You can easily import Zimbra mail to Gmail account using professional software like KDETools Zimbra to Gmail Migration Tool. The software directly import Zimbra to Gmail, G Suite, Google Drive and etc. The application shows the preview of emails. The software also import Zimbra to numerous file formats such as PST, EML, MBOX, EMLX, HTML, NSF, PDF, OLM, and etc. The application supports all the latest versions of Windows.