You're searching for a valuable device to move Zimbra to PST, KDETools Zimbra to PST Converter is a decent decision.
• Move a variety of file types, such as PST, MBOX, MSG, EML, EMLX, PDF, and HTML, among others.
• Additionally, this tool export contacts and calendars from Zimbra into an Office 365 account.
• This application safely move corrupted files without losing any data.
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http://www.zimbra-converter.com/