sending a iCloud email or doing a manual fetch (which of course brings in missing emails). Incredibly frustrating.