You can use VartikaZimbra to PSTConverter to convert all Zimbra files to PST with attachments and solve the problem of how to export Zimbra files to PST Outlook. It can import Zimbra files from Windows Live Mail, Windows Mail, Outlook Express, and other email clients into Outlook, complete with metadata, formatting, photos, hyperlinks, and other features. It offers a free demo edition that allows you to convert 30 Zimbra files to Outlook for testing purposes.