Have noticed a bit of an odd issue. iPhone 6, iOS 9.2. I have a few mail accounts -- iCloud, Outlook.com (which has been moved to the Office 365 infrastructure), and an organization's Exchange account (Office 365). I have noticed that in the last few days, read status does not synchronize. That is, when reading messages in Apple Mail on my laptop (OS X 10.11.2 / Mail 9.2) or in the webmail interface, their read status does not sync in the background to my phone. The unread badge continues to say "1" when I've read that single email and/or marked it as read in either of the above. This is true for the Exchange accounts which should, and used to, do so. I'm aware that iCloud does not support this, as much as many of us wish it would. Mail does push to the iPhone without question. It's just the read status updating that's not happening. What I have already tried: - Manually removing and re-adding the Exchange accounts in question, as Exchange, with autodetection of settings on the iPhone; - Hard reboot of the iPhone; - Verification that accounts and folders in question are, in fact, set to use push and not fetch on the phone. What am I missing?