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The manual migration Steps can be divided into the following:

Step 1: Export and Save Zimbra Emails in EML Format
Following the below-mentioned Steps will let you save Zimbra mailbox items directly to EML format on your system:

Launch Zimbra desktop client and click on the Preferences tab.Launch Zimbra desktop client
Now, from the left pane, choose Import/Export.choose Import/Export option
From the export panel choose All Folders.Select all folders
At this point, you can either select any individual mailbox item or the whole mailbox. Click OK to proceed.Select either single mailbox item or whole mailbox
Click on Export to begin the process.Click on Export to start procedure
Next, provide the destination to save the mailbox items.
The exported items are compressed in a ZIP file and are required to be unzipped. Use proper tools like WinZip/ WinRAR to unzip the file.
Next, check the extension of the unzipped mailbox items. At present, Zimbra only allows EML format for exporting the mailbox files.Check the extension of the unzipped mailbox

Step 2: Migrate EML Files to Outlook
EML files can easily be accessed with Outlook desktop client anytime.

Access EML file
Hence, it seems like overkill, but it is possible to migrate EML files to your Outlook desktop client.

Open your Outlook desktop client and select the Folder tab from the ribbon. Next, click on the New Folder tab.Click on the new folder tab
Provide a new name for the folder.Provide a new name for the folder
One can now directly drag and drop all the EML mails into this folder.Drag and drop all EML mails to folder.

Step 3: Export Zimbra Emails from Outlook to PST Files
It is now possible to export the Zimbra emails (from Outlook) as a PST file to your system.

Click to the File tab > select Open & Export from the left pane.
Click on the Import & Export tab. This will open up Import and Export Wizard. From the list, select Export to a file.
Next, select Outlook Data File (.pst) option.
Select the folder containing the Zimbra backup files.
Click on the Browse button to save the file to the desired location.Save the file to hard drive
Check the prior assigned location for the saved PST file.Check the prior assigned location for PST
Congratulations! You have successfully exported your Zimbra backup files to hard drive in a PST format.