In Mac OS X 10.4 or later, you can sync contacts and calendars to your iPod with iSync 2.0. But you may notice that you cannot add iPod to iSync once the latest version of iTunes is installed. That’s because iTunes will take over these duties from iSync. Follow these steps to configure what contact and calendar information you want synced to your iPod:
If you are using Mac OS 10.4 or later but haven't upgraded to at least iTunes 4.8, you can continue using iSync to sync contacts and calendars to your iPod. Please note that iSync will not automatically launch when you connect your iPod. Instead, your information will sync to iPod in the background whenever you connect it.
If you are using Mac OS 10.3.9 or earlier, you cannot use iTunes to sync contacts and calendars to iPod.
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