When some emails are deleted from the Outlook (2010) Inbox on the workstation, they aren't being deleted on the iOS devices. This particular user has a 5GB Deleted Items folder and the iOS devices are set to display unlimited messages. Apple support blames Office 365 and says that it's an IMAP problem. I disagree since O365 portal shows him connecting via ActiveSync 14.1. I've not called MS yet. I feel it's because of the amount of email involved. Removing the email account from the iOS device and letting the email reload resolves the issue...at least until it happens again a month down the road. Any thoughts or advice would be greatly appreciated.