iPhone not syncing with Exchange

Hi All,

I know that this issue is old and there seems to be a thousand "tricks" to fix it. Much finger pointing is involved. Please read the details of my issue before shunning me.

We are running Exchange 2010 with Outlook 2010 and the OWA. We have 4 iPhones running IOS 6.1.3. Identical phones. We also have about a dozen droid phones. (Yes, I know that droid uses OWA technology and the iPhone, activsync.

Outlook syncs properly with Exchange and with OWA. All droids sync properly. Only one iPhone does not. Yes, you guessed it, the Presidents... :(

His iPhone seems to sync the following properly:

*Calendar and Contacts

*When email is deleted on the iPhone, Outlook shows change
*When email is deleted in Outlook, iPhone shows change

*When email is flagged on the iPhone, Outlook shows change
*When email is flagged in Outlook, iPhone shows change

*When email is read on the iPhone, Outlook shows change
*When email is marked as unread on the iPhone, Outlook shows change

The exceptions:
*When email is marked read/unread in Outlook, the iPhone DOES NOT SHOW CHANGE.

I have re-installed Outlook on his pc, several times, nuked his iPhone several times. Rebuilding his account setting each time...

I thought it might be a Push issue to the iPhone, but, the iPhone updates when messages are deleted or flagged. If I flag an email that has been read/unread in Outlook and has not changed on the iPhone, the email will then show the correct read/unread choice once I flag/unflag it. This seems very odd to me. In my mind the flagging should not be working either. :confused:

I do not believe it is an Exchange issue because the other iPhones are working fine.

Any help would be appreciated.

Thank you!