I thought I give it a 3rd try and use it. This time I backed up my Calendars before starting and thank God, I had to revert to my back up.
It is very annoying every sync will duplicate your events and to do list.
I went back to use Sync Entourage-iCal. It works all the time without a hitch. It is not as fancy as e2Sync but works flawlessly. also, Sync Entourage-iCal give you full control over the sync process a have a great report after every sync process. If you interested in syncing iCal and Entourage you should give it a try.