Basically, the Zimbra to Gmail Converter tool can export Zimbra files to Gmail accounts, G Suite, Google Drive, PST, OLM, MBOX, MSG, EML, EMLX, PDF, HTML, etc. Also convert Zimbra files into Office 365 mailboxes and Online Exchange. These two formats are used for online conversion. Before scanning is complete, this tool shows a preview of the item.
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https://www.kdetools.com/zimbra/gmail/