When you're dealing with a large batch of MSG files, the main worry is usually not just conversion, but whether the emails will still look the same after moving to EML.
This problem happens because MSG files are tightly linked with Outlook and when you shift them to another format, some basic tools don't read headers, formatting, or attachments properly. That's when emails start looking broken or incomplete.
If the count is small, you can open MSG files one by one and drag them into Thunderbird or use a simple "Save As" option if Outlook is available. It works, but honestly it becomes slow very quickly and is not practical for bulk files.
For large folders, people often use Softaken MSG to EML Converter. It processes multiple MSG files together and keeps email structure, like subject lines, attachments, and layout, in a readable form.
One thing I've noticed is it helps to keep MSG files grouped in folders before starting; it gets confusing while checking output later.
