Windows Contacts doesn't appear in sync ...

I run iTunes 9 on 64-bit Vista, and I want to back up the contacts from an iPhone so I can restore the iPhone and not lose all the contact information. I thought I'd sync the contacts to Windows Contacts, but in iTunes when I check the box to sync contacts, nothing appears in the drop-down list to the right. When I click the list nothing pops up at all, not even an empty list--the list control just doesn't respond to the click event.

I don't have Outlook on this machine, but Windows Contacts is built into Vista. Does anyone know what I might have to do to get Windows Contacts to appear as a sync option in iTunes?

thanks,
--Matt

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