Calendar modify by an attendant problem

Hi ,

I've got a problem with ceo calendar update via active sync.

Everything works fine if a new appointment is inserted on the ceo's calendar by his secretary.

 (she has editor pemission on the calendar). If Ceo's secretary changes an existing appointament modification aren't replicated on ceo Iphone.

I checked IIS log without notice someting strange.

Also check didn't show any issue.

What are the further troubleshooting that I can take to investigate the issue

Thanks a lot 

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Luca Pozzoli