ISPConfig 2 and 3 use a completely different server setup (Linux system users vs. virtual users). The username in ISPConfig 3 is the email address of the email account and not a separate username, but there is a fallback mode in ISPConfig 3 to use separate usernames though.
It might be possible to develop import scripts for the email addresses as ispconfig 3 has a remote API, but I'am not aware of existing scripts for that purpose.
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