To
import Zimbra to Thunderbird with all folders intact, you first need to convert the Zimbra mailbox file (TGZ) into MBOX format, because Thunderbird supports MBOX files but cannot open TGZ files directly. During the conversion process, it is important to choose a method that preserves the original folder hierarchy so that emails remain organized in the same structure after migration.
Many users handle this by using a conversion utility such as
SysInfo Zimbra Converter, which allows TGZ files to be converted into MBOX while maintaining the original folder structure, emails, and attachments. The process usually involves adding the TGZ file to the tool, previewing the mailbox folders, selecting MBOX as the output format, and starting the conversion.
After the conversion is completed, the generated MBOX file can be imported into Thunderbird using its import option. Once the file is loaded, all Zimbra emails and folders appear in Thunderbird in the same hierarchy as the original mailbox, allowing users to access their data without losing organization.
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