To convert all of the contents of Exchange or import OST files into Zimbra, use MacProTools  OST to PST Converter for Mac. Thanks to the solution, you can import OST files into the Zimbra desktop email client. After downloading the trial edition, you can utilize the OST to Zimbra converter for free. A fully working version of this is offered at a reasonable price. This functionality can easily be included in even the most outdated Mac versions. Before buying a license, make use of the software's free trial.