Try stella zimbra to pst converter software convert all the zimbra file data in to pst file. stella zimbra to pst converter software support all the version of the zimbra file. zimbra to pst converter software convert all the tgz file data in to office 365 account. Stella zimbra to pst converter software convert 32bit and 64bit zimbra file data. Demo version of the software convert 25 emails each folder.

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 https://www.stelladatarecovery.com/email-migration/zimbra-to-pst-converter.php