Integrating with OSX

Hi all,

I have to integrate several OSX Mountain Lion Macs into our Groupwise enviroment. Mail already works fine via IMAP/SMTP, but there are several problems concerning calendar and addressbook. I am aware of the ActiveSync problem and looking for other possibilites. Is there a way to access the data in Groupwise via CalDAV and CardDAV? Data Synchronizer is deployed, if someone knows connectors ...

Thanks a lot!