Guide below is tested against zimbra 8.6, 8.7, 8.8. It’s not a full zimbra to zimbra migration, missed some things, but it works to migrating most important stuff. There might also exist some minor bugs, but if you have a basic experience in linux shell you won’t have a problem tweaking commands.
There’s also this link provided by zimbra official wiki, but it’s not at all tested by our team:
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