When it comes about email management and email migration, I always prefer manual tricks over paid software. For example: I'm using Apple Mail, but now I'm switching to Windows platform where I'll be using Windows Outlook. MBOX to PST conversion will be needed for this. Luckily, there's an easy manual trick to transfer emails from MBOX files to Outlook. It doesn't require any paid solution.
MBOX to PST Manual Conversion – An Easy Tutorial | N. Sem's Blog
In the above blog post, you can find the complete information on MBOX to PST conversion manually. You must try it before you can purchase any paid software. But if the manual trick fails or doesn't work, you should use a professional solution. Downlaod free demo version of MBOX to PST Converter software to convert MBOX files into PST format even if they are corrupt. By using demo version, you can save first 25 email items of each selected MBOX files.
I hope the shared information would be helpful here.