Follow the steps to understand the Zimbra Migration Tool
Export all items of Zimbra Mailbox into a TGZ archive.
Download & Install the zMigrator application in your system.
Load Zimbra Mailbox Folders in Application.
The software also provides Preview of Emails.
Choose Required format or switch to Contacts or Calendars tab.
Setup all the required Zimbra Conversion Options.
Users can also Change Destination Path
Click on Convert button & Analyze the Process.
Click on OK button to Exit from here.
Analyze SavingLog report after conversion.