Iphone 5 not syncing calendar with exchange

We have several iPhones in our organization - both 4S and 5. We are syncing them with Exchange Server 2003 and 2010 SP1. Email and Contacts sync fine, but the Calendar does not. Anyone have an idea on what we can try?
Thanks

Hmm ...238 views, and 14 people with the same question, but no replies?
I have spent the most frustrating 3 weeks trying everything suggested on every forum I could possibly find, and STILL I have not solved this
Everything has been deinstalled, reinstalled. Pst files have been backed up and recreated. etc etc
The only headway I seem to have made is to discover that when I create a new Outlook profile with a 'guest' account my phone will happily sync calendar with this profile, so what does that tell me? That it's a problem with my original Outlook user profile ? (If so, what should I now do?)
There seem to be so many people with the same problem - Outlook calendar suddenly not syncing - I can't believe someone hasn't identified the problem....
Please.......

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Hi Ricardo,
I couldn't go that far yet. Called the tech support in USA (I found out this forum is Europe) and they told me that my e71 is from Malaysia and my update software is from USA. Not know if this where the issues are. I delete all the entries in my calendar and try sync the calendar again. It stops right at the same place. Now my entries are totally gone.
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