IPhone 3G loses calendar entries on sync

I'm synching my Iphone 3G (software 2.1) over ITunes 8 with Outlook 2002 on a PC running XP.
Here's the problem: it syncs fine when there's a new entry on either the phone or the desktop, but if there's are new entries on both then the entry on the phone disappears completely - from both the phone and the computer.
In ITunes I have nothing checked under 'advanced' in info.

Humm, it sounds like it's set to update to the latest version, rather than synchronize. Under info, ensure that Calendars are set to Sync calendars with Outlook.
If it's already set to this (and it probaby is), try deselecting this, sync, restart both the computer and the phone, go back and reselect the option and try again.
I had a similar problem, and by ensuring that my laptop had the most recent data on it, then forcing it to overwrite the phone (Advanced section, as you noted in your message), and then resetting the sync as noted above it 'healed'.
Goo luck
coop

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IPhone calendar entries not synced with MacBook calendar

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When syncing Contacts or Calendars between an iPhone, iPad, or an iPod touch and Outlook 2003, Outlook 2007, or Outlook 2010, changes that you synced to your computer may not appear in Outlook even after the sync has been completed.Try this article to see if it works for you
http://support.apple.com/kb/TS1944
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What I finally did was to log into my icloud account online. I saw that all my contacts were properly synced from my MacBook Pro - so I unchecked "contacts" under iCloud preferences on my phone. Then I rechecked it and asked it to sync again. All the contacts from my MacBook Pro are now on my phone. Thanks for your help!

Since Mavericks update my iPhone and iPad calendars are NOT syncing with the calendar on my MacBook Pro

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I have temporarily solved the sync problem by using an older MBAir running snow leopard, I exported
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HT1349 My iPhone has duplicate calendar entries

My iphone has duplicate calendar entries what do I do to get rid of it and what did I do to get it , so i dont do that again!!!

Are you using iCloud? If so, go to Settings/iCloud and turn off Calendar. Select to delete the Calendar info. Wait a minute and then turn Calendar back on.

Existing Calendar Entries not Syncing to iCloud

I have an iPhone 5 running iOS 7 that has five calendars. I attempted to sync it to my iCloud account today and it only syncs one of my calendars ("Work"). The other calendars ("School", "Home" etc), show up in iCloud in the Calendars sidebar, but none of the entries do. If I create a new event on my phone in any of the calendars, they show up and sync perfectly to the iCloud and to my new MBA (running Mavericks). Likewise, events I create on my MBA and iCloud show up fine on my phone. So, why are these existing entries, for all but one of my existing calendars, not syncing? Any ideas?
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Randers4 wrote:
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Oh, I have a good feeling about this! I will try it out and report back in the morning. Thank you so much!

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This happened to me too and I think it has to do with your phone showing your calendars from your MobileMe and then all of them again from your computer. Go to your Calendar on your iPhone and hit the "Calendars" button top left and it should give you options to select "All Calendars" or "From My Mac" or "MobileMe". I ended up having "All Calendars" selected and it showed both, Computer & MobileMe at the same time so it looked like I doubled everything.
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Greetings,
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If you have the Calendar perfect in outlook follow this steps, after this you have the calendar perfect.
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I had the same issue with the disappearing calendar. I had my entire work and personal schedule on my iPhone.
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Double Contacts & Calendar Entries when Syncing PocketMac to Storm

To Forum
i know others have had this but i have not seen anyone have the issues sorted on any forums.
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This happened to me too and I think it has to do with your phone showing your calendars from your MobileMe and then all of them again from your computer. Go to your Calendar on your iPhone and hit the "Calendars" button top left and it should give you options to select "All Calendars" or "From My Mac" or "MobileMe". I ended up having "All Calendars" selected and it showed both, Computer & MobileMe at the same time so it looked like I doubled everything.
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IPhone 3G loses calendar entries on sync

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