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You can migrate the data from OST file format to Outlook PST format simply by using a third-party application like vMail OST to PST Converter for Mac software which is the data secured option to migrate the data. It also helps in restoring the data file and makes the conversion possibly done by this software. This software easily and flatly exports all email items like emails, attachments, etc. This software supports all MS Outlook versions like 2019, 2016, 2013, 2010, 2007, and 2003. It also supports all Mac OS versions. Go ahead and download the free Demo version software.

Get more info- https://www.vsoftware.org/blog/how-to-split-ost-file.html