When there are hundreds or thousands of MBOX emails to move into Outlook, converting each mailbox separately can quickly become a tedious job. The important part is finding a converter that can handle multiple MBOX files in one run and gives you control over how the resulting PST files are created.
Before starting a bulk migration, I would check these points:
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Multiple MBOX files: The software should allow several MBOX files to be selected together.
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PST organization: Check whether you can merge multiple MBOX files into one PST or create a separate PST for each mailbox.
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Selective migration: Being able to choose particular MBOX files is useful when the archive contains mailboxes that do not need to be transferred.
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Mailbox data: Check what the conversion carries over, including folders, emails and their properties.
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Output review: Always open the converted PST in Outlook and inspect a few folders and messages before converting the complete collection.
If I were to migrate MBOX files in bulk, I would consider GainTools MBOX to PST Converter. The software allows batch selection, enables you to generate one PST from multiple MBOX files or separate PST files and provides a trial that will convert 10 emails from each MBOX. This allows us to test some real archive files before transferring the entire collection.
If it is a large mailbox archive, I would run the trial first, check the resulting PST in Outlook and then proceed to full migration if the output matches the expected mailbox structure.