Use a specialized application MacSonik OST Viewer Tool to view, convert, and read OST files without Outlook on Mac. With the help of this tool, you can export OST email ranges between specific dates. This software is capable of exporting and saving OST files into PDF, DOC, MBOX, and other file formats. It can Save OST into PST and split large PST files into smaller ones. Apart from this, it can quickly locate specific file items of large OST files on Mac.