Migrating opensource Zimbra 8.6.0 on Centos 6.8 to Zimbra 8.7.1 on Centos 7 safely and with no downtime !

Zimbra to Zimbra (zcs to zcs) migration A bit of history for the context After running a Zimbra mail server in a 500Gb Virtual Machine, for about 4 years, the server started feeling a bit crowded and with  #df -h reporting less than 50Gb of space left, it was time to move to a larger machine. The version I was (and still am) running is the open source version, there are no migration tools available as part of the package, although you

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