HT1386 iPhone Syncing Calendar issues...

Hi All,
I've had a recent problem in that my iPhone 4S seemingly 'lost' a load of my Calendar entries. I checked that all the Calendars where being synced by selecting 'All calendars' and this was okay, but when i tried to Sync with iTunes, I got a message saying I'd delete over 800 entries on the Computer (the 'over 25% of entries being changed' warning) if I continued, so I 'cancelled sync' of the Calendar entries...
I next followed the support page recommendation, and on iTunes>(Device)>info>advanced, clicked on the 'Replace information on this iPhone - Calendar' box. Next Sync, all entries reappeared, but whenever I've tried to Sync since it tells me that if I proceed , I will 'MODIFY' over 350 entries on the computer - something I'm a little weary of doing! Is there any advice anyone can give as to where I've gone wrong / if I should just proceed, etc?
I'm running Windows 7, and the iTunes is up to date, as is the iOS on the iPhone 4S...
Thanks very much in advance for any help!
Kindest regards,
Mark

I have this same issue: When I add an event on my iphone, it does not show up on icloud.com - it worked fine in the past and I haven't changed any settings. I verified the icloud calendar settings on the phone (default calendar etc..) - I tried to turn calendar icloud sync off and then back on but to no avail. help.
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http://support.apple.com/kb/TS3920
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I have this same issue: When I add an event on my iphone, it does not show up on icloud.com - it worked fine in the past and I haven't changed any settings. I verified the icloud calendar settings on the phone (default calendar etc..) - I tried to turn calendar icloud sync off and then back on but to no avail. help.
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