As explained in many posts, you can not migrate a ispconfig 2 server to ispconfig 3. This means if you want to use a ispconfig 3 server for your sites, you will have to create all sites and user accounts in ispconfig 3 manually. Mail accounts can not be moved directly, you can just try to copy the maildir files of every account and fiolder manually to the new locations on the new server and dont forget to chnage all owb´nerships to the vmail user.
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