If you want to Import OST file into Zimbra formats then I would recommend you this eSoftTools OST to Zimbra Converter Tool, it can easily convert unlimited OST files into Zimbra files and also many more other file formats. Before making the conversion it can repair harm OST file data with all OST mailbox properties such as attachments, appointments, contacts, journals, chats, messages, etc. you can access this software in all MS Outlook versions.
Get Know More:- OST to Zimbra Converter Tool
Get Know More:- OST to Zimbra Converter Tool