All Contacts and Calendars entries have disappreared

All my Contacts and Calendar entries have suddenly disappeared from my iPhone4S, and the phone won't allow me to make any new Calendar entries. I've tried restoring from a back-up on my PC, but I get a messsage on iTunes on the PC saying no back-up is stored there, although I'm looking at the iTunes screen telling me when the last back-up was made.
Any suggestions would be much appreciated.
TIA

I have the exact same problem and it drives me mad - thanks for letting me know if you find a solution. Here is what I will try: export all my contacts from where they are in the pst file in outlook then "try" to reimport them in the ost file (exchange). I noticed indeed that if I create a contact in the ost file, it does get pushed over to itunes.
But there seems to be no way of telling itunes which outlook data file to use in priority, and if you select it as default in outlook you wipe out the content of your mail file on the exchange server. Not great.

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I have the exact same problem and it drives me mad - thanks for letting me know if you find a solution. Here is what I will try: export all my contacts from where they are in the pst file in outlook then "try" to reimport them in the ost file (exchange). I noticed indeed that if I create a contact in the ost file, it does get pushed over to itunes.
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All Contacts and Calendars entries have disappreared

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