If you are looking for helpful tool to transfer Zimbra file to Office 365, then you can use Zimbra to Office 365 Converter.
• This application transfer Zimbra file to Office 365 and additional file format such as PST, MBOX, EML, EMLX, HTML, PDF and etc.
• This application also support direct migrate of Zimbra to Office 365 account.
• You can easily set off this software in all versions of Windows such as 7, 8 and 8.1, XP, 10 and etc.
• This tool securely transfer Corrupted file.
Read More: https://www.kdetools.com/zimbra/office-365.html