This is not true, you can share something with the Zimbra Web Client (ZWC) and access it with Zimbra Connector for Outlook (ZCO).
To access contents that have been shared with you using ZCO do the following:
File->Open->Other users mailbox and select the user that has shared a folder with you.
On the next sync, you should then see a new folder tree that contains the mailbox and items that have been shared with you. |