If you're new to Zimbra Desktop, I recommend eSoftTools Outlook PST Recovery Software for easily importing Outlook PST files Zimbra Desktop. It can easily restore Outlook PST files. You may also get the Split option with this software, which is useful for us. There is also a free trial version available. You can only retrieve 25 emails per folder in the trial edition.
Read more:- Import Outlook PST File to Zimbra Dekstop