[OR78]

When you sync with windows live it will sync your contact list. But when you also sync with your computer and select to sync your contacts, your settings have to be right in order for everything to sync right. I had this happen to me one time but it was operator error. Double check your settings. If you were wise, you would have Microsoft My Phone too. If you did, log onto My Phone and go to the archive section. You will have all your contacts deleted in there.