I am currently looking for a reliable and hassle-free way to convert my MBOX files into Zimbra-compatible TGZ format. I have several MBOX files exported from a different email client, and I need to import them into Zimbra without losing folder structure, attachments, or metadata. I have tried a couple of manual approaches, but they either fail to maintain formatting or take too long. Is there any smooth and efficient method or tool that can perform MBOX to Zimbra TGZ conversion without data loss?