Is there any simple solution to batch create OST file in Outlook on Mac OS? If you’re also searching for a solution to this question, then use a professional OST Converter for Mac Tool. It is an easy-to-use application to easily create OST file in Outlook on Mac OS without Outlook installation. The software can instantly create OST file in Outlook on Mac OS with complete details like attachments, emails, contacts, tasks, calendars, notes, etc. A free trial edition of Mac OST Converter can be downloaded on all Macintosh OS machines and tested for its efficiency. A free trial version will permit you to create the first 25 OST items per folder in PST format without paying any charge.