We use Microsoft Exchange Enterprise 2010 and Active Synch to connect to numerous Apple Mobile devices, including iPads and iPhones. We upgraded many iPad 3s and iPhone 3G, 4, and 4S's to iOS 6 and have had no problems with push mail on these iOS 6 devices. However, we now have 10 iPhone 5s (4G, LTE, and 3G CDMA carriers) that have consistent problems with ActiveSynch push mail. It stops pushing mail within minutes to days after adding the Exchange account. We've deleted old device partnerships and followed the general troubleshooting tips from Microsoft and Apple to no avail. We even tried replacement iPhone 5s, which are still afflicted with this problem. The problem is also not listed as a "current" issue on the Microsoft Known Issues with ActiveSynch page.
The community forums in Apple and news articles on the web seem to indicate this is a pandemic problem with iOS 6, although we've only seen it on the new iPhone 5. Has anyone else had this problem and any luck resolving it?
https://discussions.apple.com/thread/4345374?start=0&tstart=0
We have reports in to Apple Enterprise and they are investigating (they've had this for weeks). No word on the problem's status yet. We've got thousands of iPhones out there and have stopped any rollout of the iPhone 5.