Import Windows Live Mail to Office 365
You can quickly import Windows Live Mail to Office 365 without using Outlook. I recommend the Third-party software that name is eSoftTools Windows Live Mail Converter. This software securely converts Windows Live Mail single and multiple files to others formats. The tool enables the user to instantly import Windows Live Mail to Office 365, PST, MSG, EMLX, MBOX, MHTML and, HTML, etc. It can operate with all versions of MS Outlook and Windows versions up to 10.
Get more info- https://www.esofttools.com/blog/import-windows-live-mail-into-office-365/

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smithjens commented
You can also try Advik Windows Live Mail Converter which can easily migrate Windows Live Mail to Office 365. The tool is completely safe to use and doesn’t harm your data in any way. It works on all versions of Windows OS and supports all editions of Windows Live Mail data files. It’s also compatible with all Microsoft 365/Office 365 account types. If you want to test it before buying, there's a free demo version that allows you to export a limited number of emails. This way, you can see how the tool works before going for the full version.
Learn More: https://www.adviksoft.com/blog/migrate-windows-live-mail-to-office-365/