Do you have Zimbra Network Edition with a Professional license? If so, you may have luck using the Zimbra iSync connector.
You could also try CardDav, although I have limited experience with that.
Another option is to export your Address Book contacts in .vcf format and then import them under Preferences > Import/Export.
I can't say which of these options will best retain tags and values. I use NE with iSync connector, myself, but I've always used Address Book in conjunction with Zimbra. |