There is a great tool called
Softaken MBOX to PST Converter that can help you safely move a lot of MBOX emails to Outlook without losing any info. It is true that conversion by Manual can be dangerous and difficult, and files often get damaged or data is lost. But it saves everything about your emails, like attachments, metadata, and the structure of your folders.
There isn't much to it, so even people who aren't tech-savvy can quickly convert MBOX files. As a result, it can convert multiple MBOX files at once, which saves time. It also keeps the layout of emails the same and works with all versions of Outlook. You can also look at emails in the program before converting them to make sure everything is still the same.
In general, MBOX to PST Converter works well, is safe, and is ideal for people who want to move their emails from Thunderbird, Apple Mail, or other MBOX-based apps to Outlook.