IPhone sync to exchange server calendar does not sync any longer, mail is no problem.

Hi we are running Exchange 2003 and we suddenly discovered some users now cant get their calendar to sync. If we add anything in outlook it wont show up in the iphone and it is the same the other way around.
We done total reset on the phone, switched the phone to a htc mini and tried that same problem there the calendar does not sync. this is only happening for about 5 users out of 150 users. I have tried reset the profile in outlook.
I dont know where to start looking to solve this issue.  Hope anyone can shed some light here

Hi,
Please try to collect IIS log and then use "activesync" as keyword to have a search.
Also we can use logparser to analyze the log.
http://technet.microsoft.com/en-us/scriptcenter/dd919274
Besides, please try to test if the issue would occur when we use those problematic iphone to sync with working user's mailbox.
Xiu Zhang
TechNet Community Support

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