Syncing calendar or contacts never ends...

Question

Love my iPhone, love my new Macbook Air.
First time I sync'ed the two my 600 contacts made it from the computer to the phone.
Now I'm syncing again a few days later and music syncs, video syncs, but if I choose to sync contacts or calendar it never ends. I've left it for as much as 30 minutes and nada.
No progress is shown as it is with music, etc -- just a barber-pole like progress bar that never changes.
I've tried checking the sync box that says "for this sync only replace the content on the phone" and it doesn't make a difference.
I've tried powering the phone down and back up and nothing.
I rather not completely reset the phone because I suspect that this will wipe the call logs, voicemails, SMS conversations, etc.
If it helps, I think the problem started because during this 2nd sync it detected a bunch of "conflicts" in the address book and asked which version I wanted to keep. I went through and chose all the ones to keep but before that sync was done the sync got hung up because an SMS message came in which it was in progress and when I tried to slide the slider to get to the SMS I killed the sync (I didn't realize the slider killed syncs at that point).
Any ideas?

Answer 1

Petestein1
One thing to try is to open isync from your applications folder.
Once isync is open, click on isync at the top of the screen and choose preferences.
In the preferences, reset sync history.
After sync history is reset, quit isync and try syncing the iphone again.
If the issue persists, try creating a new user account.
Log into the new account and open ical and address book.
Put a test contact into address boo and a test event into ical.
Then open itunes, go through the initial setup and try syncing just contacts and calendars.
Make sure to merge data.
If the sync goes on in the new user account, then some how the data has become corrupted in your account and is causing the sync to hang.
Hope this helps.