Sharepoint calendar sync with zimbra calendar?

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So unfortunately zimbra doesnt have a robust enough document manager like shareopoint yet, so we have to continue to use sharepoint for now. I only recently switched the client from regular pop3 mail to zimbra and its outlook connector. Is there anyway to sync a Zimbra calendar with a sharepoint calendar and have it work two way? They are currently on WSS 2.0, but im going to be migrating them to 3.0 or Foundation in the near future. I know 3.0 will do two way with outlook in general. BTW, all users are using Outlook and the Zimbra Outlook connector. At this point, no one is really using the webmail.