iPhones not working with Exchange 2010

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!
ricjenkinsNetwork AdminAsked:
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tsaicoCommented:
I had a few users that had a similar effect when doing a migration (in our case, it was SBS Exchange 2007 to 2013, and another from SBS 2003 to SBS 2007). Ran around trying to figure it out and couldn't see anyhting.  Did the same delete account on phone, add again, delete from OWA, then from device, etc. For some reason, some of the AD schema wasn't updated correctly and the "inherit permissions" wasn't set for some reason.  It is also possible it might be an SBS issue or Windows 2008 RTM (not R2) type of problem.
http://eightwone.com/2011/08/31/exchange-activesync-and-inheritable-permissions-issue/

Also, if for some reason, you have more than 10 device relationships, it will also not work.  Just delete a few device relationships for that user and then delete the account on device and try again, either from the GUI or the user's OWA
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Kyle SantosCustomer RelationsCommented:

1.

If you have used the same credentials, for example on another phone prior to the iPhone, they are probably still cached in the Exchange server, and the default number of devices allowed by Exchange Server is 10, some organizations make that fewer.

If you have access to the Exchange/Outlook Web Access: log in and go to Options > See All Options > Phone.
You should see a list of devices that have been setup with that email account, delete any unneeded ones.

2.

Also, if active sync is not enabled connection will not also establish from phone to server.  Try to remove the account from the device and then restart and reconfigure the account.

You can open up the EMC (Exchange Management Console).  

Go to Recipient Configuration > Mailbox

Right-click the Mailbox for the user and select properties

Click on Mailbox Features Tab

Should be able to see everything that is enabled for the user (POP, MAPI, Archive, OWA, ActiveSync)
Source

Let us know if that works or not.
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AmitIT ArchitectCommented:
Goto exrca.com and test activesync from exrca.com for same user. Check the result. That will tell you, why it is failing.
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ricjenkinsNetwork AdminAuthor Commented:
The inherited permissions ended up being the issue! And, Amit, that's a great testing site, so thanks a ton for that! Thanks for all the input, everyone!

Now on to phase 2 of our dual-swing Exchange migration!
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AmitIT ArchitectCommented:
Great :)
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