If you want to export Zimbra file to Office 365 file format you can use any specialized tool like KDETools Zimbra to Office 365 Converter tool. It is the safe tool which can capably export Zimbra file to Exchange server and additional file format such as PST, EML, EMLX, HTML, PDF and etc. This software supports batch migration at once. This tool has many advanced features like quick conversion of data, corrupted file also converted securely etc. This tool is also supports all versions of MS Outlook & Windows.
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https://www.kdetools.com/zimbra/office-365.html
