How to bulk transfer MSG files into Thunderbird mailbox?

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MSG files are Outlook-specific, so Thunderbird can’t open them directly. To import MSG files into Thunderbird you first need to convert them into a format Thunderbird supports such as MBOX. The easiest and most reliable way to do this is by using a professional tool like Softaken MSG to MBOX Converter. This software lets you convert multiple MSG files at once into a single MBOX file without losing data. It preserves all email properties, including attachments, metadata, formatting and folder hierarchy. The tool works with all versions of Windows and doesn’t require Outlook to be installed. It also includes a free trial version and technical support for users.