I have several MBOX files exported from my old email client, and now I need to import them into Zimbra. Since Zimbra supports TGZ format, I am looking for a simple and reliable way to convert MBOX to TGZ without losing any emails or attachments. I tried searching online, but I am confused by the different suggestions. Some methods look too technical, and I do not want to risk corrupting my data. Can anyone please suggest an easy method or any tool that can directly convert MBOX files to TGZ format?