Welcome to the forums,
Have you tried the Zimbra PST Import Wizard for email messages, attachments, contacts, calendars, tasks, and personal distribution lists? (Don't think rules & notes are currently migrated with that tool however.)
Visit your admin console downloads section (looks like a magic wand) or point your browser to: http:// server.domain.com/downloads/index.html
More info can be found in the documentation at:
/docs/ne/latest/import_wizard_for_outlook_guide/
(Don't forget about the MaxAttachSizeMB which is defaulted to 10MB or the ErrorThreshold if you would like to continue on past 3 errors - HKCU\Software\Zimbra)