Large MSG files usually become tricky because they often contain heavy attachments, embedded images, or long email threads. When you try to convert them using basic drag-and-drop methods or manual export, there’s always a chance that formatting breaks or attachments go missing.
A simple free way is to open MSG files in Outlook and use “Save As” or drag them into a supported email client like Thunderbird after converting through import tools. But with big files, this process can be slow and sometimes incomplete, especially if there are multiple nested messages.
If you are dealing with a batch of large files, I’ve seen people use WholeClear MSG to EML Converter since it processes files in bulk and keeps attachments intact during conversion. Just make sure to test a few files first before running the full set.
