You can use a commercial tool like KDETools Zimbra to Outlook PST Converter to import Zimbra to Outlook PST. A few highlights are:
• Other file formats, including MBOX, MSG, EML, EMLX, PDF, HTML, and others, can also be import using this tool from Zimbra to Outlook PST.
• It extracts every useful piece of mail data, including To, Bcc, Cc, Sent, From, Received, and Attachments, among others.
• Without losing any data, this software import Zimbra files to Outlook PST effortlessly.
• This software additionally support Windows Version.
More Details:
http://www.zimbra-converter.com/
