This is the method to utilise if you wish to import OST files into Zimbra Desktop without erasing any data. Try the most well-liked and efficient app, MacProTools  OST to PST Converter for Mac. This utility allows users to convert all Outlook OST emails to a variety of different formats, including Zimbra Desktop, PST, EML, EMLX, MSG, MBOX, Thunderbird, Gmail, Yahoo Mail, and Office 365. Both technical and non-technical users can utilise this application because it is easy to use. because to its clever user interface.