The well-known method to convert OST files to PST files while preserving email attributes and OST file folder structure is to download MacProTools  OST to PST Converter for Mac. The user may recover and convert OST files to PST format, including attachments. It is a multi-supported email software that can import the resulting PST file straight from the OST file and readily support all versions of Microsoft Outlook. It is Mac-compatible software that is simple to install on all Mac operating systems.