"the iphone could not be synced because the sync session failed to start" error!

I have been having all manner of problems synching my iPhone 4s; attempting to synch gets the dreaded ..."session failed"; synch appears to happen but doesn't; synch causes iTunes to hang requiring a force-quit etc etc.
This has been going on for months & has been driving me insane. Only happens with this one phone, not our other iDevices.
I tried every bit of trobleshooting advice I could find & nothing was working so I finally went to see a Genius at my local.
He was totally mystified so after 1/2 an hour of discussion he replaced my phone with a new one thinking it must be some weird hardware fault.
I plug the new phone in &... same problems.
I then started to try & isolate every posible cause.
I totally reinstalled iTunes, that didn't work. I removed all .plist files etc, that didn't work. So I started digging around in the iTunes files that hang around in the library folder & one by one I quarantined them, restarted iTunes, tried to synch etc etc.
Finally I struck gold!
I isolated the file iTunes Library Extras.itdb and on restart this file respawned & synch started instantly & finished perfectly.
So in short... if you are having this problem try moving this file elsewhere and then restarting iTunes & your synch to see what happens!

The way I fixed this (though I'm using a iTouch 4G): disconnect your iPhone from the computer, shut down iTunes, then reset your iPhone by holding the Power/Sleep & Home buttons together for 10 seconds. Restart iTunes, then when your iPhone restarts, reconnect it to the computer, and everything should work fine

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