Stella Zimbra to office 365 converter software program converts all Zimbra mailbox items into pst file. This software program is designed to convert all Zimbra mailbox items into pst files using excellent conversion techniques. This software program supports all version 32bit and 64bit Zimbra documents. This software program converts all corrupted and unmounted Zimbra file data in to pst file.

For extra info go to this link.
https://www.stelladatarecovery.com/email-migration/zimbra-to-pst-converter.php