I was facing the same situation when I needed to move a big collection of EML files into MBOX format. Trying to do it manually was frustrating—files were getting mixed up, and it took way too long. After some searching and testing, I switched to
Toolsbaer EML to MBOX converter. This tool allowed me to add all EML files at once and convert them in bulk, instead of handling emails one by one. The folder structure and attachments stayed the same after conversion. This tool offers a simple and easy interface and doesn’t require any technical knowledge. This tool offers long-term storage and many relevant features like a preview option, selective export, and many more, which make it a suitable conversion tool.
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https://www.toolsbaer.com/eml-to-mbox-conversion/
