Zimbra to PST converter tool basically import Zimbra files to PST, and other file formats such as OLM, MBOX, MSG, EML, EMLX, PDF, HTML, etc. And also import Zimbra file into Office 365 mailbox and Exchange server this two format use for online Conversion. This application also shows preview item before completing scanning process.
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https://www.kdetools.com/zimbra/