We have recently installed a new Exchange 2010 server (step 1 of a dual swing migration) and some of the iPhones are not working with ActiveSync. I know all of the settings are correct, as they've been redone, carefully, several times. We have some iPhones that work, and some that don't, when they're identical in iOS versions, etc. It's affecting all versions of iPhones: 6 and 5/5s. ActiveSync is enabled on all accounts, and it's not a permissions issue, that I can find. I'm just pulling my hair out on this, as I've tried everything I can think of! And I've deleted and recreated profiles, on the phones many times, too. Nothing helps. On my phone (a 6) it gives me all of the check marks when I finish the settings, manually, but I still cannot get email to do anything... Any ideas?? Thanks!