ITunes could not sync contacts to the iPhone because an error occurred

When I connect my iPhone to my iMac (OSX version 10.6.6), and open iTunes and select "sync" - everything syncs (my Apps, Music, Movies, TV Shows, Podcasts, books, Photos and Calendars). However, I get an error message popping up saying: "iTunes could not sync contacts to the iPhone because an error occurred while merging data".
I have unchecked the contacts button in iTunes and then sync works fine.
I have deleted all my contact in my Address Book on my iMac and tried to sync. Again, same error message as above.
I have not tried to restore the iPhone as I am worried to loose my contacts saved on my iPhone.
Who know how to solve this problem? Thanks

Hi Charlotte
I had the same problem for one year now and it affected my contacts, then later my calendar.
I followed the Apple troubleshooting guides and finally managed to make it work again.
First try the following guide:
iPhone, iPad, iPod touch: Troubleshooting contact and calendar syncing via USB on Window
http://support.apple.com/kb/HT1692
For me I noticed that after I updated ITunes to latest version (using the full uninstall from the last point of the guide above, section "Reinstall Apple Mobile Device Support and iTunes"), I could sync with another Windows user account (on another computer actually)
Since I wanted my own account to sync again, I then used the advanced troubleshooting guide:
Advanced troubleshooting for Sync Services on Windows with Microsoft Outlook 2003, Outlook 2007, or Outlook 2010
http://support.apple.com/kb/TS2776
In my case the point 4 in this guide helped, but since I had no MobileMe, I just killed the OS process SyncServer.exe, then renamed the SyncServices folder to SyncServices.old and restarted the PC.
You should try all the steps in both guides in the order mentioned, to see which one can help, I don't advise you to start directly with a step in a guide
Good luck
Iphone 4, iOS 4.3.3, Outlook 2007, Win 7 64Bit

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