You can also try MacMister OST to PST Converter Tool to convert single or multiple OST files to PST format on Mac OS without losing single info. It is a more effective and reliable tool according to other tools. The software comes with the free trial version which converts the 25 items from each mailbox. Blog Link - https://www.macmister.com/blog/convert-ost-to-pst-without-outlook/ Website Link- https://www.macmister.com/ost/

I would like to advise CubexSoft OST to PST Converter Tool to migrate OST files to PST in Outlook 2021, 2019, 2016, and other versions. The software migrates OST files with original properties to PST. It exports multiple OST files along with attachments to PST file format with all emails, contacts, calendars, etc. The app completes the migration procedure without any difficulty. Try trial version of OST to PST Converter to check the reality of the utility. To know more info, click here - https://www.cubexsoft.com/ost/pst.html

OST to PST is a professional conversion tool that effectively works for OST to PST conversion as well as to EML, MSG, Office 365 personal & live exchange server. It can easily work with multiple OST files and can easily recover corrupt item without making changes to item properties. I recommend using the Shoviv OST to PST Converter Tool for handling the OST files easily and effectively because of the following reasons – It has easy to navigate interface and supports multiple OST files at a time, and also, it is able to recover all corrupted items without changing their properties or format. To know more- https://www.shoviv.com/ost-to-pst-converter.html