This software will help you to convert emails from OST to PST file format. You can use this free Mac OST to PST Converter software, this software will help you to convert emails from OST file to PST file format. This is a free tool to convert your all emails from OST file to PST file. The free trial version which transfers the first 10 items from each folder.

Visit here:- https://www.toolscrunch.com/mac-ost-to-pst-converter.html

This software will help you to convert emails from OST to PST file format. There are multiple solutions available for converting Mac OST file to PST file format. You can google this solution. Last time I used a solution for the same issue and got a great result with this Mac OST to PST Converter tool. I will recommend you to download this Mac OST to PST software. The free trial version which transfers the first 10 items from each folder. 

More info:- https://www.toolscrunch.com/mac-ost-to-pst-converter.html