How to save OST file Outlook in Outlook on Mac OS? Download and install OST Converter for Mac Software and successfully save OST file Outlook in Outlook on Mac OS without facing any issue. The program allows users to batch save OST file Outlook in Outlook on Mac in a single round. The Mac OST to PST Converter keeps the complete folder structure and data hierarchy of OST emails without any changes or loss. Download Free OST to PST for Mac Tool on any macOS and Win OS platform to check the software functioning and performance.