If you find the tgz to pst converter software try stella tgz to pst converter software to convert all the zimbra tgz file data in to pst file. stella zimbra to pst converter software support all version 32bit and 64bit tgz file. stella tgz to pst converter software convert all the zimbra file data into office 365 account. Stella zimbra to pst converter software convert all corrupted and unmounted zimbra file data in to pst file.

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